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PMID:12122 | Frequency of Y-chromatin bearing spermatozoa in intracervical and intrauterine postcoital tests. | By means of the intracervical Sims-Huhner-test and supplementary to this, the intrauterine postcoital test, the percentages of Y-chromatin-positive spermatozoa was determined after penetration into the cervix and the cavum uteri. A significant rise of the Y-positive sperms after penetration could be observed. There was no influence of certain parameters of the spermiogram upon the relationship of X- to Y-sperms after the PCT. Statistical calculations show the dependences of the positive and negative postcoital tests upon the individual parameters of the cervical factors and the spermiogram. | Frequency of Y-chromatin bearing spermatozoa in intracervical and intrauterine postcoital tests. By means of the intracervical Sims-Huhner-test and supplementary to this, the intrauterine postcoital test, the percentages of Y-chromatin-positive spermatozoa was determined after penetration into the cervix and the cavum uteri. A significant rise of the Y-positive sperms after penetration could be observed. There was no influence of certain parameters of the spermiogram upon the relationship of X- to Y-sperms after the PCT. Statistical calculations show the dependences of the positive and negative postcoital tests upon the individual parameters of the cervical factors and the spermiogram. | [
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PMID:12123 | Tubal pregnancy in Nigerian Igbos. | Fifty cases of excised tubal pregnancy which occurred in the Igbos of Nigeria are reviewed. Twenty percent of the tubes were unruptured at the time of excision, indicating a high level of awareness of the condition among local doctors. There were several pointers to the conclusion that, in this ethnic group, tubal pregnancy tends to be seen at an advanced stage. It also tends to occur in the younger women, to manifest during the first known pregnancy, to recur, and to be associated with salpingitis. Interstitial tubal pregnancy is also probably relatively common. | Tubal pregnancy in Nigerian Igbos. Fifty cases of excised tubal pregnancy which occurred in the Igbos of Nigeria are reviewed. Twenty percent of the tubes were unruptured at the time of excision, indicating a high level of awareness of the condition among local doctors. There were several pointers to the conclusion that, in this ethnic group, tubal pregnancy tends to be seen at an advanced stage. It also tends to occur in the younger women, to manifest during the first known pregnancy, to recur, and to be associated with salpingitis. Interstitial tubal pregnancy is also probably relatively common. | [
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|
PMID:12124 | The necessity for bilateral biopsy in oligo- and azospermia. | The 384 testicles from 192 infertile men were examined by bilateral biopsy. The main reason of this investigation was to see whether differences in the varying degrees of damage to the seminal epithelium existed in both testicles. Depending on the damage, the material was divided into five groups. The conclusion is, that the greater the degree of damage, the greater are the differences in the findings in both testicles. The left testis was more often and more strongly damaged than the right. | The necessity for bilateral biopsy in oligo- and azospermia. The 384 testicles from 192 infertile men were examined by bilateral biopsy. The main reason of this investigation was to see whether differences in the varying degrees of damage to the seminal epithelium existed in both testicles. Depending on the damage, the material was divided into five groups. The conclusion is, that the greater the degree of damage, the greater are the differences in the findings in both testicles. The left testis was more often and more strongly damaged than the right. | [
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|
PMID:12130 | Alterations in the coronary circulation of man following ascent to 3,100 m altitude. | Alterations in coronary blood flow associated with adaptation to high altitude were examined. Three normal men native to low altitude were studied, first at sea level, and again after 10 days' sojourn at 3,100 m altitude. During rest at high altitude, a 32% decrease in coronary blood flow was largely offset by a 28% increase in coronary arterial O2 extraction to maintain myocardial O2 delivery. The increase in O2 extraction resulted mainly from a decrease in coronary sinus blood O2 content and saturation. However, coronary sinus O2 tension remained constant, implying a decrease in the affinity of hemoglobin for O2. These observations are consistent with the hypothesis that coronary blood flow is regulated to maintain constant myocardial tissue O2 tension (as reflected here by coronary sinus blood O2 tension). The absence of a decrease in coronary sinus O2 tension or a decrease in myocardial lactate extraction imply that myocardial hypoxia did not develop. Therefore, myocardial hypoxia is not the basis for the decrease in cardiac stroke volume at high altitude reported previously and also observed in the present study. | Alterations in the coronary circulation of man following ascent to 3,100 m altitude. Alterations in coronary blood flow associated with adaptation to high altitude were examined. Three normal men native to low altitude were studied, first at sea level, and again after 10 days' sojourn at 3,100 m altitude. During rest at high altitude, a 32% decrease in coronary blood flow was largely offset by a 28% increase in coronary arterial O2 extraction to maintain myocardial O2 delivery. The increase in O2 extraction resulted mainly from a decrease in coronary sinus blood O2 content and saturation. However, coronary sinus O2 tension remained constant, implying a decrease in the affinity of hemoglobin for O2. These observations are consistent with the hypothesis that coronary blood flow is regulated to maintain constant myocardial tissue O2 tension (as reflected here by coronary sinus blood O2 tension). The absence of a decrease in coronary sinus O2 tension or a decrease in myocardial lactate extraction imply that myocardial hypoxia did not develop. Therefore, myocardial hypoxia is not the basis for the decrease in cardiac stroke volume at high altitude reported previously and also observed in the present study. | [
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|
PMID:12127 | Reduced red cell membrane potential and acidification of the plasma in response to contrast materials. Time course of the alteration in plasma pH. | Radiographic contrast materials added to blood reduce the red cell membrane potential by balancing the internal impenetrable anions, hemoglobin and organic phosphates. In so doing, a redistribution of protons occurs such that plasma is acidified. The time course of acidification of plasma is measured in seconds, with a nadir of pH occurring 12 to 15 seconds after addition of Hypaque (1.5 to 3.0 ml/10 ml blood) and a half-time of acidification requiring about 6 seconds. The acidification process is slowed in part by an initial alkalosis due to Hypaque. The acidification of blood is more rapid after addition of Renografin (1.5 to 3.0 ml/10 ml blood) than after addition of Hypaque since the former solution is slightly acidic. The time course of plasma acidification indicates that a maximal reduction in blood pH may not occur in the capillaries of a regional circulation following injection of contrast materials into its afferent vessel, since the transit time of the contrast material may be less than the time required for maximal acidification of plasma. | Reduced red cell membrane potential and acidification of the plasma in response to contrast materials. Time course of the alteration in plasma pH. Radiographic contrast materials added to blood reduce the red cell membrane potential by balancing the internal impenetrable anions, hemoglobin and organic phosphates. In so doing, a redistribution of protons occurs such that plasma is acidified. The time course of acidification of plasma is measured in seconds, with a nadir of pH occurring 12 to 15 seconds after addition of Hypaque (1.5 to 3.0 ml/10 ml blood) and a half-time of acidification requiring about 6 seconds. The acidification process is slowed in part by an initial alkalosis due to Hypaque. The acidification of blood is more rapid after addition of Renografin (1.5 to 3.0 ml/10 ml blood) than after addition of Hypaque since the former solution is slightly acidic. The time course of plasma acidification indicates that a maximal reduction in blood pH may not occur in the capillaries of a regional circulation following injection of contrast materials into its afferent vessel, since the transit time of the contrast material may be less than the time required for maximal acidification of plasma. | [
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|
PMID:12131 | Ventilation in conscious dogs during acute and chronic hypercapnia. | Minute ventilation was measured in conscious dogs, at rest and during exercise (1 mph), over 60 min immediately following the acute inhalation of 5% carbon dioxide in air and at 2, 4, 7, and 14 days while breathing the same gas mixture in a chamber. The dogs were also studied in the immediate period of air recovery from chronic hypercapnia and 1 day later. Control studies were carried out with the dogs breathing air in the chamber under comparable conditions. A triphasic ventilation change was ovserved in dogs at rest over the 14 days of hypercapnia. After an initial marked increase in ventilation during acute hypercapnia, ventilation returned to control levels by 2 days and then appeared to be elevated above control studies from 4 to 14 days at a time when blood acid-base balance became compensated. When the same dogs were studied during exercise, ventilation was also not different from air control at 2 days of hypercapnia; however during exercise, unlike the resting studies, there was only a tendency for a secondary increase in ventilation at 7 and 14 days of hypercapnia. During the immediate recovery from chronic hypercapnia when the dogs breathed air there was no evidence of hypoventilation either at rest or exercise despite arterial alkalosis. At 24 h of recovery it appeared that dogs while at rest had a slightly reduced ventilatory response to 5% carbon dioxide relative to control studies. The findings provide suggestive evidence that other factors, in addition to acid-base balance, might contribute to the regulation of ventilation during chronic hypercapnia and the recovery from chronic hypercapnia. | Ventilation in conscious dogs during acute and chronic hypercapnia. Minute ventilation was measured in conscious dogs, at rest and during exercise (1 mph), over 60 min immediately following the acute inhalation of 5% carbon dioxide in air and at 2, 4, 7, and 14 days while breathing the same gas mixture in a chamber. The dogs were also studied in the immediate period of air recovery from chronic hypercapnia and 1 day later. Control studies were carried out with the dogs breathing air in the chamber under comparable conditions. A triphasic ventilation change was ovserved in dogs at rest over the 14 days of hypercapnia. After an initial marked increase in ventilation during acute hypercapnia, ventilation returned to control levels by 2 days and then appeared to be elevated above control studies from 4 to 14 days at a time when blood acid-base balance became compensated. When the same dogs were studied during exercise, ventilation was also not different from air control at 2 days of hypercapnia; however during exercise, unlike the resting studies, there was only a tendency for a secondary increase in ventilation at 7 and 14 days of hypercapnia. During the immediate recovery from chronic hypercapnia when the dogs breathed air there was no evidence of hypoventilation either at rest or exercise despite arterial alkalosis. At 24 h of recovery it appeared that dogs while at rest had a slightly reduced ventilatory response to 5% carbon dioxide relative to control studies. The findings provide suggestive evidence that other factors, in addition to acid-base balance, might contribute to the regulation of ventilation during chronic hypercapnia and the recovery from chronic hypercapnia. | [
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|
PMID:12128 | Electrophoretic properties of temperature-sensitive mutant particles of simian virus 40. | Forty-five temperature-sensitive strains of simian virus 40 (SV40) particles belonging to four complementation groups were analyzed by agarose gel electrophoresis. Five strains (B204, B218, B233, and BC226), which are members of the B and BC complementation groups, yielded virions with aberrant mobilities. Genetic mapping by LAI and NATHANS suggested that B and BC mutantions are in a single gene. The mutant virions possessing altered mobilities have greater positive charges than wild-type particles. The findings presented here indicate that the product of gene B and BC is a significant component of the SV40 capsid. | Electrophoretic properties of temperature-sensitive mutant particles of simian virus 40. Forty-five temperature-sensitive strains of simian virus 40 (SV40) particles belonging to four complementation groups were analyzed by agarose gel electrophoresis. Five strains (B204, B218, B233, and BC226), which are members of the B and BC complementation groups, yielded virions with aberrant mobilities. Genetic mapping by LAI and NATHANS suggested that B and BC mutantions are in a single gene. The mutant virions possessing altered mobilities have greater positive charges than wild-type particles. The findings presented here indicate that the product of gene B and BC is a significant component of the SV40 capsid. | [
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|
PMID:12132 | Influence of carbon monoxide on hemoglobin-oxygen binding. | The oxygen dissociation curve and Bohr effect were measured in normal whole blood as a function of carboxyhemoglobin concentration [HbCO]. pH was changed by varying CO2 concentration (CO2 Bohr effect) or by addition of isotonic NaOH or HCl at constant PCO2 (fixed acid Bohr effect). As [HbCO] varied through the range of 2, 25, 50, and 75%, P50 was 26.3, 18.0, 11.6, and 6.5 mmHg, respectively. CO2 Bohr effect was highest at low oxygen saturations. This effect did not change as [HbCO] was increased. However, as [HbCO] was increased from 2 to 75%, the fixed acid Bohr factor increased in magnitude from -0.20 to -0.80 at very low oxygen saturations. The effect of molecular CO2 binding (carbamino) on oxygen affinity was eliminated at high [HbCO]. These results are consistent with the initial binding of O2 or CO to the alpha-chain of hemoglobin. The results also suggest that heme-heme interaction is different for oxygen than for carbon monoxide. | Influence of carbon monoxide on hemoglobin-oxygen binding. The oxygen dissociation curve and Bohr effect were measured in normal whole blood as a function of carboxyhemoglobin concentration [HbCO]. pH was changed by varying CO2 concentration (CO2 Bohr effect) or by addition of isotonic NaOH or HCl at constant PCO2 (fixed acid Bohr effect). As [HbCO] varied through the range of 2, 25, 50, and 75%, P50 was 26.3, 18.0, 11.6, and 6.5 mmHg, respectively. CO2 Bohr effect was highest at low oxygen saturations. This effect did not change as [HbCO] was increased. However, as [HbCO] was increased from 2 to 75%, the fixed acid Bohr factor increased in magnitude from -0.20 to -0.80 at very low oxygen saturations. The effect of molecular CO2 binding (carbamino) on oxygen affinity was eliminated at high [HbCO]. These results are consistent with the initial binding of O2 or CO to the alpha-chain of hemoglobin. The results also suggest that heme-heme interaction is different for oxygen than for carbon monoxide. | [
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|
PMID:12133 | Partial purification and some properties of delta1-pyrroline-5-carboxylate reductase from Escherichia coli. | delta1-Pyrroline-5-carboxylate (PCA) reductase [L-proline:NAD(P)+5-oxidoreductase, EC 1.5.1.2] has been purified over 200-fold from Escherichia coli K-12. It has a molecular weight of approximately 320,000. PCA reductase mediates the pyridine nucleotide-linked reduction of PCA to proline but not the reverse reaction (even at high substrate concentrations). The partially purified preparation is free of competing pyridine nucleotide oxidase, PCA dehydrogenase, and proline oxidase activities. The Michaelis constant (Km) values for the substrate, PCA, with reduced nicotinamide adenine dinucleotide phosphate (NADPH) or NADH as cofactor are 0.15 and 0.14 mM, respectively. The Km values determined for NADPH and NADH are 0.03 and 0.23 mM, respectively. Although either NADPH or NADH can function as cofactor, the activity observed with NADPH is severalfold greater. PCA reductase is not repressed by growth in the presence of proline, but it is inhibited by the reaction end products, proline and NADP. | Partial purification and some properties of delta1-pyrroline-5-carboxylate reductase from Escherichia coli. delta1-Pyrroline-5-carboxylate (PCA) reductase [L-proline:NAD(P)+5-oxidoreductase, EC 1.5.1.2] has been purified over 200-fold from Escherichia coli K-12. It has a molecular weight of approximately 320,000. PCA reductase mediates the pyridine nucleotide-linked reduction of PCA to proline but not the reverse reaction (even at high substrate concentrations). The partially purified preparation is free of competing pyridine nucleotide oxidase, PCA dehydrogenase, and proline oxidase activities. The Michaelis constant (Km) values for the substrate, PCA, with reduced nicotinamide adenine dinucleotide phosphate (NADPH) or NADH as cofactor are 0.15 and 0.14 mM, respectively. The Km values determined for NADPH and NADH are 0.03 and 0.23 mM, respectively. Although either NADPH or NADH can function as cofactor, the activity observed with NADPH is severalfold greater. PCA reductase is not repressed by growth in the presence of proline, but it is inhibited by the reaction end products, proline and NADP. | [
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|
PMID:12134 | Chemotaxis toward amino acids by Bacillus subtilis. | Conditions for assaying chemotaxis in Bacillus subtilis are described. The chemotaxis medium we used afforded excellent motility for hours. In it, chemotaxis measured by capillary assays was insensitive to pH between 5.5 and 9, and to temperature between 28 degrees C and 42 degrees C. Chemotaxis was observed toward all 20 common amino acids, with thresholds varying from 3nM for alanine to 0.1 mM for glutamate, in the capillary assay, and from 0.1 muM for alanine to 0.32 mM for glutamate in the microscope assay. | Chemotaxis toward amino acids by Bacillus subtilis. Conditions for assaying chemotaxis in Bacillus subtilis are described. The chemotaxis medium we used afforded excellent motility for hours. In it, chemotaxis measured by capillary assays was insensitive to pH between 5.5 and 9, and to temperature between 28 degrees C and 42 degrees C. Chemotaxis was observed toward all 20 common amino acids, with thresholds varying from 3nM for alanine to 0.1 mM for glutamate, in the capillary assay, and from 0.1 muM for alanine to 0.32 mM for glutamate in the microscope assay. | [
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|
PMID:12135 | Properties of tyrosine-inhibitable 3-deoxy-d-arabinoheptulosonic acid-7-phosphate synthase from Salmonella. | Tyrosine-inhibitable 3-deoxy-D-arabinoheptulosonic acid-7-phosphate (DAHP) synthase was purified to homogeneity without significant loss of sensitivity to inhibition by tyrosine from an operator-constitutive strain (tyrOc) of Salmonella. The enzyme had an apparent molecular weight of 76,000 by gel filtration and a subunit molecular weight of 40,000 by sodium dodecyl sulfate-gel electrophoresis and by reaction with dimethyl suberimidate. It had an isoelectric point of 4.68. Inhibition by L-tyrosine showed a Hill coefficient of 1.8 at pH 7.0, suggesting cooperative interaction between tyrosine-binding sites, and was competitive with phosphoenol pyruvate and noncompetitive with erythrose-4-phosphate. | Properties of tyrosine-inhibitable 3-deoxy-d-arabinoheptulosonic acid-7-phosphate synthase from Salmonella. Tyrosine-inhibitable 3-deoxy-D-arabinoheptulosonic acid-7-phosphate (DAHP) synthase was purified to homogeneity without significant loss of sensitivity to inhibition by tyrosine from an operator-constitutive strain (tyrOc) of Salmonella. The enzyme had an apparent molecular weight of 76,000 by gel filtration and a subunit molecular weight of 40,000 by sodium dodecyl sulfate-gel electrophoresis and by reaction with dimethyl suberimidate. It had an isoelectric point of 4.68. Inhibition by L-tyrosine showed a Hill coefficient of 1.8 at pH 7.0, suggesting cooperative interaction between tyrosine-binding sites, and was competitive with phosphoenol pyruvate and noncompetitive with erythrose-4-phosphate. | [
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|
PMID:12136 | Vesicle penicillinase of Bacillus licheniformis: existence of periplasmic-releasing factor(s). | In earlier studies of the membrane-bound penicillinase of Bacillus licheniformis 749/C, the enzyme present in the vesicles that were released during protoplast formation and the enzyme retained in the plasma membrane of protoplasts appeared to differ (i) in their behavior on gel permeation chromatography in the presence or absence of deoxycholate and (ii) in their tendency to convert to the hydrophilic exoenzyme (Sargent and Lampen, 1970). We have now shown that these vesicle preparations contain a soluble, heat-sensitive enzyme(s) that is released along with the vesicles during protoplast formation. The enzyme will convert the vesicle penicillinase to a form that resembles exopenicillinase, and this conversion can be inhibited by deoxycholate under certain circumstances. Sedimentation of such vesicle preparations at 100,000 X g produces vesicles which contain penicillinase that behaves as the plasma membrane enzyme obtained from protoplasts. Exopenicillinases released by growing cells at pH 6.5 and by washed cells or protoplasts at pH 9.0 have the same NH2-terminal residues (lysine and some glutamic acid); in addition, the various release systems show a parallel sensitivity to inhibition by deoxycholate, quinacrine, chloroquine, and o-phenanthroline. The formation of exopenicillinase (by cleavage of the membrane-bound enzyme) may well be dependent on the action of the releasing enzyme. | Vesicle penicillinase of Bacillus licheniformis: existence of periplasmic-releasing factor(s). In earlier studies of the membrane-bound penicillinase of Bacillus licheniformis 749/C, the enzyme present in the vesicles that were released during protoplast formation and the enzyme retained in the plasma membrane of protoplasts appeared to differ (i) in their behavior on gel permeation chromatography in the presence or absence of deoxycholate and (ii) in their tendency to convert to the hydrophilic exoenzyme (Sargent and Lampen, 1970). We have now shown that these vesicle preparations contain a soluble, heat-sensitive enzyme(s) that is released along with the vesicles during protoplast formation. The enzyme will convert the vesicle penicillinase to a form that resembles exopenicillinase, and this conversion can be inhibited by deoxycholate under certain circumstances. Sedimentation of such vesicle preparations at 100,000 X g produces vesicles which contain penicillinase that behaves as the plasma membrane enzyme obtained from protoplasts. Exopenicillinases released by growing cells at pH 6.5 and by washed cells or protoplasts at pH 9.0 have the same NH2-terminal residues (lysine and some glutamic acid); in addition, the various release systems show a parallel sensitivity to inhibition by deoxycholate, quinacrine, chloroquine, and o-phenanthroline. The formation of exopenicillinase (by cleavage of the membrane-bound enzyme) may well be dependent on the action of the releasing enzyme. | [
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|
PMID:12137 | Penicillinase-releasing protease of Bacillus licheniformis: purification and general properties. | The membrane penicillinase of Bacillus licheniformis 749/C is a phospholipoprotein which differs from the exoenzyme in that it has an additional sequence of 24 amino acid residues and a phosphatidylserine at the NH2 terminus. In exponential-phase cultures, the conversion of membrane penicillinase to exoenzyme occurs at neutral and alkaline pH. An enzyme that will cleave the membrane penicillinase to yield the exoenzyme is present (in small amounts) in exponential-phase cells and is released during their conversion to protoplasts. The enzyme is found in the filtrate of a stationary-phase culture of the uninduced penicillinase-inducible strain 749 and has been purified to apparent homogeneity from this source. The protease has an approximate molecular weight of 21,500 and requires Ca2+ ions for stabilization. It has a pH optimum of 7.0 to 9.5 for hydrolysis of casein and for the cleavage of membrane penicillinase. Both activities are inhibited by diisopropylfluorophosphate; hence, the enzyme is a serine protease. This enzyme may be entirely responsible for the formation of exopenicillinase by this organism, since the other neutral and alkaline proteases of strain 749 have little, if any, activity in releasing exopenicillinase. The enzyme has been termed penicillinase-releasing protease. | Penicillinase-releasing protease of Bacillus licheniformis: purification and general properties. The membrane penicillinase of Bacillus licheniformis 749/C is a phospholipoprotein which differs from the exoenzyme in that it has an additional sequence of 24 amino acid residues and a phosphatidylserine at the NH2 terminus. In exponential-phase cultures, the conversion of membrane penicillinase to exoenzyme occurs at neutral and alkaline pH. An enzyme that will cleave the membrane penicillinase to yield the exoenzyme is present (in small amounts) in exponential-phase cells and is released during their conversion to protoplasts. The enzyme is found in the filtrate of a stationary-phase culture of the uninduced penicillinase-inducible strain 749 and has been purified to apparent homogeneity from this source. The protease has an approximate molecular weight of 21,500 and requires Ca2+ ions for stabilization. It has a pH optimum of 7.0 to 9.5 for hydrolysis of casein and for the cleavage of membrane penicillinase. Both activities are inhibited by diisopropylfluorophosphate; hence, the enzyme is a serine protease. This enzyme may be entirely responsible for the formation of exopenicillinase by this organism, since the other neutral and alkaline proteases of strain 749 have little, if any, activity in releasing exopenicillinase. The enzyme has been termed penicillinase-releasing protease. | [
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|
PMID:12138 | Carboxylation of phosphoenolpyruvate by extracts of Neisseria gonorrhoeae. | The enzymatic carboxylation of phosphoenolpyruvate by cell-free extracts of Neisseria gonorrhoeae was examined and determined to be similar to the reaction catalyzed by phosphoenolpyruvate carboxylase (PEPC). This was shown by the irreversibility of the reaction and nucleotide independency. The enzyme was found to have some characteristics different from the other bacterial PEPCs reported. The enzyme showed catalytic activity in the presence of cobalt ions as well as magnesium and manganese ions, was not inhibited by succinate in fresh extracts, and displayed a low Michaelis constant for bicarbonate (0.27 mM), as compared with other PEPCs. The significance of this low Michaelis constant is discussed with respect to the growth of the organism and the importance of this enzyme to protein and nucleic acid synthesis. | Carboxylation of phosphoenolpyruvate by extracts of Neisseria gonorrhoeae. The enzymatic carboxylation of phosphoenolpyruvate by cell-free extracts of Neisseria gonorrhoeae was examined and determined to be similar to the reaction catalyzed by phosphoenolpyruvate carboxylase (PEPC). This was shown by the irreversibility of the reaction and nucleotide independency. The enzyme was found to have some characteristics different from the other bacterial PEPCs reported. The enzyme showed catalytic activity in the presence of cobalt ions as well as magnesium and manganese ions, was not inhibited by succinate in fresh extracts, and displayed a low Michaelis constant for bicarbonate (0.27 mM), as compared with other PEPCs. The significance of this low Michaelis constant is discussed with respect to the growth of the organism and the importance of this enzyme to protein and nucleic acid synthesis. | [
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|
PMID:12139 | Mismatch excision and possible polarity effects result in preferred deoxyribonucleic acid strand of integration in pneumococcal transformation. | Heteroduplex deoxyribonucleic acid molecules having a drug resistance marker on one strand and its wild-type allele on the other have been used as donors in pneumococcal transformation. Opposite strands are not equally effective in producing transformants, and this strand bias is not the same, either in direction or magnitude, for various different genetic markers. Selective excision of mismatched base pairs is probably responsible for the large differences in strand efficiency seen with discriminating (hex+) strains, for when the recipient is nondiscriminating (hex-), and therefore presumably lacking an excision enzyme system, strand bias is drastically reduced or altered. The evidence also indicates that excision occurs after integration, as it is provoked by specific donor-recipient mismatch and not by the same mismatch when introduced within donor heteroduplex molecules. Excision can extend to include a neighboring linked marker which would otherwise not be excised, thus altering its intrinsic strand bias as well as its efficiency in transformation. There is a small bias in relative strand efficiency for some markers, not caused by mismatch excision, which perhaps is due to polarity in the integration process itself. | Mismatch excision and possible polarity effects result in preferred deoxyribonucleic acid strand of integration in pneumococcal transformation. Heteroduplex deoxyribonucleic acid molecules having a drug resistance marker on one strand and its wild-type allele on the other have been used as donors in pneumococcal transformation. Opposite strands are not equally effective in producing transformants, and this strand bias is not the same, either in direction or magnitude, for various different genetic markers. Selective excision of mismatched base pairs is probably responsible for the large differences in strand efficiency seen with discriminating (hex+) strains, for when the recipient is nondiscriminating (hex-), and therefore presumably lacking an excision enzyme system, strand bias is drastically reduced or altered. The evidence also indicates that excision occurs after integration, as it is provoked by specific donor-recipient mismatch and not by the same mismatch when introduced within donor heteroduplex molecules. Excision can extend to include a neighboring linked marker which would otherwise not be excised, thus altering its intrinsic strand bias as well as its efficiency in transformation. There is a small bias in relative strand efficiency for some markers, not caused by mismatch excision, which perhaps is due to polarity in the integration process itself. | [
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|
PMID:12140 | Ultrastructural, physiological, and cytochemical characterization of cores in group D streptococci. | Cores are large, rod-shaped structures that have been found almost exclusively in group D streptococci, measure 0.1 to 0.16 mum in diameter, and extend the width or length of cells. This study has shown that cores are produced in the cells at a reproducible point in early stationary growth after extensive mesosomal formation and after the pH has dropped below 6.5. When cells containing cores were introduced into a fresh medium with a pH above 6.5, the structures disappeared within 5 min. The structures were not found in young, logarithmically growing cells but formed in these cells upon autolysis or treatment with penicillin. Cores that were forming or disintegrating appeared to have a lamellar substructure. When chloramphenicol was added to the medium before the culture reached stationary phase, no cores were found in the cells. Cytochemical studies indicated that cores contain protein and are not composed of cell wall material or other polysaccharides that contain 1,2-glycol groups. | Ultrastructural, physiological, and cytochemical characterization of cores in group D streptococci. Cores are large, rod-shaped structures that have been found almost exclusively in group D streptococci, measure 0.1 to 0.16 mum in diameter, and extend the width or length of cells. This study has shown that cores are produced in the cells at a reproducible point in early stationary growth after extensive mesosomal formation and after the pH has dropped below 6.5. When cells containing cores were introduced into a fresh medium with a pH above 6.5, the structures disappeared within 5 min. The structures were not found in young, logarithmically growing cells but formed in these cells upon autolysis or treatment with penicillin. Cores that were forming or disintegrating appeared to have a lamellar substructure. When chloramphenicol was added to the medium before the culture reached stationary phase, no cores were found in the cells. Cytochemical studies indicated that cores contain protein and are not composed of cell wall material or other polysaccharides that contain 1,2-glycol groups. | [
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|
PMID:12141 | Casamino acids enhance growth of Bacteroides melaninogenicus. | Casamino Acids enhance the growth of Bacteroides melaninogenicus when added to various concentrations of Trypticase. Absence of a peptide, not amino acids, is responsible for the inability of Casamino Acids to support growth. | Casamino acids enhance growth of Bacteroides melaninogenicus. Casamino Acids enhance the growth of Bacteroides melaninogenicus when added to various concentrations of Trypticase. Absence of a peptide, not amino acids, is responsible for the inability of Casamino Acids to support growth. | [
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PMID:12142 | The chemical modification of beef liver catalase. V. Ethoxyformylation of histidine and tyrosine residues of catalase with diethylpyrocarbonate. | In order to elucidate the possible roles of histidine and tyrosine residues of catalase [EC 1.11.1.6] in maintaining the quaternary structure and catalatic activity, diethylpyrocarbonate modification experiments were carried out. A method for the estimation of N-ethoxyformyl (EF)-His at pH 5--7 and of O-ethoxyformyl (EF)-Tyr in alkaline solution by measuring A 242 nm (ximM = 3.2) and A278 nm (ximM = 1.16), respectively, was developed. The formation of EF-His and EF-Tyr was an electrophilic reaction and was dependent on pH, exhibiting pK values of 6.8 and 9.9, respectively. The maximal yield of EF-His at pH 6.0 was 49% of the total histidine content, but no inactivation nor unfolding of the enzyme was observed. The formation of 12 EF-Tyr residues per mole of catalase at pH 8.1 did not cause any inactivation, but the formation of 8 more EF-Tyr residues at pH 8.9 resulted in both inactivation and unfolding. Nearly complete inactivation and partial splitting of catalase were observed when 43-46 EF-Tyr residues per mole were produced at pH 10.0. More EF-His residues were formed by the reaction of diethyl pyrocarbonate with cyanoethylated (CE)-catalase monomer (subunit) than with CE-catalase tetramer. The CE-catalase tetramer and monomer were extensively O-ethoxyformylated, reaching 100% EF-Tyr formation. These results indicate that a half of the histidine residues may lie outside the protein core and that three-quarters of the tyrosine residues are probably in the protein core of the enzyme. The production of 2--3 EF-Tyr residues per mole of the monomer by ethoxyformylation at pH 7.0 was accompanied by a decrease in the magnitude of the Soret peak. A possible interaction of those tyrosine residues with porphyrin of the heme group is discussed. | The chemical modification of beef liver catalase. V. Ethoxyformylation of histidine and tyrosine residues of catalase with diethylpyrocarbonate. In order to elucidate the possible roles of histidine and tyrosine residues of catalase [EC 1.11.1.6] in maintaining the quaternary structure and catalatic activity, diethylpyrocarbonate modification experiments were carried out. A method for the estimation of N-ethoxyformyl (EF)-His at pH 5--7 and of O-ethoxyformyl (EF)-Tyr in alkaline solution by measuring A 242 nm (ximM = 3.2) and A278 nm (ximM = 1.16), respectively, was developed. The formation of EF-His and EF-Tyr was an electrophilic reaction and was dependent on pH, exhibiting pK values of 6.8 and 9.9, respectively. The maximal yield of EF-His at pH 6.0 was 49% of the total histidine content, but no inactivation nor unfolding of the enzyme was observed. The formation of 12 EF-Tyr residues per mole of catalase at pH 8.1 did not cause any inactivation, but the formation of 8 more EF-Tyr residues at pH 8.9 resulted in both inactivation and unfolding. Nearly complete inactivation and partial splitting of catalase were observed when 43-46 EF-Tyr residues per mole were produced at pH 10.0. More EF-His residues were formed by the reaction of diethyl pyrocarbonate with cyanoethylated (CE)-catalase monomer (subunit) than with CE-catalase tetramer. The CE-catalase tetramer and monomer were extensively O-ethoxyformylated, reaching 100% EF-Tyr formation. These results indicate that a half of the histidine residues may lie outside the protein core and that three-quarters of the tyrosine residues are probably in the protein core of the enzyme. The production of 2--3 EF-Tyr residues per mole of the monomer by ethoxyformylation at pH 7.0 was accompanied by a decrease in the magnitude of the Soret peak. A possible interaction of those tyrosine residues with porphyrin of the heme group is discussed. | [
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|
PMID:12143 | Involvement of cyclic GMP in the initial stage of hepatocytes proliferation. | A transient rise in cyclic guanosine 3' : 5' monophosphate (c-GMP) in the liver was observed in rats in vivo 10--20 min after partial hepatectomy. A similar increase in c-GMP in the liver was also found in rats in vivo 15 min after infusion of TGH solution (a mixture of triiodothyronine, glucagon, and heparin). In both cases, inductions of ornithine decarboxylase [EC 4.1.1.17] and tyrosine aminotransferase [EC 2.6.1.5] were found 4 hr after the beginning of the experiments. Later, 22 hr after the surgical intervention or hormone infusion, thymidine kinase [EC 2.7.1.21] was activated and liver slices were able to incorporate [3H]thymidine into DNA. These biochemical phenomena were observed commonly in regenerating liver as well as in the liver of rats infused with TGH solution. c-GMP, but not c-AMP, could induce ornithine decarboxylase and tyrosine aminotransferase in isolated, perfused liver. | Involvement of cyclic GMP in the initial stage of hepatocytes proliferation. A transient rise in cyclic guanosine 3' : 5' monophosphate (c-GMP) in the liver was observed in rats in vivo 10--20 min after partial hepatectomy. A similar increase in c-GMP in the liver was also found in rats in vivo 15 min after infusion of TGH solution (a mixture of triiodothyronine, glucagon, and heparin). In both cases, inductions of ornithine decarboxylase [EC 4.1.1.17] and tyrosine aminotransferase [EC 2.6.1.5] were found 4 hr after the beginning of the experiments. Later, 22 hr after the surgical intervention or hormone infusion, thymidine kinase [EC 2.7.1.21] was activated and liver slices were able to incorporate [3H]thymidine into DNA. These biochemical phenomena were observed commonly in regenerating liver as well as in the liver of rats infused with TGH solution. c-GMP, but not c-AMP, could induce ornithine decarboxylase and tyrosine aminotransferase in isolated, perfused liver. | [
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|
PMID:12144 | Studies on phospholipase A in Trimeresurus flaoviridis venom. III. Purification and some properties of phospholipase A inhibitor in Habu serum. | Phospholipase A [EC 3.1.1.4] inhibitor was purified from Habu (Trimeresurus flavivurudls) serum by gel filtration on Sephadex G-200, chromatography on DE-23 cellulose and affinity chromatography on a Sepharose 4B-phospholipase A column. By these procedures, a 31-fold increase in specific activity was attained with a yield of 15%. The purified material was homogeneous as judged by cellulose acetate and polyacrylamide gel electrophoresis. It had an apparent molecular weight of 100,000 as measured by gel filtration on Sephadex G-200. The purified inhibitor was stable for 20 min at 80 degrees and was unstable below pH 6. It migrated before albumin in cellulose acetate electrophoresis and did not form any precipitin line with the crude venom or with purified phospholipase A in immunodiffusin tests. An 8-fold excess of the purified inhibitor by weight was required to inhibit completely both the egg yolk clearing action and the hemolytic action of phospholipase A. | Studies on phospholipase A in Trimeresurus flaoviridis venom. III. Purification and some properties of phospholipase A inhibitor in Habu serum. Phospholipase A [EC 3.1.1.4] inhibitor was purified from Habu (Trimeresurus flavivurudls) serum by gel filtration on Sephadex G-200, chromatography on DE-23 cellulose and affinity chromatography on a Sepharose 4B-phospholipase A column. By these procedures, a 31-fold increase in specific activity was attained with a yield of 15%. The purified material was homogeneous as judged by cellulose acetate and polyacrylamide gel electrophoresis. It had an apparent molecular weight of 100,000 as measured by gel filtration on Sephadex G-200. The purified inhibitor was stable for 20 min at 80 degrees and was unstable below pH 6. It migrated before albumin in cellulose acetate electrophoresis and did not form any precipitin line with the crude venom or with purified phospholipase A in immunodiffusin tests. An 8-fold excess of the purified inhibitor by weight was required to inhibit completely both the egg yolk clearing action and the hemolytic action of phospholipase A. | [
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|
PMID:12145 | Studies on triglyceride lipases from rat adipose tissue. | A new assay procedure for triglyceride lipase [EC 3.1.1.3] was developed in which radioactive triolein was dissolved in ethanol and directly added to the reaction mixture in the absence of serum and albumin. In the rat adipose tissue there appeared to be a triglyceride lipase measurable with this assay in addition to the two previously defined lipases, lipoprotein lipase [EC 3.1.1.34] and hormone-sensitive lipase. The enzyme was active in the absence of serum and was strongly inhibited by albumin. The molecular weight was estimated to be about 42,000. Adenosine 3',5'-monophosphate-dependent protein kinase [EC 2.7.1.27] was unable to activate the enzyme. The three species of lipases mentioned above behaved differently upon chromatography on a Sepharose 4B column, and were distinguishable from each other in their physical and kinetic properties. The physiological roles of the new species of lipase remain to be explored. | Studies on triglyceride lipases from rat adipose tissue. A new assay procedure for triglyceride lipase [EC 3.1.1.3] was developed in which radioactive triolein was dissolved in ethanol and directly added to the reaction mixture in the absence of serum and albumin. In the rat adipose tissue there appeared to be a triglyceride lipase measurable with this assay in addition to the two previously defined lipases, lipoprotein lipase [EC 3.1.1.34] and hormone-sensitive lipase. The enzyme was active in the absence of serum and was strongly inhibited by albumin. The molecular weight was estimated to be about 42,000. Adenosine 3',5'-monophosphate-dependent protein kinase [EC 2.7.1.27] was unable to activate the enzyme. The three species of lipases mentioned above behaved differently upon chromatography on a Sepharose 4B column, and were distinguishable from each other in their physical and kinetic properties. The physiological roles of the new species of lipase remain to be explored. | [
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|
PMID:12146 | Purification and properties of oxytocinase (cystine amino-peptidase) from monkey placenta. | Oxytocinase (cystyl-aminopeptidase) [EC 3.4.11.3] was isolated from monkey placenta in a purified form by a six-step prodedure comprising extraction from monkey placenta homogenate, ammonium sulfate fractionation, repeated chromatography on hydroxylapatite, chromatography on a column of DEAE-cellulose and gel filtration on a column of Sephadex G-200. The purified enzyme showed a single band on polyacrylamide disc electrophoresis. Oxytocin was inactivated by this enzyme preparation. The enzyme hydrolyzed several aminoacyl-beta-naphthylamides. A terminal amino group was required for enzyme activity. The molecular weight of the purified enzyme was estimated to be 87,000 by gel filtration and 83,000 by sodium dodecyl sulfate gel electrophoresis. Other properties of the enzyme, the effects of metal ions and various chemical reagents on the enzyme activity, the pH optimum, and Km values for a number of aminoacyl-beta-naphthylamides were also examined. | Purification and properties of oxytocinase (cystine amino-peptidase) from monkey placenta. Oxytocinase (cystyl-aminopeptidase) [EC 3.4.11.3] was isolated from monkey placenta in a purified form by a six-step prodedure comprising extraction from monkey placenta homogenate, ammonium sulfate fractionation, repeated chromatography on hydroxylapatite, chromatography on a column of DEAE-cellulose and gel filtration on a column of Sephadex G-200. The purified enzyme showed a single band on polyacrylamide disc electrophoresis. Oxytocin was inactivated by this enzyme preparation. The enzyme hydrolyzed several aminoacyl-beta-naphthylamides. A terminal amino group was required for enzyme activity. The molecular weight of the purified enzyme was estimated to be 87,000 by gel filtration and 83,000 by sodium dodecyl sulfate gel electrophoresis. Other properties of the enzyme, the effects of metal ions and various chemical reagents on the enzyme activity, the pH optimum, and Km values for a number of aminoacyl-beta-naphthylamides were also examined. | [
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|
PMID:12147 | Isolation of myosin from starfish sperm heads. | Myosin was extracted and partially purified from the head portion of spermatozoa of the starfish, Asterias amurensis. The sperm myosin showed a specific Ca2+-activated ATPase [EC 3.6.1.3] activity of 0.2 mumoles Pi/min/mg at high ionic strength and pH 6.5. It resembled egg myosin in forming thick filaments, becoming attached to actin filaments. subunit composition, and serological properties. | Isolation of myosin from starfish sperm heads. Myosin was extracted and partially purified from the head portion of spermatozoa of the starfish, Asterias amurensis. The sperm myosin showed a specific Ca2+-activated ATPase [EC 3.6.1.3] activity of 0.2 mumoles Pi/min/mg at high ionic strength and pH 6.5. It resembled egg myosin in forming thick filaments, becoming attached to actin filaments. subunit composition, and serological properties. | [
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PMID:12148 | A clottable protein (coagulogen) from amoebocyte lysate of Japanese horseshoe crab (Tachypleus tridentatus). Its isolation and biochemical properties. | A clottable protein, named coagulogen, was highly purified from the amoebocyte lysate of Japanese horseshoe crab (Tachypleus tridentatus) by a method similar to that used for the lysate of Limulus polyphemus amoebocytes. The isolated material gave a single protein band on analytical gel electrophoresis at pH 3.2, gel electrofocusing, and sodium dodecyl sulfate (SDS) gel electrophoresis with or without 2-mercaptoethanol. It was 90 percent coagulable, and the total yield from 10 ml of the amoebocyte lysate was about 40 mg. The sedimentation coefficient of purified coagulogen was 2.6 S and its molecular weight was estimated to be about 15,300 by sedimentation equilibrium analysis. The molecular weight estimated by SDS-gel electrophoretic analysis was 19,500 +/- 1,000. This discrepancy was apparently due to abnormal mobility arising from the basic nature of this protein on electrophoresis. The protein had a high isoelectric point of pH 10.0 +/- 0.2, as measured by the isoelectric focusing technique. It consisted of a total of 132 to 135 amino acid residues and contained high levels of basic amino acids, which accounted for more than 16 per cent of the total amino acid residues. No methionine was detected. High contents of valine, half-cystine, glutamic acid (glutamine), and phenylalanine were found. The N-terminal sequence of the first three residues of the coagulogen was Ala-Asx-Thr, and its C-terminal residues was identified as phenylalanine, indicating that it consists of a single polypeptide chain. It is of interest that the first three N-terminal residues are homologous with those of the Aalpha-chain of non-human primate fibrinogen. | A clottable protein (coagulogen) from amoebocyte lysate of Japanese horseshoe crab (Tachypleus tridentatus). Its isolation and biochemical properties. A clottable protein, named coagulogen, was highly purified from the amoebocyte lysate of Japanese horseshoe crab (Tachypleus tridentatus) by a method similar to that used for the lysate of Limulus polyphemus amoebocytes. The isolated material gave a single protein band on analytical gel electrophoresis at pH 3.2, gel electrofocusing, and sodium dodecyl sulfate (SDS) gel electrophoresis with or without 2-mercaptoethanol. It was 90 percent coagulable, and the total yield from 10 ml of the amoebocyte lysate was about 40 mg. The sedimentation coefficient of purified coagulogen was 2.6 S and its molecular weight was estimated to be about 15,300 by sedimentation equilibrium analysis. The molecular weight estimated by SDS-gel electrophoretic analysis was 19,500 +/- 1,000. This discrepancy was apparently due to abnormal mobility arising from the basic nature of this protein on electrophoresis. The protein had a high isoelectric point of pH 10.0 +/- 0.2, as measured by the isoelectric focusing technique. It consisted of a total of 132 to 135 amino acid residues and contained high levels of basic amino acids, which accounted for more than 16 per cent of the total amino acid residues. No methionine was detected. High contents of valine, half-cystine, glutamic acid (glutamine), and phenylalanine were found. The N-terminal sequence of the first three residues of the coagulogen was Ala-Asx-Thr, and its C-terminal residues was identified as phenylalanine, indicating that it consists of a single polypeptide chain. It is of interest that the first three N-terminal residues are homologous with those of the Aalpha-chain of non-human primate fibrinogen. | [
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PMID:12149 | The mechanism of reassembly of immunoglobulin G. | The noncovalent interaction of light (L) chain with heavy (H) chain or Fd isolated from a human myeloma protein Jo (IgG1, kappa) was studied by following circular dichroic (CD) change at 235 nm. The dimerization constants of Jo-L chain determined by measuring the CD change at 293 nm with protein concentration showed that the Jo-L chain exists as the monomeric form under the experimental conditions used for recombination with H chain. The second-order rate constants for the interaction between H and L chains were in good agreement with those for the interaction between Fd and L chain at various pH values. The binding behavior of L chain to Fd could be described by a single association constant. In the interpretation of the binding of L chain to H chain, however, it was necessary to assume that the binding of L chain to one of the two sites on H chain dimer (H2) decreases the affinity of the other site for L chain. The binding constant of the first L chain to H2 was the same as that of L chain to Fd. Renaturation processes of L chain, Fd, Fab(SS) fragment (with intact interchain disulfide bond), and Fab(RA) fragment (in which the interchain disulfide bond had been reduced and alkylated) from the denatured states in 0.5 or 1 M acetic acid on neutralization were studied. The renaturation of Fd occurred very rapidly, while that of L chain consisted of a very rapid process and a slow process which followed first-order kinetics. The renaturation process of Fab(SS) consisted of rapid and slow phases, of which the latter followed first-order kinetics. The renaturation process of Fab(RA) also consisted of rapid and slow phases, but the latter process followed second-order kinetics. The overall rate constant of renaturation of Fab(RA) was the same as that of the reformation of Fab(RA) from isolated Fd and L chain. On the basis of these facts, the kinetic mechanism by which Fd and L chain recombine to yield Fab(RA) can be described in terms of the scheme Fd + L in equilibrium Fd ... L leads to Fab(RA), where Fd ... L is an intermediate, and CD change is only observed in the second unimolecular process and not in the first bimolecular process. | The mechanism of reassembly of immunoglobulin G. The noncovalent interaction of light (L) chain with heavy (H) chain or Fd isolated from a human myeloma protein Jo (IgG1, kappa) was studied by following circular dichroic (CD) change at 235 nm. The dimerization constants of Jo-L chain determined by measuring the CD change at 293 nm with protein concentration showed that the Jo-L chain exists as the monomeric form under the experimental conditions used for recombination with H chain. The second-order rate constants for the interaction between H and L chains were in good agreement with those for the interaction between Fd and L chain at various pH values. The binding behavior of L chain to Fd could be described by a single association constant. In the interpretation of the binding of L chain to H chain, however, it was necessary to assume that the binding of L chain to one of the two sites on H chain dimer (H2) decreases the affinity of the other site for L chain. The binding constant of the first L chain to H2 was the same as that of L chain to Fd. Renaturation processes of L chain, Fd, Fab(SS) fragment (with intact interchain disulfide bond), and Fab(RA) fragment (in which the interchain disulfide bond had been reduced and alkylated) from the denatured states in 0.5 or 1 M acetic acid on neutralization were studied. The renaturation of Fd occurred very rapidly, while that of L chain consisted of a very rapid process and a slow process which followed first-order kinetics. The renaturation process of Fab(SS) consisted of rapid and slow phases, of which the latter followed first-order kinetics. The renaturation process of Fab(RA) also consisted of rapid and slow phases, but the latter process followed second-order kinetics. The overall rate constant of renaturation of Fab(RA) was the same as that of the reformation of Fab(RA) from isolated Fd and L chain. On the basis of these facts, the kinetic mechanism by which Fd and L chain recombine to yield Fab(RA) can be described in terms of the scheme Fd + L in equilibrium Fd ... L leads to Fab(RA), where Fd ... L is an intermediate, and CD change is only observed in the second unimolecular process and not in the first bimolecular process. | [
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PMID:12150 | Interaction between D-amino acid oxidase and small molecules. | 1. From the standpoint of monomer-dimer equilibrium of hog kidney D-amino acid oxidase [EC 1.4.3.3] and the interaction between the enzyme and small molecules, the effect of pH on the binding of p-aminobenzoate to the monomer and dimer of the enzyme was studied by kinetic methods and spectrophotometric titration. 2. The maximum binding number of p-aminobenzoate to the dimer is two molecules, and there is no interaction between the two active sites of the dimer (i.e., no cooperativity) over the range of pH from 6.5 to 10. 3. The affinity of the dimer for p-aminobenzoate is several times higher than that of the monomer at pH 6.5-10, and consequently p-aminobenzoate induces dimerization in the equilibrium state of D-amino acid oxidase. The interaction energy of two subunits of the dimer is stabilized by the binding of p-aminobenzoate by 1-2 kcal/mole over the pH range studied. 4. The binding sites of the quasi-substrate, p-aminobenzoate, in the dimer and the intersubunit binding site of the dimer are clearly different, because p-aminobenzoate induces dimerization of the enzyme. 5. The pK values of ionizing groups in the free monomer and the free dimer which participate in the binding of the competitive inhibitor, p-aminobenzoate, are approximately the same, 8.7, as determined from the pH dependence of the affinity of the inhibitor for the enzyme. Furthermore, no pK for the enzyme-inhibitor complex in the pH range 6.5-10 was observed. 6. There is no interaction between the two ionizing groups of the dimer during protonation-deprotonation, because a theoretical equation involving no cooperativity between the two ionizing groups in the dimer explains the results well. | Interaction between D-amino acid oxidase and small molecules. 1. From the standpoint of monomer-dimer equilibrium of hog kidney D-amino acid oxidase [EC 1.4.3.3] and the interaction between the enzyme and small molecules, the effect of pH on the binding of p-aminobenzoate to the monomer and dimer of the enzyme was studied by kinetic methods and spectrophotometric titration. 2. The maximum binding number of p-aminobenzoate to the dimer is two molecules, and there is no interaction between the two active sites of the dimer (i.e., no cooperativity) over the range of pH from 6.5 to 10. 3. The affinity of the dimer for p-aminobenzoate is several times higher than that of the monomer at pH 6.5-10, and consequently p-aminobenzoate induces dimerization in the equilibrium state of D-amino acid oxidase. The interaction energy of two subunits of the dimer is stabilized by the binding of p-aminobenzoate by 1-2 kcal/mole over the pH range studied. 4. The binding sites of the quasi-substrate, p-aminobenzoate, in the dimer and the intersubunit binding site of the dimer are clearly different, because p-aminobenzoate induces dimerization of the enzyme. 5. The pK values of ionizing groups in the free monomer and the free dimer which participate in the binding of the competitive inhibitor, p-aminobenzoate, are approximately the same, 8.7, as determined from the pH dependence of the affinity of the inhibitor for the enzyme. Furthermore, no pK for the enzyme-inhibitor complex in the pH range 6.5-10 was observed. 6. There is no interaction between the two ionizing groups of the dimer during protonation-deprotonation, because a theoretical equation involving no cooperativity between the two ionizing groups in the dimer explains the results well. | [
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|
PMID:12151 | A study of the interaction between D-amino acid oxidase and quasi-substrates. | To study the interaction between D-amino acid oxidase [EC 1.4.3.3] and quasi-substrates such as benzoate and o-, m-, and p-aminobenzoate, visible circular dichroism spectra (CD spectra) were measured and the binding rate and affinity of o-aminobenzoate to the enzyme were observed by following the absorption changes at various wavelengths. We found a new CD band around 560 nm, corresponding to the charge-transfer complexes which result from the formation of aminobenzoate complexes with the enzyme. The ellipticity of this band was positive for the p-aminobenzoate complex, but negative for the o- and m-aminobenzoate complexes. Crossover points in CD spectra were observed at 470 nm for the m-aminobenzoate complex and at 475 nm for the o-aminobenzoate complex. They probably resulted from overlapping of the positive CD band of FAD bound with the enzyme and the negative CD band of the charge-transfer complex. We propose that the amino group in aminobenzoate, not the pi-electrons of the benzene ring, is the electron donor in the charge-transfer complex and that the position of the amino group is very important for the charge-transfer interaction. The binding rate and affinity of o-aminobenzoate to the enzyme were determined using the absorption changes at 370 nm (380 nm), caused by the modification of electronic states of FAD bound with the enzyme, and at 550 nm (565 nm), caused by the formation of the charge-transfer complex of o-aminobenzoate with the enzyme. No differences between these parameters with wavelength were observed. This independence of wavelength simplifies discussion of the experimental data obtained from absorption changes. | A study of the interaction between D-amino acid oxidase and quasi-substrates. To study the interaction between D-amino acid oxidase [EC 1.4.3.3] and quasi-substrates such as benzoate and o-, m-, and p-aminobenzoate, visible circular dichroism spectra (CD spectra) were measured and the binding rate and affinity of o-aminobenzoate to the enzyme were observed by following the absorption changes at various wavelengths. We found a new CD band around 560 nm, corresponding to the charge-transfer complexes which result from the formation of aminobenzoate complexes with the enzyme. The ellipticity of this band was positive for the p-aminobenzoate complex, but negative for the o- and m-aminobenzoate complexes. Crossover points in CD spectra were observed at 470 nm for the m-aminobenzoate complex and at 475 nm for the o-aminobenzoate complex. They probably resulted from overlapping of the positive CD band of FAD bound with the enzyme and the negative CD band of the charge-transfer complex. We propose that the amino group in aminobenzoate, not the pi-electrons of the benzene ring, is the electron donor in the charge-transfer complex and that the position of the amino group is very important for the charge-transfer interaction. The binding rate and affinity of o-aminobenzoate to the enzyme were determined using the absorption changes at 370 nm (380 nm), caused by the modification of electronic states of FAD bound with the enzyme, and at 550 nm (565 nm), caused by the formation of the charge-transfer complex of o-aminobenzoate with the enzyme. No differences between these parameters with wavelength were observed. This independence of wavelength simplifies discussion of the experimental data obtained from absorption changes. | [
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PMID:12152 | Physiological significance of Ca uptake by mitochondria in the heart in comparison with that by cardiac sarcoplasmic reticulum. | It was investigated whether mitochondria play a significant role in the physiological regulation of the contractile process by Ca2+ in cardiac muscle in comparison with the sarcoplasmic reticulum (SR). Ca uptake activities of chicken cardiac SR and rabbit cardiac mitochondria were measured by means of centrifugation, dual-wave-length spectrophotometric and Millipore filtration methods. The maximum Ca uptake capacity of cardiac SR was usually 50-60 nmoles/mg protein and the apparent binding constant was 2.0 X 10(6) M-1. The apparent Ca-binding constant of cardiac mitochondria under limited loading conditions was 2.4 X 10(5) M-1 at pH 7.4 and 5.9 X 10(4) M-1 at pH 6.8. In the presence of 100 muM Ca2+ at 28-29 degrees, the estimated initial rate of Ca uptake of cardiac SR ranged from 20 to 30 nmoles Ca/mg-sec, while that of mitochondria was 4.6 nmoles Ca/mg-sec under limited loading conditions at pH 7.4 and 0.64 nmoles Ca/mg-sec under massive loading conditions at pH 6.8, which was much closer to physiological conditions. In the presence of low Ca2+ concentrations, the initial rate of Ca uptake of cardiac SR was 0.5 nmoles Ca/mg-sec at 3.5 X 10(-7) M Ca2+ and that of mitochondria under massive loading conditions at 1 X 10(-6) M Ca2+ was 0.02 nmoles Ca/mg-sec at pH 7.4 and 0.004 nmoles Ca/mg-sec at pH 6.8. The Ca uptake activities were also examined using glycerol-extracted cardiac muscle fibers. Cardiac SR, 1.7 mg/ml, reduced the tension of maximally contracted cardiac muscle fibers to a level corresponding to about 30% of maximum tension, but in the presence of 14.3 mg/ml of mitochondria the maximum tensions of both skeletal muscle and cardiac muscle fibers were maintained for at least 3 min. From these results the time course of relaxation of cardiac muscle induced by cardiac SR or mitochondria was calculated. It was concluded that, in the physiological contraction of cardiac muscle, the SR plays a major role in controlling intracellular Ca2+ movement; the Ca uptake of mitochondria is relatively insignificant. When the cardiac muscle contracts maximally, SR alone cannot relax the cardiac muscle without the aid of other Ca removing system. | Physiological significance of Ca uptake by mitochondria in the heart in comparison with that by cardiac sarcoplasmic reticulum. It was investigated whether mitochondria play a significant role in the physiological regulation of the contractile process by Ca2+ in cardiac muscle in comparison with the sarcoplasmic reticulum (SR). Ca uptake activities of chicken cardiac SR and rabbit cardiac mitochondria were measured by means of centrifugation, dual-wave-length spectrophotometric and Millipore filtration methods. The maximum Ca uptake capacity of cardiac SR was usually 50-60 nmoles/mg protein and the apparent binding constant was 2.0 X 10(6) M-1. The apparent Ca-binding constant of cardiac mitochondria under limited loading conditions was 2.4 X 10(5) M-1 at pH 7.4 and 5.9 X 10(4) M-1 at pH 6.8. In the presence of 100 muM Ca2+ at 28-29 degrees, the estimated initial rate of Ca uptake of cardiac SR ranged from 20 to 30 nmoles Ca/mg-sec, while that of mitochondria was 4.6 nmoles Ca/mg-sec under limited loading conditions at pH 7.4 and 0.64 nmoles Ca/mg-sec under massive loading conditions at pH 6.8, which was much closer to physiological conditions. In the presence of low Ca2+ concentrations, the initial rate of Ca uptake of cardiac SR was 0.5 nmoles Ca/mg-sec at 3.5 X 10(-7) M Ca2+ and that of mitochondria under massive loading conditions at 1 X 10(-6) M Ca2+ was 0.02 nmoles Ca/mg-sec at pH 7.4 and 0.004 nmoles Ca/mg-sec at pH 6.8. The Ca uptake activities were also examined using glycerol-extracted cardiac muscle fibers. Cardiac SR, 1.7 mg/ml, reduced the tension of maximally contracted cardiac muscle fibers to a level corresponding to about 30% of maximum tension, but in the presence of 14.3 mg/ml of mitochondria the maximum tensions of both skeletal muscle and cardiac muscle fibers were maintained for at least 3 min. From these results the time course of relaxation of cardiac muscle induced by cardiac SR or mitochondria was calculated. It was concluded that, in the physiological contraction of cardiac muscle, the SR plays a major role in controlling intracellular Ca2+ movement; the Ca uptake of mitochondria is relatively insignificant. When the cardiac muscle contracts maximally, SR alone cannot relax the cardiac muscle without the aid of other Ca removing system. | [
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PMID:12153 | Enzymatic studies on a cellulase system of Trichoderma viride. IV. Purification and properties of a less-random type cellulase. | A cellulase [EC 3.2.1.4] component was purified from a crude cellulase preparation of Trichoderma viride (Meicelase) by consecutive column chromatography procedures, and was designated as cellulase III. The enzyme was homogeneous on polyacrylamide gel disc electrophoresis. The molecular weight of the enzyme was estimated to be about 45,000 by gel filtration. The optimum pH and temperature of the enzyme were pH 4.5-5.0 and 50 degrees, respectively. The enzyme was stable over the range of pH 4.5-7.5 at 4 degrees for 24 hr, and retained 40% of the original carboxymethylcellulose-saccharifying activity after heating at 100 degrees for 10 min. The enzyme was completely inactivated by 1 mM Hg2+, and partially by 1 mM Ag+ and Cu2+. The enzyme was characterized as a less-random type cellulase on the basis of its action on carboxymethylcellulose. The enzyme split cellohexaose, retaining the beta-configuration of the anomeric carbon atoms in the hydrolysis products. The Km values of cellulase III for cellooligosaccharides decreased in parallel with increase of the chain length of the substrates, while Vmax values showed a tendency to increase. The enzyme produced predominantly cellobiose and glucose from various cellulosic substrates as well as from higher cellooligosaccharides. Cellulase III preferentially attacked the aglycone linkage of p-nitrophenyl beta-D-cellobioside. The enzyme was found to catalyze the rapid synthesis of cellotetraose from cellobiose (condensation action). | Enzymatic studies on a cellulase system of Trichoderma viride. IV. Purification and properties of a less-random type cellulase. A cellulase [EC 3.2.1.4] component was purified from a crude cellulase preparation of Trichoderma viride (Meicelase) by consecutive column chromatography procedures, and was designated as cellulase III. The enzyme was homogeneous on polyacrylamide gel disc electrophoresis. The molecular weight of the enzyme was estimated to be about 45,000 by gel filtration. The optimum pH and temperature of the enzyme were pH 4.5-5.0 and 50 degrees, respectively. The enzyme was stable over the range of pH 4.5-7.5 at 4 degrees for 24 hr, and retained 40% of the original carboxymethylcellulose-saccharifying activity after heating at 100 degrees for 10 min. The enzyme was completely inactivated by 1 mM Hg2+, and partially by 1 mM Ag+ and Cu2+. The enzyme was characterized as a less-random type cellulase on the basis of its action on carboxymethylcellulose. The enzyme split cellohexaose, retaining the beta-configuration of the anomeric carbon atoms in the hydrolysis products. The Km values of cellulase III for cellooligosaccharides decreased in parallel with increase of the chain length of the substrates, while Vmax values showed a tendency to increase. The enzyme produced predominantly cellobiose and glucose from various cellulosic substrates as well as from higher cellooligosaccharides. Cellulase III preferentially attacked the aglycone linkage of p-nitrophenyl beta-D-cellobioside. The enzyme was found to catalyze the rapid synthesis of cellotetraose from cellobiose (condensation action). | [
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|
PMID:12154 | Metabolism of triacylglycerol in Mycobacterium smegmatis. | Mycobacterium smegmatis cells incorporated [1-14C]oleic acid into triacylglycerols (TG) from the medium more rapidly than shorter chain fatty acids, caprilic and butyric acids. This incorporation was inhibited more strongly by 10(-3) M N-ethylmaleimide than by 10(-3) M KCN. [14C]TG in the bacterial cells was utilized when the cells were in poor nutritional conditions, such as phosphate buffer (pH 7.0) containing oleic acid. Accumulation of TG was observed in the cells at late stages of growth. Diglyceride acyltransferase [EC 2.3.1.20] activity was detected in a cell-free extract from this bacterium. The pH optimum of this enzyme was between pH 7 and 9. F- and Tween 20 showed remarkable enhancing and inhibitory effects, respectively. | Metabolism of triacylglycerol in Mycobacterium smegmatis. Mycobacterium smegmatis cells incorporated [1-14C]oleic acid into triacylglycerols (TG) from the medium more rapidly than shorter chain fatty acids, caprilic and butyric acids. This incorporation was inhibited more strongly by 10(-3) M N-ethylmaleimide than by 10(-3) M KCN. [14C]TG in the bacterial cells was utilized when the cells were in poor nutritional conditions, such as phosphate buffer (pH 7.0) containing oleic acid. Accumulation of TG was observed in the cells at late stages of growth. Diglyceride acyltransferase [EC 2.3.1.20] activity was detected in a cell-free extract from this bacterium. The pH optimum of this enzyme was between pH 7 and 9. F- and Tween 20 showed remarkable enhancing and inhibitory effects, respectively. | [
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PMID:12155 | Hydrogen-deuterium exchange in the histidine residues of bovine alpha-lactalbumin. | The proton magnetic resonance spectrum of bovine alpha-lactalbumin has been observed, and three peaks assignable to the position-2 CH protons of the three histidine rpsidues (His 32, 68, and 107) of this protein have been subjected to detailed examination. The assignments of these peaks to His 32, 68, and 107 were made on the basis of the difference in their reactivities with iodoacetic acid. The rate constants of the hydrogen-deuterium exchange reactions were found to be 8.0 X 10(-5), 2.6 X 10(-4), and 8.0 X 10(-5) min-1, respectively, at pH 8.5 and at 35 degrees, while at 62 degrees all three were found to be 0.84 approximately 1.1 X 10(-2) min-1. On the basis of these data, it has been shown that, in the native form of this protein, His 68 is the most exposed to the solvent while His 32 and His 107 are buried slightly deeper in the surface of the molecule. The fluctuation amplitudes gamma, or the effective chances of His 32, 68, and 107 to be fully exposed to the solvent, were found to be 0.4, 1.3, and 0.4, respectively. | Hydrogen-deuterium exchange in the histidine residues of bovine alpha-lactalbumin. The proton magnetic resonance spectrum of bovine alpha-lactalbumin has been observed, and three peaks assignable to the position-2 CH protons of the three histidine rpsidues (His 32, 68, and 107) of this protein have been subjected to detailed examination. The assignments of these peaks to His 32, 68, and 107 were made on the basis of the difference in their reactivities with iodoacetic acid. The rate constants of the hydrogen-deuterium exchange reactions were found to be 8.0 X 10(-5), 2.6 X 10(-4), and 8.0 X 10(-5) min-1, respectively, at pH 8.5 and at 35 degrees, while at 62 degrees all three were found to be 0.84 approximately 1.1 X 10(-2) min-1. On the basis of these data, it has been shown that, in the native form of this protein, His 68 is the most exposed to the solvent while His 32 and His 107 are buried slightly deeper in the surface of the molecule. The fluctuation amplitudes gamma, or the effective chances of His 32, 68, and 107 to be fully exposed to the solvent, were found to be 0.4, 1.3, and 0.4, respectively. | [
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|
PMID:12156 | The structure and function of acid proteases. VI. Effects of acid protease-specific inhibitors on the acid proteases from Aspergillus niger var. macrosporus. | 1. The Type B acid protease from Aspergillus niger var. macrosporus was inactivated by reaction with diazoacetyl-DL-norleucine methyl ester (DAN), DL-1-diazo-3-tosylamido-2-heptanone (DTH), and L-1-diazo-3-tosylamido-4-phenyl-2-butanone (DTPB) in the presence of cupric ions. The reaction with DAN took place with 1:1 stoichiometry. The enzyme was also inactivated by reaction with 1, 2-epoxy-3-(p-nitrophenoxy)-propane (EPNP) with concomitant incorporation of approximately two EPNP molecules per molecule of protein. Moreover, these reactions of DAN and of EPNP were markedly inhibited by pepstatin. These results seem to indicate that, as in the case of porcine pepsin [EC 3.4.23.1] and related acid proteases, the enzyme has two essential carboxyl groups at the active site, one reactive with DAN and related diazo reagents in the presence of cupric ions and the other reactive with EPNP, and that pepstatin binds in the vicinity of these residues. 2. The Type A acid protease from the same mold, on the other hand, was found to be markedly less sensitive to these specific inhibitors. Under conditions where the Type B enzyme was completely inactivated by DAN and related diazo reagents, only partial inactivation of this enzyme occurred. The effect of prior mixing of DAN and cupric ions on the pH profile of inactivation was also different from that for the Type B enzyme. Moreover, the Type A enzyme was not inactivated by EPNP. These results thus indicate that the nature of the active site of the Type A enzyme is rather different from that of the Type B enzyme and hence that the Type A enzyme belongs to a different class of acid proteases from the Type B enzyme. | The structure and function of acid proteases. VI. Effects of acid protease-specific inhibitors on the acid proteases from Aspergillus niger var. macrosporus. 1. The Type B acid protease from Aspergillus niger var. macrosporus was inactivated by reaction with diazoacetyl-DL-norleucine methyl ester (DAN), DL-1-diazo-3-tosylamido-2-heptanone (DTH), and L-1-diazo-3-tosylamido-4-phenyl-2-butanone (DTPB) in the presence of cupric ions. The reaction with DAN took place with 1:1 stoichiometry. The enzyme was also inactivated by reaction with 1, 2-epoxy-3-(p-nitrophenoxy)-propane (EPNP) with concomitant incorporation of approximately two EPNP molecules per molecule of protein. Moreover, these reactions of DAN and of EPNP were markedly inhibited by pepstatin. These results seem to indicate that, as in the case of porcine pepsin [EC 3.4.23.1] and related acid proteases, the enzyme has two essential carboxyl groups at the active site, one reactive with DAN and related diazo reagents in the presence of cupric ions and the other reactive with EPNP, and that pepstatin binds in the vicinity of these residues. 2. The Type A acid protease from the same mold, on the other hand, was found to be markedly less sensitive to these specific inhibitors. Under conditions where the Type B enzyme was completely inactivated by DAN and related diazo reagents, only partial inactivation of this enzyme occurred. The effect of prior mixing of DAN and cupric ions on the pH profile of inactivation was also different from that for the Type B enzyme. Moreover, the Type A enzyme was not inactivated by EPNP. These results thus indicate that the nature of the active site of the Type A enzyme is rather different from that of the Type B enzyme and hence that the Type A enzyme belongs to a different class of acid proteases from the Type B enzyme. | [
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PMID:12157 | Pepsinogen C and pepsin C from gastric mucosa of Japanese monkey. Purification and characterization. | A new pepsinogen component, pepsinogen C, was purified from the gastric mucosa of Japanese monkey. The chromatographic behavior of this component on DE-32 cellulose was coincident with that of pepsinogen III-2 previously reported (1), and final purification was performed by large-scale polyacrylamide disc gel electrophoresis. The molecular weight was 35,000 as determined by gel filtration. The ratios of glutamic acid to aspartic acid and of leucine to isoleucine were higher than those of other Japanese monkey pepsinogens. The activated form, pepsin C, had a molecular weight of 27,000 and contained a large number of glutamic acid residues. The optimal pH for hemoglobin digestion was 3.0. Pepsin C could scarcely hydrolyze the synthetic substrate, N-acetyl-L-phenylalanyl-3, 5-diiodo-L-tyrosine (APDT). 1, 2-Epoxy-3-(p-nitrophenoxy)propane (EPNP), p-bromophenacyl bromide, and diazoacetyl-DL-norleucine methyl ester (DAN) inhibited pepsin C [EC 3.4.23.3] in the same way as pepsin III-3 of Japanese monkey. The susceptibility to pepstatin of pepsin C was lower than that of pepsin III-3, and 500 times more pepstatin was required for the same inhibitory effect. The classification and nomenclature of Japanese monkey pepsinogens and pepsins are discussed. | Pepsinogen C and pepsin C from gastric mucosa of Japanese monkey. Purification and characterization. A new pepsinogen component, pepsinogen C, was purified from the gastric mucosa of Japanese monkey. The chromatographic behavior of this component on DE-32 cellulose was coincident with that of pepsinogen III-2 previously reported (1), and final purification was performed by large-scale polyacrylamide disc gel electrophoresis. The molecular weight was 35,000 as determined by gel filtration. The ratios of glutamic acid to aspartic acid and of leucine to isoleucine were higher than those of other Japanese monkey pepsinogens. The activated form, pepsin C, had a molecular weight of 27,000 and contained a large number of glutamic acid residues. The optimal pH for hemoglobin digestion was 3.0. Pepsin C could scarcely hydrolyze the synthetic substrate, N-acetyl-L-phenylalanyl-3, 5-diiodo-L-tyrosine (APDT). 1, 2-Epoxy-3-(p-nitrophenoxy)propane (EPNP), p-bromophenacyl bromide, and diazoacetyl-DL-norleucine methyl ester (DAN) inhibited pepsin C [EC 3.4.23.3] in the same way as pepsin III-3 of Japanese monkey. The susceptibility to pepstatin of pepsin C was lower than that of pepsin III-3, and 500 times more pepstatin was required for the same inhibitory effect. The classification and nomenclature of Japanese monkey pepsinogens and pepsins are discussed. | [
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|
PMID:12158 | [Dissolution kinetics of synthetic hydroxyapatite and human enamel crystals]. | A comparative study of the dissolution of synthetic hydroxyapatite and human enamel crystals has been realized in a buffered (sodium citrate - citric acid) solution in presence of variable quantities of sodium fluoride. The pH of the solutions used was 3.7 and 5.6. The dissolution curves of the synthetic hydroxyapatite and the human enamel crystals were similar. In all cases, the dissolution mechanism was characterized by a first step with a rapid kinetic corresponding to the formation of a central cavity extending parallel to the c axis of the apatite crystal and observed with the electron microscope. In a second stage, the dissolution kinetic was much slower corresponding to a saturation of the buffered solution and an extension of the crystal destruction towards its lateral external surfaces. The dissolution kinetic was faster in a more acidic solution and the total dissolution at a given moment varied inversely to the fluoride amount. | [Dissolution kinetics of synthetic hydroxyapatite and human enamel crystals]. A comparative study of the dissolution of synthetic hydroxyapatite and human enamel crystals has been realized in a buffered (sodium citrate - citric acid) solution in presence of variable quantities of sodium fluoride. The pH of the solutions used was 3.7 and 5.6. The dissolution curves of the synthetic hydroxyapatite and the human enamel crystals were similar. In all cases, the dissolution mechanism was characterized by a first step with a rapid kinetic corresponding to the formation of a central cavity extending parallel to the c axis of the apatite crystal and observed with the electron microscope. In a second stage, the dissolution kinetic was much slower corresponding to a saturation of the buffered solution and an extension of the crystal destruction towards its lateral external surfaces. The dissolution kinetic was faster in a more acidic solution and the total dissolution at a given moment varied inversely to the fluoride amount. | [
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|
PMID:12159 | Human epidermal transglutaminase. Preparation and properties. | A transglutaminase from human hair follicle-free epidermis was purified to homogeneity using gel filtration and ion exchange chromatography. The enzyme had an apparent Mr = 51,000 +/- 2,000 by sodium dodecyl sulfate electrophoresis, 100,000 +/- 5,000 by discontinuous gel electrophoresis, and 50,000 +/- 2,000 by gel filtration in Bio-Gel A-0.5m agarose. The enzyme cross-linked Factor XIII-free fibrinogen forming gamma dimers and alpha polymers. Either calcium or strontium was necessary for enzyme activity. In the presence of calcium, enzyme activity was increased by heating at 56 degrees or by treating with dimethylsulfoxide. Activation required calcium and occurred in the presence of serine protease inhibitors. The activated and native enzyme had apparently identical mobilities in acrylamide disc electrophoresis and sodium dodecyl sulfate electrophoresis. The Km values for two substrates in the reaction, casein and putrescine, were very similar for the native and the activated enzyme. The activated enzyme had a larger elution volume on Bio-Gel A-0.5m in the presence of calcium than did the native enzyme. The detailed mechanism of activation remains to be determined. | Human epidermal transglutaminase. Preparation and properties. A transglutaminase from human hair follicle-free epidermis was purified to homogeneity using gel filtration and ion exchange chromatography. The enzyme had an apparent Mr = 51,000 +/- 2,000 by sodium dodecyl sulfate electrophoresis, 100,000 +/- 5,000 by discontinuous gel electrophoresis, and 50,000 +/- 2,000 by gel filtration in Bio-Gel A-0.5m agarose. The enzyme cross-linked Factor XIII-free fibrinogen forming gamma dimers and alpha polymers. Either calcium or strontium was necessary for enzyme activity. In the presence of calcium, enzyme activity was increased by heating at 56 degrees or by treating with dimethylsulfoxide. Activation required calcium and occurred in the presence of serine protease inhibitors. The activated and native enzyme had apparently identical mobilities in acrylamide disc electrophoresis and sodium dodecyl sulfate electrophoresis. The Km values for two substrates in the reaction, casein and putrescine, were very similar for the native and the activated enzyme. The activated enzyme had a larger elution volume on Bio-Gel A-0.5m in the presence of calcium than did the native enzyme. The detailed mechanism of activation remains to be determined. | [
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|
PMID:12160 | Activation of soluble guanylate cyclase from rat lung by incubation or by hydrogen peroxide. | A 37,000 X g supernatant fraction prepared from fat lung homogenate demonstrated a 2- to 3-fold increase in guanylate cyclase activity after incubation at 30 degrees for 30 min (preincubation). Treatment of the supernatant fraction with Triton X-100 increased activity to approximately the same extent as preincubation, but would not increase the activity after preincubation. By chromatography on Sepharose 2B, before and after preincubation, it was demonstrated that the increase in activity was only associated with the soluble guanylate cyclase, and not the particulate enzyme. Activation by preincubation required O2. It was completely inhibited by thiols such as 2-mercaptoethanol, and by bovine serum albumin, KCN, and sodium diethyldithiocarbamate. These inhibitors suggested a copper requirement for activation, and this was confirmed by demonstrating that 20 to 60 muM CuCl2 could relieve the inhibition by 0.1 mM sodium diethyldithiocarbamate. 2-Mercaptoethanol inhibition could also be reversed by removal of the thiol on a Sephadex G-25 column, however, this treatment partially activated the enzyme. Addition of 2-mercaptoethanol to a preincubated preparation would not reverse the activation. H2O2 was found to activate guanylate cyclase, either by its generation in the lung supernatant with glucose oxidase and glucose, or by its addition to a preparation in which the catalase was inhibited with KCN. KCN or bovine serum albumin was able to partially inhibit activation by glucose oxidase plus glucose, however, larger amounts of glucose oxidase could overcome that inhibition, indicating a catalytic role for Cu2+ at low H2O2 concentrations. No direct evidence for H2O2 formation during preincubation could be found, however, indirect evidence was obtained by the spectrophotometric detection of choleglobin formation from hemoglobin present in the lung supernatant fluid. The H2O2 is believed to result from the reaction of oxyhemoglobin with ascorbate. | Activation of soluble guanylate cyclase from rat lung by incubation or by hydrogen peroxide. A 37,000 X g supernatant fraction prepared from fat lung homogenate demonstrated a 2- to 3-fold increase in guanylate cyclase activity after incubation at 30 degrees for 30 min (preincubation). Treatment of the supernatant fraction with Triton X-100 increased activity to approximately the same extent as preincubation, but would not increase the activity after preincubation. By chromatography on Sepharose 2B, before and after preincubation, it was demonstrated that the increase in activity was only associated with the soluble guanylate cyclase, and not the particulate enzyme. Activation by preincubation required O2. It was completely inhibited by thiols such as 2-mercaptoethanol, and by bovine serum albumin, KCN, and sodium diethyldithiocarbamate. These inhibitors suggested a copper requirement for activation, and this was confirmed by demonstrating that 20 to 60 muM CuCl2 could relieve the inhibition by 0.1 mM sodium diethyldithiocarbamate. 2-Mercaptoethanol inhibition could also be reversed by removal of the thiol on a Sephadex G-25 column, however, this treatment partially activated the enzyme. Addition of 2-mercaptoethanol to a preincubated preparation would not reverse the activation. H2O2 was found to activate guanylate cyclase, either by its generation in the lung supernatant with glucose oxidase and glucose, or by its addition to a preparation in which the catalase was inhibited with KCN. KCN or bovine serum albumin was able to partially inhibit activation by glucose oxidase plus glucose, however, larger amounts of glucose oxidase could overcome that inhibition, indicating a catalytic role for Cu2+ at low H2O2 concentrations. No direct evidence for H2O2 formation during preincubation could be found, however, indirect evidence was obtained by the spectrophotometric detection of choleglobin formation from hemoglobin present in the lung supernatant fluid. The H2O2 is believed to result from the reaction of oxyhemoglobin with ascorbate. | [
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|
PMID:12161 | Control of phosphofructokinase from rat skeletal muscle. Effects of fructose diphosphate, AMP, ATP, and citrate. | Under conditions used previously for demonstrating glycolytic oscillations in muscle extracts (pH 6.65, 0.1 to 0.5 mM ATP), phosphofructokinase from rat skeletal muscle is strongly activated by micromolar concentrations of fructose diphosphate. The activation is dependent on the presence of AMP. Activation by fructose diphosphate and AMP, and inhibition by ATP, is primarily due to large changes in the apparent affinity of the enzyme for the substrate fructose 6-phosphate. These control properties can account for the generation of glycolytic oscillations. The enzyme was also studied under conditions approximating the metabolite contents of skeletal muscle in vivo (pH 7.0, 10mM ATP, 0.1 mM fructose 6-phosphate). Under these more inhibitory conditions, phosphofructokinase is strongly activated by low concentrations of fructose diphosphate, with half-maximal activation at about 10 muM. Citrate is a potent inhibitor at physiological concentrations, whereas AMP is a strong activator. Both AMP and citrate affect the maximum velocity and have little effect on affinity of the enzyme for fructose diphosphate. | Control of phosphofructokinase from rat skeletal muscle. Effects of fructose diphosphate, AMP, ATP, and citrate. Under conditions used previously for demonstrating glycolytic oscillations in muscle extracts (pH 6.65, 0.1 to 0.5 mM ATP), phosphofructokinase from rat skeletal muscle is strongly activated by micromolar concentrations of fructose diphosphate. The activation is dependent on the presence of AMP. Activation by fructose diphosphate and AMP, and inhibition by ATP, is primarily due to large changes in the apparent affinity of the enzyme for the substrate fructose 6-phosphate. These control properties can account for the generation of glycolytic oscillations. The enzyme was also studied under conditions approximating the metabolite contents of skeletal muscle in vivo (pH 7.0, 10mM ATP, 0.1 mM fructose 6-phosphate). Under these more inhibitory conditions, phosphofructokinase is strongly activated by low concentrations of fructose diphosphate, with half-maximal activation at about 10 muM. Citrate is a potent inhibitor at physiological concentrations, whereas AMP is a strong activator. Both AMP and citrate affect the maximum velocity and have little effect on affinity of the enzyme for fructose diphosphate. | [
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|
PMID:12162 | Solubilized nuclear "receptors" for thyroid hormones. Physical characteristics and binding properties, evidence for multiple forms. | Tissues regulated by thyroid hormones contain chromatin-localized "receptors" that may be involved in the actions of these hormones. In this report, we describe some properties of these receptors after their solubilization from rat liver nuclei and their separation from nucleic acids and basic proteins. The nuclear extract and partially purified preparations contain a dominant class of binding sites which have a high affinity for triiodothyronine (3,5,3'-triiodo-L-thyronine, Kd approximately 1 nM) and for the biologically potent isopropyl diiodothyronine (3,5-diiodo-3'-isopropyl-L-thyronine, Kd congruent to 1 nM) and also bind thyroxine (3,5,3',5'-tetraiodo-L-thyronine, Kd approximately 5 nM) and reverse triiodothyronine (3,3',5'-triiodo-L-thyronine, Kd approximately nM). This binding activity elutes on Sephadex G-100 in an included peak which has a Stokes radius of 35 A and sediments on glycerol gradients at 3.5 S. From these data a molecular weight ratio of 50,500 and a frictional ratio of 1.4 were calculated, suggesting that the receptor is somewhat asymmetrical. There was a sharp decline in triiodothyronine binding by this component above pH 8.7 (optimum around pH 7.6) where there is marked dissociation of the 4' phenolic hydroxyl of triiodothyronine (pKalpha approximately 8.5). A similar decrease in thyroxine (pKalpha approximately 6.7) binding with pH increases in this range was not observed. Thus, ionization of the phenolic hydroxyl may influence binding. The solubilized preparations can also contain a minor specific-binding component that can be identified by binding analyses, and by G-100 or quaternary aminoethyl Sephadex chromatography. this component has a much lower affinity for triiodothyronine and isopropyl diiodothyronine than for thyroxine as compared to the major component. It probably has a pH optima around 6.0 and demonstrates and apparent tendency to aggregate. The minor component was not always identified by direct Scatchard analysis and may be generated in part from the major component as it was more commonly observed after storage or purification of the nuclear extract. Thus, at least two thyroid hormone-binding components can be present in extracts of purified rat liver nuclei; the minor component may be an altered form or subunit of the major component. The relative binding activities of triiodothyronine, isopropyl diiodothyronine, and thyroxine by the major component, similar to those in intact nuclei, parallel the biological potencies of these compounds, and suggest that the dominant binding is by biologically relevant receptors. Since ionization of the phenolic hydroxyl may influence binding, the lower activity of thyroxine relative to triiodothyronine may in part be due to the fact that at physiological pH, the phenolic hydroxyl of thyroxine is more dissociated than is that of triiodothyronine. The finding that this receptor is somewhat asymmetrical provides an indication of the shape of an intrinsic chromatin protein implicated in specific gene regulation... | Solubilized nuclear "receptors" for thyroid hormones. Physical characteristics and binding properties, evidence for multiple forms. Tissues regulated by thyroid hormones contain chromatin-localized "receptors" that may be involved in the actions of these hormones. In this report, we describe some properties of these receptors after their solubilization from rat liver nuclei and their separation from nucleic acids and basic proteins. The nuclear extract and partially purified preparations contain a dominant class of binding sites which have a high affinity for triiodothyronine (3,5,3'-triiodo-L-thyronine, Kd approximately 1 nM) and for the biologically potent isopropyl diiodothyronine (3,5-diiodo-3'-isopropyl-L-thyronine, Kd congruent to 1 nM) and also bind thyroxine (3,5,3',5'-tetraiodo-L-thyronine, Kd approximately 5 nM) and reverse triiodothyronine (3,3',5'-triiodo-L-thyronine, Kd approximately nM). This binding activity elutes on Sephadex G-100 in an included peak which has a Stokes radius of 35 A and sediments on glycerol gradients at 3.5 S. From these data a molecular weight ratio of 50,500 and a frictional ratio of 1.4 were calculated, suggesting that the receptor is somewhat asymmetrical. There was a sharp decline in triiodothyronine binding by this component above pH 8.7 (optimum around pH 7.6) where there is marked dissociation of the 4' phenolic hydroxyl of triiodothyronine (pKalpha approximately 8.5). A similar decrease in thyroxine (pKalpha approximately 6.7) binding with pH increases in this range was not observed. Thus, ionization of the phenolic hydroxyl may influence binding. The solubilized preparations can also contain a minor specific-binding component that can be identified by binding analyses, and by G-100 or quaternary aminoethyl Sephadex chromatography. this component has a much lower affinity for triiodothyronine and isopropyl diiodothyronine than for thyroxine as compared to the major component. It probably has a pH optima around 6.0 and demonstrates and apparent tendency to aggregate. The minor component was not always identified by direct Scatchard analysis and may be generated in part from the major component as it was more commonly observed after storage or purification of the nuclear extract. Thus, at least two thyroid hormone-binding components can be present in extracts of purified rat liver nuclei; the minor component may be an altered form or subunit of the major component. The relative binding activities of triiodothyronine, isopropyl diiodothyronine, and thyroxine by the major component, similar to those in intact nuclei, parallel the biological potencies of these compounds, and suggest that the dominant binding is by biologically relevant receptors. Since ionization of the phenolic hydroxyl may influence binding, the lower activity of thyroxine relative to triiodothyronine may in part be due to the fact that at physiological pH, the phenolic hydroxyl of thyroxine is more dissociated than is that of triiodothyronine. The finding that this receptor is somewhat asymmetrical provides an indication of the shape of an intrinsic chromatin protein implicated in specific gene regulation... | [
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PMID:12163 | Photoactivated cross-linking of proteins within the erythrocyte membrane core. | We describe the reactions of three lipophilic, photoactivated cross-linking reagents, 1,5-diazidonapthalene, 4,4'-diazidobiphenyl, and the reversible 4,4'-dithiobisphenylazide, with erythrocyte membranes. Cross-linking occurs only upon photoactivation. At pH 7 to 8, only spectrin components are cross-linked by these reagents. At pH 5.0 to 5.5 several additional membrane proteins including the major "integral" membrane proteins are also cross-linked, despite equivalent binding of the cross-linkers at neutral and acid pH. The cross-linking rates of various membrane proteins at pH 5.0 to 5.5 depend distinctly upon duration of photoactivation. Bidimensional electrophoresis of membrane proteins after cross-linking with the reversible cross-linker, 4,4'-dithiobisphenylazide, has allowed for the identification of homopolymeric products of cross-linking (e.g. dimers and tetramers of Band 3) and heterocomplexes (spectrin plus other membrane proteins). The data suggest that at reduced pH, cross-linking can proceed not only at the membrane surface but also in the membrane core. | Photoactivated cross-linking of proteins within the erythrocyte membrane core. We describe the reactions of three lipophilic, photoactivated cross-linking reagents, 1,5-diazidonapthalene, 4,4'-diazidobiphenyl, and the reversible 4,4'-dithiobisphenylazide, with erythrocyte membranes. Cross-linking occurs only upon photoactivation. At pH 7 to 8, only spectrin components are cross-linked by these reagents. At pH 5.0 to 5.5 several additional membrane proteins including the major "integral" membrane proteins are also cross-linked, despite equivalent binding of the cross-linkers at neutral and acid pH. The cross-linking rates of various membrane proteins at pH 5.0 to 5.5 depend distinctly upon duration of photoactivation. Bidimensional electrophoresis of membrane proteins after cross-linking with the reversible cross-linker, 4,4'-dithiobisphenylazide, has allowed for the identification of homopolymeric products of cross-linking (e.g. dimers and tetramers of Band 3) and heterocomplexes (spectrin plus other membrane proteins). The data suggest that at reduced pH, cross-linking can proceed not only at the membrane surface but also in the membrane core. | [
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|
PMID:12164 | Evaluation of the H+/site ratio of mitochondrial electron transport from rate measurements. | The mitochondrial H+/site ratio (i.e. the number of protons ejected per pair of electrons traversing each of the energy-conserving sites of the respiratory chain) has been evaluated employing a new experimental approach. In this method the rates of oxygen uptake and H+ ejection were measured simultaneously during the initial period of respiration evoked by addition of succinate to aerobic, rotenone-inhibited, de-energized mitochondria. Either K+, in the presence of valinomycin, or Ca2+, was used as mobile cation to dissipate the membrane potential and allow quantitative H+ ejection into the medium. The H+/site ratio observed with this method in the absence of precautions to inhibit the uptake of phosphate was close to 2.0, in agreement with values obtained using the oxygen pulse technique (Mitchell, P. and Moyle, J. (1967) Biochem. J. 105, 1147-1162). However, when phosphate movements were eliminated either by inhibition of the phosphate-hydroxide antiporter with N-ethylamaleimide or by depleting the mitochondria of their endogenous phosphate content, H+/site ratios close to 4.0 were consistently observed. This ratio was independent of the concentration of succinate, of mitochondrial protein, of pH between 6 and 8, and of ionic composition of the medium, provided that sufficient K+ (plus valinomycin) or Ca2+ were present. Specific inhibitors of the hydrolysis of endogenous ATP or transport of other ions (adenine nucleotides, tricarboxylates, HCO3-, etc.) were shown not to affect the observed H+/site ratio. Furthermore, the replacement of succinate by alpha-glycerol phosphate, a substrate which is oxidized on the outer surface of the inner membrane and thus does not need to enter the matrix, gave the same H+/site ratios as did succinate. It is concluded that the H+/site ratio of mitochondrial electron transport, when phosphate movements are eliminated, may be close to 4.0. | Evaluation of the H+/site ratio of mitochondrial electron transport from rate measurements. The mitochondrial H+/site ratio (i.e. the number of protons ejected per pair of electrons traversing each of the energy-conserving sites of the respiratory chain) has been evaluated employing a new experimental approach. In this method the rates of oxygen uptake and H+ ejection were measured simultaneously during the initial period of respiration evoked by addition of succinate to aerobic, rotenone-inhibited, de-energized mitochondria. Either K+, in the presence of valinomycin, or Ca2+, was used as mobile cation to dissipate the membrane potential and allow quantitative H+ ejection into the medium. The H+/site ratio observed with this method in the absence of precautions to inhibit the uptake of phosphate was close to 2.0, in agreement with values obtained using the oxygen pulse technique (Mitchell, P. and Moyle, J. (1967) Biochem. J. 105, 1147-1162). However, when phosphate movements were eliminated either by inhibition of the phosphate-hydroxide antiporter with N-ethylamaleimide or by depleting the mitochondria of their endogenous phosphate content, H+/site ratios close to 4.0 were consistently observed. This ratio was independent of the concentration of succinate, of mitochondrial protein, of pH between 6 and 8, and of ionic composition of the medium, provided that sufficient K+ (plus valinomycin) or Ca2+ were present. Specific inhibitors of the hydrolysis of endogenous ATP or transport of other ions (adenine nucleotides, tricarboxylates, HCO3-, etc.) were shown not to affect the observed H+/site ratio. Furthermore, the replacement of succinate by alpha-glycerol phosphate, a substrate which is oxidized on the outer surface of the inner membrane and thus does not need to enter the matrix, gave the same H+/site ratios as did succinate. It is concluded that the H+/site ratio of mitochondrial electron transport, when phosphate movements are eliminated, may be close to 4.0. | [
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|
PMID:12165 | Nuclear magnetic resonance studies of sperm whale myoglobin specifically enriched with 13C in the methionine methyl groups. | The Cepsilon methyl group of the 2 methionine residues in sperm whale myoglobin was enriched with respect to 13C. This was accomplished by treatment of the apomyoglobin at pH 4 at room temperature with a 100-fold proportion of 13CH3I to form an intermediate containing enriched S-methylmethionine. Unselective demethylation to regain the apomyoglobin structure was accomplished by treatment at pH 10.5 with 0.5 M dithioerythritol at 37 degrees for 18 h. Reagents were removed at each stage by dialysis against dilute sodium azide solution. Hemin was reincorporated to form the holoprotein in a way that avoided the presence of an excess of the small molecule. After chromatographic purification the enriched myoglobin was obtained in a yield of between 29 and 60%. The composition, absorbance spectrum, circular dichroism spectrum, isoionic point, electrophoretic behavior, and oxygen-binding behavior following reduction were all indistinguishable from those of the virgin protein. NMR measurements were made at 15.1, 25.2, and 67.9 MHz at 27-30 degrees. The two enriched loci are represented by separate resonances that appear slightly downfield of the spectral position of the corresponding resonance in free methionine. The positions of these resonances are sensitive to pH and to the ligand bound at the heme group which is approximately 17 A distant from each methionine Cepsilon. On the basis of two separate types of experiment the downfield resonance was assigned to methionine 55 and the upfield resonance to methionine 131. Part of the observed variations in chemical shift could be treated as arising from pseudocontact interactions but part was ascribed to structural changes communicated to the environment of each methionine residue as a result of changes in heme ligand, pH, or temperature. The linewidths of the methionine Cepsilon resonances are narrowed by increasing temperature according to an Arrhenius energy of activation of nearly 3 kcal. The spin-lattice relaxation times, T1, of the two methionine Cepsilon resonances at the three spectrometer frequencies were interpreted to indicate the existence of rotational motions in each side chain in addition to that about the Sdelta-Cepsilon bond. The results as a whole show that the two methionine side chains undergo continuous variations in environment, and that these variations are controlled by events at a distance within the protein structure. It is suggested that the structural lability serves the function of facilitating conformational variations and adjustments within the heme pocket. | Nuclear magnetic resonance studies of sperm whale myoglobin specifically enriched with 13C in the methionine methyl groups. The Cepsilon methyl group of the 2 methionine residues in sperm whale myoglobin was enriched with respect to 13C. This was accomplished by treatment of the apomyoglobin at pH 4 at room temperature with a 100-fold proportion of 13CH3I to form an intermediate containing enriched S-methylmethionine. Unselective demethylation to regain the apomyoglobin structure was accomplished by treatment at pH 10.5 with 0.5 M dithioerythritol at 37 degrees for 18 h. Reagents were removed at each stage by dialysis against dilute sodium azide solution. Hemin was reincorporated to form the holoprotein in a way that avoided the presence of an excess of the small molecule. After chromatographic purification the enriched myoglobin was obtained in a yield of between 29 and 60%. The composition, absorbance spectrum, circular dichroism spectrum, isoionic point, electrophoretic behavior, and oxygen-binding behavior following reduction were all indistinguishable from those of the virgin protein. NMR measurements were made at 15.1, 25.2, and 67.9 MHz at 27-30 degrees. The two enriched loci are represented by separate resonances that appear slightly downfield of the spectral position of the corresponding resonance in free methionine. The positions of these resonances are sensitive to pH and to the ligand bound at the heme group which is approximately 17 A distant from each methionine Cepsilon. On the basis of two separate types of experiment the downfield resonance was assigned to methionine 55 and the upfield resonance to methionine 131. Part of the observed variations in chemical shift could be treated as arising from pseudocontact interactions but part was ascribed to structural changes communicated to the environment of each methionine residue as a result of changes in heme ligand, pH, or temperature. The linewidths of the methionine Cepsilon resonances are narrowed by increasing temperature according to an Arrhenius energy of activation of nearly 3 kcal. The spin-lattice relaxation times, T1, of the two methionine Cepsilon resonances at the three spectrometer frequencies were interpreted to indicate the existence of rotational motions in each side chain in addition to that about the Sdelta-Cepsilon bond. The results as a whole show that the two methionine side chains undergo continuous variations in environment, and that these variations are controlled by events at a distance within the protein structure. It is suggested that the structural lability serves the function of facilitating conformational variations and adjustments within the heme pocket. | [
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|
PMID:12166 | Investigation of microsomal oxygenases of biosynthetic processes. Stearyl-CoA desaturase of adipose tissue and liver. | Porcine and rat microsomal stearyl-CoA desaturases require reduced pyridine nucleotide and oxygen, are cyanide sensitive, and are insensitive to carbon monoxide. The Km for stearyl-CoA is somewhat larger for liver than for the adipose desaturases, but, in general, assay conditions are quite similar. Adipose tissue microsomes contain cytochromes b5 and P-450, as well as the NADH- and NADPH-specific cytochrome reductases. Compared to liver, the specific contents and activities of electron carriers are much lower in adipose tissue, and activities of 4-methyl sterol oxidase of cholesterol biosynthesis, as well as the cytochrome P-450-dependent aminopyrene demethylase and benzypyrene hydroxylase, are negligible in adipose tissue microsomes. Furthermore, unlike hepatic desaturase, administration of insulin stimulates the adipose desaturase 3-fold without affecting either the amounts or activities of microsomal oxidation-reduction proteins; the changes in desaturase activities produced either by altering dietary fat or by fasting and/or fasting followed by refeeding are, in general, both more extensive and more permanent in adipose compared to liver microsomes. The effects produced by isotopic hydrogen substitution both in stearyl-CoA and in the medium (2H2O) are similar with microsomes from both tissues. The rate-determining step of desaturase appears to be similar in both tissues. The primary isotope effect, k H/Tr, observed with [9,10-3H2]stearyl-CoA is relatively small, 2.88. Since little, if any, primary isotope effect is associated with methyl sterol oxidase, these two mixed function oxidases of biosynthetic processes also appear to share this property in common. | Investigation of microsomal oxygenases of biosynthetic processes. Stearyl-CoA desaturase of adipose tissue and liver. Porcine and rat microsomal stearyl-CoA desaturases require reduced pyridine nucleotide and oxygen, are cyanide sensitive, and are insensitive to carbon monoxide. The Km for stearyl-CoA is somewhat larger for liver than for the adipose desaturases, but, in general, assay conditions are quite similar. Adipose tissue microsomes contain cytochromes b5 and P-450, as well as the NADH- and NADPH-specific cytochrome reductases. Compared to liver, the specific contents and activities of electron carriers are much lower in adipose tissue, and activities of 4-methyl sterol oxidase of cholesterol biosynthesis, as well as the cytochrome P-450-dependent aminopyrene demethylase and benzypyrene hydroxylase, are negligible in adipose tissue microsomes. Furthermore, unlike hepatic desaturase, administration of insulin stimulates the adipose desaturase 3-fold without affecting either the amounts or activities of microsomal oxidation-reduction proteins; the changes in desaturase activities produced either by altering dietary fat or by fasting and/or fasting followed by refeeding are, in general, both more extensive and more permanent in adipose compared to liver microsomes. The effects produced by isotopic hydrogen substitution both in stearyl-CoA and in the medium (2H2O) are similar with microsomes from both tissues. The rate-determining step of desaturase appears to be similar in both tissues. The primary isotope effect, k H/Tr, observed with [9,10-3H2]stearyl-CoA is relatively small, 2.88. Since little, if any, primary isotope effect is associated with methyl sterol oxidase, these two mixed function oxidases of biosynthetic processes also appear to share this property in common. | [
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PMID:12167 | Effect of organic phosphates on methemoglobin reduction by ascorbic acid. | The rate of methemoglobin reduction by ascorbic acid was accelerated in the presence of ATP,2,3-diphosphoglycerate (2,3-DPG), and inositol hexaphosphate (IHP). The acceleration was as much as three times, four times, and ten times in the presence of ATP, 2.3-DPG, and IHP at pH 7.0, respectively. The changes of the concentrations of methemoglobin and ascorbic acid during the methemoglobin reduction were determined, and the reaction was found to proceed stoichiometrically in the presence of IHP. The reduction rate of methemoglobin by ascorbic acid was compared at different concentrations of organic phosphates (ATP,2,3-DPG, and IHP) at various pH values (6.3, 7.0, 7.7). From the changes in the reduction rate under different concentrations of organic phosphates, the dissociation constants of ATP, 2,3-DPG, and IHP to methemoglobin could be determined and were estimated to be 3.3 X 10(-4) M, 2 X 10(-3) M, and 8 X 10(-6) M at pH 7.0, respectively. On the basis of these results, the acceleration mechanism of methemoglobin reduction by ascorbic acid due to the presence of organic phosphates was described. The physiological role of 2,3-DPG in human red cells was discussed in relation to the reduction of methemoglobin by ascorbic acid. | Effect of organic phosphates on methemoglobin reduction by ascorbic acid. The rate of methemoglobin reduction by ascorbic acid was accelerated in the presence of ATP,2,3-diphosphoglycerate (2,3-DPG), and inositol hexaphosphate (IHP). The acceleration was as much as three times, four times, and ten times in the presence of ATP, 2.3-DPG, and IHP at pH 7.0, respectively. The changes of the concentrations of methemoglobin and ascorbic acid during the methemoglobin reduction were determined, and the reaction was found to proceed stoichiometrically in the presence of IHP. The reduction rate of methemoglobin by ascorbic acid was compared at different concentrations of organic phosphates (ATP,2,3-DPG, and IHP) at various pH values (6.3, 7.0, 7.7). From the changes in the reduction rate under different concentrations of organic phosphates, the dissociation constants of ATP, 2,3-DPG, and IHP to methemoglobin could be determined and were estimated to be 3.3 X 10(-4) M, 2 X 10(-3) M, and 8 X 10(-6) M at pH 7.0, respectively. On the basis of these results, the acceleration mechanism of methemoglobin reduction by ascorbic acid due to the presence of organic phosphates was described. The physiological role of 2,3-DPG in human red cells was discussed in relation to the reduction of methemoglobin by ascorbic acid. | [
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|
PMID:12169 | pH-dependent effects of Cr(NH3)2ATP on kinetics of yeast hexokinase PII. Relationship to the slow transition mechanism. | The effect of Cr(NH3)2ATP, a virtually inert, inner sphere metal-ligand complex, on the kinetics of purified yeast hexokinase PII has been studied at pH 6.5 and pH 7.5. At pH 6.5, where the normal assays exhibit a slow burst-type transient, low concentrations of Cr(NH3)2ATP were found to activate both phii, the initial velocity, and phiII, the steady state velocity. At higher concentrations, Cr(NH3)2ATP was found to be a competitive inhibitor versus MgATP for both phii and phiII. The apparent Ki values for both velocities were the same. The inhibition by Cr(NH3)2ATP at pH 6.5 was found to be a slow process with half-times similar to those found for the normal burst-type transient at this pH value. At pH 7.5, where normal assays exhibit linear progress curves, Cr(NH3)2ATP behaved similarly to that observed before at pH 7 (Danenberg, D. D., and Cleland, W. W. (1975) Biochemistry 14, 28-39), i.e. it was a competitive inhibitor versus MgATP and it caused a slowing of the reaction rate over the first several minutes. The apparent Ki for the initial velocity was 8-fold higher than the apparent Ki for the steady state velocity, suggesting tighter binding of Cr(NH3)2ATP with time. Preincubation experiments indicated that the normal pH 6.5 burst-type transient could be eliminated by appropriate preincubation with Cr(NH3)2ATP and a sugar. In agreement with Danenberg and Cleland (1975), similar preincubations have been shown to produce linear assays at pH 7.5 in the presence of Cr(NH3)2ATP. Similar results were seen with MgITP as the nucleotide substrate, where a burst-type transient is not seen at either pH value under normal assay conditions. At pH 7.5, a slow decrease in the reaction rate is seen over the first several minutes in the presence of Cr(NH3)2ATP. The apparent Ki for phii was 7-fold higher than the apparent Ki value for phiII, again suggesting a tighter binding of Cr(NH3)2ATP with time. A similar observation was made at pH 6.5, but the Ki values for phii and phiII were the same, suggesting no tightening of the binding of Cr(NH3)2ATP with time at this pH value. These results suggested that both slow processes reflect the same basic molecular change, but the consequences are different at the two pH values, presumably because of the difference in the charge of the enzyme. The Cr(NH3)2ATP kinetics at pH 6.5 have been interpreted in terms of a modification of the slow transition mechanism for hexokinase (Shill, J. P., and Neet, K. E. (1975) J. Biol. Chem. 250, 2259-2268). It is postulated that glucose and Cr(NH3)2ATP induce the same slow conformational change at pH 6.5 as that induced by glucose and MgATP, which gives rise to the normal burst-type transient. This suggests that Cr(NH3)2ATP may be a useful tool for physical studies to determine the cause of the slow transition of yeast hexokinase. Activation by low concentrations of Cr(NH3)2ATP was interpreted as binding of the nucleotide to an activator site on the enzyme, causing a shift in the distribution of enzyme towards the more active form. | pH-dependent effects of Cr(NH3)2ATP on kinetics of yeast hexokinase PII. Relationship to the slow transition mechanism. The effect of Cr(NH3)2ATP, a virtually inert, inner sphere metal-ligand complex, on the kinetics of purified yeast hexokinase PII has been studied at pH 6.5 and pH 7.5. At pH 6.5, where the normal assays exhibit a slow burst-type transient, low concentrations of Cr(NH3)2ATP were found to activate both phii, the initial velocity, and phiII, the steady state velocity. At higher concentrations, Cr(NH3)2ATP was found to be a competitive inhibitor versus MgATP for both phii and phiII. The apparent Ki values for both velocities were the same. The inhibition by Cr(NH3)2ATP at pH 6.5 was found to be a slow process with half-times similar to those found for the normal burst-type transient at this pH value. At pH 7.5, where normal assays exhibit linear progress curves, Cr(NH3)2ATP behaved similarly to that observed before at pH 7 (Danenberg, D. D., and Cleland, W. W. (1975) Biochemistry 14, 28-39), i.e. it was a competitive inhibitor versus MgATP and it caused a slowing of the reaction rate over the first several minutes. The apparent Ki for the initial velocity was 8-fold higher than the apparent Ki for the steady state velocity, suggesting tighter binding of Cr(NH3)2ATP with time. Preincubation experiments indicated that the normal pH 6.5 burst-type transient could be eliminated by appropriate preincubation with Cr(NH3)2ATP and a sugar. In agreement with Danenberg and Cleland (1975), similar preincubations have been shown to produce linear assays at pH 7.5 in the presence of Cr(NH3)2ATP. Similar results were seen with MgITP as the nucleotide substrate, where a burst-type transient is not seen at either pH value under normal assay conditions. At pH 7.5, a slow decrease in the reaction rate is seen over the first several minutes in the presence of Cr(NH3)2ATP. The apparent Ki for phii was 7-fold higher than the apparent Ki value for phiII, again suggesting a tighter binding of Cr(NH3)2ATP with time. A similar observation was made at pH 6.5, but the Ki values for phii and phiII were the same, suggesting no tightening of the binding of Cr(NH3)2ATP with time at this pH value. These results suggested that both slow processes reflect the same basic molecular change, but the consequences are different at the two pH values, presumably because of the difference in the charge of the enzyme. The Cr(NH3)2ATP kinetics at pH 6.5 have been interpreted in terms of a modification of the slow transition mechanism for hexokinase (Shill, J. P., and Neet, K. E. (1975) J. Biol. Chem. 250, 2259-2268). It is postulated that glucose and Cr(NH3)2ATP induce the same slow conformational change at pH 6.5 as that induced by glucose and MgATP, which gives rise to the normal burst-type transient. This suggests that Cr(NH3)2ATP may be a useful tool for physical studies to determine the cause of the slow transition of yeast hexokinase. Activation by low concentrations of Cr(NH3)2ATP was interpreted as binding of the nucleotide to an activator site on the enzyme, causing a shift in the distribution of enzyme towards the more active form. | [
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PMID:12170 | Catalytic mechanisms of glutamine synthetase enzymes. Studies with analogs of possible intermediates and transition states. | Glutamine synthetase enzymes isolated from pea seeds and from Escherichia coli are observed to behave differently in experiments designed to probe reaction mechanism. Although both enzymes were found to bind and release substrates in random order mechanisms (Wedler, F.C. (1974) J. Biol. Chem, 247, 5080-5087), isotopic exchanges with partial reaction systems indicative of a gamma-glutamylphosphate intermediate are catalyzed only by the pea seed enzyme. The E. coli system fails to catalyze any exchanges at appreciable rates unless all substrates are present. This negative result implies either an absolute conformational requirement for bound substrates or that the putative complex (E-Glu-P-MgADP) is exceedingly tight. To test the latter, a nonreactive structural analog of gamma-glutamyl-phosphate, namely 3-(phosphonoacetylamido)-L-alanine (PA2LA), has been synthesized. With the E. coli enzyme PA2LA was found to bind no more tightly than L-glutamate and is strictly competitive versus L-glutamate (Ki = 3 mM). Thus, failure to catalyze partial exchange reactions indicative of gamma-Glu-P is probably not attributable to tight complex formation. The binding of PA2LA with the pea seed enzyme apparently involves a two-step process: a rapid, reversible step in which PA2LA binds 10-fold more tightly than L-glutamate, followed by a slow (but reversible) process involving very tight PA2LA binding, apparently with enzyme isomerization promoted by nucleotide. The specificity of the two enzymes toward L-methionine-SR-sulfoximine, Met(O)(NH), was also different... | Catalytic mechanisms of glutamine synthetase enzymes. Studies with analogs of possible intermediates and transition states. Glutamine synthetase enzymes isolated from pea seeds and from Escherichia coli are observed to behave differently in experiments designed to probe reaction mechanism. Although both enzymes were found to bind and release substrates in random order mechanisms (Wedler, F.C. (1974) J. Biol. Chem, 247, 5080-5087), isotopic exchanges with partial reaction systems indicative of a gamma-glutamylphosphate intermediate are catalyzed only by the pea seed enzyme. The E. coli system fails to catalyze any exchanges at appreciable rates unless all substrates are present. This negative result implies either an absolute conformational requirement for bound substrates or that the putative complex (E-Glu-P-MgADP) is exceedingly tight. To test the latter, a nonreactive structural analog of gamma-glutamyl-phosphate, namely 3-(phosphonoacetylamido)-L-alanine (PA2LA), has been synthesized. With the E. coli enzyme PA2LA was found to bind no more tightly than L-glutamate and is strictly competitive versus L-glutamate (Ki = 3 mM). Thus, failure to catalyze partial exchange reactions indicative of gamma-Glu-P is probably not attributable to tight complex formation. The binding of PA2LA with the pea seed enzyme apparently involves a two-step process: a rapid, reversible step in which PA2LA binds 10-fold more tightly than L-glutamate, followed by a slow (but reversible) process involving very tight PA2LA binding, apparently with enzyme isomerization promoted by nucleotide. The specificity of the two enzymes toward L-methionine-SR-sulfoximine, Met(O)(NH), was also different... | [
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PMID:12171 | Adrenodoxin reductase-adrenodexin complex. | Adrenodoxin reductase and adrenodoxin have been shown (Chu, J.-W., and Kimura, T. (1973) J. Biol. Chem. 248, 5183-5187) to form a low dissociation constant, 1:1 complex when both proteins are in the oxidized form. We have found that when adrenodoxin: adrenodoxin reductase ratios are varied by increasing the adrenodoxin concentration, with adrenodoxin reductase held constant, an increasing rate of cytochrome c reduction, with NADPH as reductant, is seen up to a ratio of 1:1, indicating that cytochrome c reduction occurs via the protein-protein complex. Spectra observed during titration of this protein-protein complex with NADH were resolved into components by the linear programming method, using a computer program written in Fortran IV. Analysis of the data has shown that the flavoprotein is reduced prior to the iron sulfur protein, and that the midpoint oxidation-reduction potentials (pH 7.5) of the two proteins are -295 and -331 mV, respectively, when both are present in the complex. Complex formation does not alter the potential of adrenodoxin reductase, but changes that of adrenodoxin by -40 mV. Equilibrium constants derived from potential measurements show that the strength of the protein-protein interaction in the complex is unaltered by reduction of adrenodoxin reductase, but is decreased by about 1 kcal due to reduction of adrenodoxin. The low dissociation constants for both oxidized reduced forms of the adrenodoxin reductase-adrenodoxin complex indicate that the complex must remain associated throughout its catalytic cycle. Titration of the adrenodoxin reductase-adrenodoxin complex with the physiologic reductant, NADPH, was followed by EPR and visible spectra, and yielded an order of reduction of the components identical with that seen when NADH was used as reductant. Reduction of the protein-protein complex with NADPH yielded a ternary complex between NADP+, flavoprotein, and iron sulfur protein, with the two electrons located in a "charge transfer" complex between flavoprotein and pyridine nucleotide. | Adrenodoxin reductase-adrenodexin complex. Adrenodoxin reductase and adrenodoxin have been shown (Chu, J.-W., and Kimura, T. (1973) J. Biol. Chem. 248, 5183-5187) to form a low dissociation constant, 1:1 complex when both proteins are in the oxidized form. We have found that when adrenodoxin: adrenodoxin reductase ratios are varied by increasing the adrenodoxin concentration, with adrenodoxin reductase held constant, an increasing rate of cytochrome c reduction, with NADPH as reductant, is seen up to a ratio of 1:1, indicating that cytochrome c reduction occurs via the protein-protein complex. Spectra observed during titration of this protein-protein complex with NADH were resolved into components by the linear programming method, using a computer program written in Fortran IV. Analysis of the data has shown that the flavoprotein is reduced prior to the iron sulfur protein, and that the midpoint oxidation-reduction potentials (pH 7.5) of the two proteins are -295 and -331 mV, respectively, when both are present in the complex. Complex formation does not alter the potential of adrenodoxin reductase, but changes that of adrenodoxin by -40 mV. Equilibrium constants derived from potential measurements show that the strength of the protein-protein interaction in the complex is unaltered by reduction of adrenodoxin reductase, but is decreased by about 1 kcal due to reduction of adrenodoxin. The low dissociation constants for both oxidized reduced forms of the adrenodoxin reductase-adrenodoxin complex indicate that the complex must remain associated throughout its catalytic cycle. Titration of the adrenodoxin reductase-adrenodoxin complex with the physiologic reductant, NADPH, was followed by EPR and visible spectra, and yielded an order of reduction of the components identical with that seen when NADH was used as reductant. Reduction of the protein-protein complex with NADPH yielded a ternary complex between NADP+, flavoprotein, and iron sulfur protein, with the two electrons located in a "charge transfer" complex between flavoprotein and pyridine nucleotide. | [
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|
PMID:12172 | Hemoglobin providence. Functional consequences of two alterations of the 2,3-diphosphoglycerate binding site at position beta 82. | Position beta 82 in human hemoglobin (Hb) is normally occupied by lysine, a positively charged residue that is involved in the binding of anionic cofactors. This residue is substituted by a neutral residue in Hb Providence Asn and by a negatively charged residue in Hb Providence Asp. Hb Providence Asp shows more differences from Hb A than does Hb Providence Asn in studies of the kinetics and equilibria of ligand binding. For both forms, homotropic (cooperative) interactions are normal with n values of 2.5 to 2.7, while heterotropic (pH and anion) interactions are reduced greatly. The reduction in anion sensitivity is attributed to the absence of a positive residue at position beta 82. Reduction in pH sensitivity may be due to a ligand-linked change in the pK of a neighboring residue, beta 143 histidine, which normally is not a Bohr group. This change in pK would act in opposition to the normal Bohr effect. Reduction in the net positive charge of the central cavity has a further consequence. Relative to Hb A, both Hb Providence Asn and Hb Providence Asp show decreased oxygen affinities at neutral pH in the absence of cofactors. This suggests that in Hb A the binding of anionic cofactors directly influences the oxygen affinity by neutralizing the charged groups of the diphosphoglycerate binding site and thus stabilizing the low affinity (T) conformation. From pH 6 to 9 in the presence of 1 M NaCl, where all the charged groups may be masked, the oxygen-binding properties of Hb A and the Hb Providence mutants are identical. Moreover, subunit dissociation of the liganded Hb Providence mutants appears to be increased, as is known to occur for Hb A in the presence of high salt. The results obtained with Hb Providence Asn and Hb Providence Asp illustrate how single amino acid substitutions can modify hemoglobins' pH and anion interactions without altering cooperative interactions between subunits. The alteration in cofactor effects observed with these mutants also illustrates differences between the allosteric effects induced by organic and inorganic anions. | Hemoglobin providence. Functional consequences of two alterations of the 2,3-diphosphoglycerate binding site at position beta 82. Position beta 82 in human hemoglobin (Hb) is normally occupied by lysine, a positively charged residue that is involved in the binding of anionic cofactors. This residue is substituted by a neutral residue in Hb Providence Asn and by a negatively charged residue in Hb Providence Asp. Hb Providence Asp shows more differences from Hb A than does Hb Providence Asn in studies of the kinetics and equilibria of ligand binding. For both forms, homotropic (cooperative) interactions are normal with n values of 2.5 to 2.7, while heterotropic (pH and anion) interactions are reduced greatly. The reduction in anion sensitivity is attributed to the absence of a positive residue at position beta 82. Reduction in pH sensitivity may be due to a ligand-linked change in the pK of a neighboring residue, beta 143 histidine, which normally is not a Bohr group. This change in pK would act in opposition to the normal Bohr effect. Reduction in the net positive charge of the central cavity has a further consequence. Relative to Hb A, both Hb Providence Asn and Hb Providence Asp show decreased oxygen affinities at neutral pH in the absence of cofactors. This suggests that in Hb A the binding of anionic cofactors directly influences the oxygen affinity by neutralizing the charged groups of the diphosphoglycerate binding site and thus stabilizing the low affinity (T) conformation. From pH 6 to 9 in the presence of 1 M NaCl, where all the charged groups may be masked, the oxygen-binding properties of Hb A and the Hb Providence mutants are identical. Moreover, subunit dissociation of the liganded Hb Providence mutants appears to be increased, as is known to occur for Hb A in the presence of high salt. The results obtained with Hb Providence Asn and Hb Providence Asp illustrate how single amino acid substitutions can modify hemoglobins' pH and anion interactions without altering cooperative interactions between subunits. The alteration in cofactor effects observed with these mutants also illustrates differences between the allosteric effects induced by organic and inorganic anions. | [
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|
PMID:12173 | Post-proline cleaving enzyme. Purification of this endopeptidase by affinity chromatography. | The endopeptidase, post-proline cleaving enzyme, has been purified 10,500-fold in an overall yield of 18% from lamb kidney. The enzyme possesses a specific activity of 45 mumol/mg/min as tested with the substrate Z-Gly-Pro-Leu-Gly (Km = 6.0 X 10(-5)), has a molecular weight of 115,000, is comprised of two subunits with a molecular weight of 57,000, and exhibits maximal activity at pH 7.5 to 8.0. With the exception of the -Pro-Pro linkage, the -Pro-X-peptide bond (X equals L- and D-amino acid residues) located internally in the peptide sequence can be hydrolyzed (cleavage occurs faster when X = lipophilic side chain as compared to X = acidic side chain). The appropriate -Pro-X- bonds in zinc-free porcine insulin, oxytocin, arginine vasopressin, angiotensin II, bradykinin-potentiating factor were cleaved. Human gastrin, adrenocorticotropic hormone, denatured guinea pig skin collagen, and ascaris cuticle collagen were not degraded. Dipeptides with the structure Z-Pro-LD-X competitively inhibit post-proline cleaving enzyme. | Post-proline cleaving enzyme. Purification of this endopeptidase by affinity chromatography. The endopeptidase, post-proline cleaving enzyme, has been purified 10,500-fold in an overall yield of 18% from lamb kidney. The enzyme possesses a specific activity of 45 mumol/mg/min as tested with the substrate Z-Gly-Pro-Leu-Gly (Km = 6.0 X 10(-5)), has a molecular weight of 115,000, is comprised of two subunits with a molecular weight of 57,000, and exhibits maximal activity at pH 7.5 to 8.0. With the exception of the -Pro-Pro linkage, the -Pro-X-peptide bond (X equals L- and D-amino acid residues) located internally in the peptide sequence can be hydrolyzed (cleavage occurs faster when X = lipophilic side chain as compared to X = acidic side chain). The appropriate -Pro-X- bonds in zinc-free porcine insulin, oxytocin, arginine vasopressin, angiotensin II, bradykinin-potentiating factor were cleaved. Human gastrin, adrenocorticotropic hormone, denatured guinea pig skin collagen, and ascaris cuticle collagen were not degraded. Dipeptides with the structure Z-Pro-LD-X competitively inhibit post-proline cleaving enzyme. | [
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|
PMID:12174 | A new endoribonuclease from Escherichia coli. Ribonuclease N. | A new ribonuclease called RNase N was isolated from Escherichia coli. It is a nonspecific endoribonuclease that can cleave rRNA, poly(U), and poly(C) to small oligonucleotides and 5'-mononucleotides. It requires monovalent cations and is inhibited by divalent cations. It is suggested that this enzyme plays a role in the decay of rRNA,under various starvation conditions and perhaps in the decay of mRNA. | A new endoribonuclease from Escherichia coli. Ribonuclease N. A new ribonuclease called RNase N was isolated from Escherichia coli. It is a nonspecific endoribonuclease that can cleave rRNA, poly(U), and poly(C) to small oligonucleotides and 5'-mononucleotides. It requires monovalent cations and is inhibited by divalent cations. It is suggested that this enzyme plays a role in the decay of rRNA,under various starvation conditions and perhaps in the decay of mRNA. | [
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|
PMID:12175 | A nonelectrogenic H+ pump in plasma membranes of hog stomach. | Differential and density gradient centrifugation were used to prepare a vesicular membrane fraction from hog gastric mucosa enriched 17-fold with respect to cation-activated ATPase and 5'-AMPase. Fractionation of the gradient material by free flow electrophoresis resulted in a fraction 35-fold enriched in cation-activated ATPase and essentially free of 5'-AMPase and Mg2+ATPase. The addition of ATP to either fraction resulted in H+ uptake and Rb+ efflux. The ionophoric and osmotic sensitivity showed that these ion movements were due to transport rather than binding. The cation selectivity sequences, substrate specificities and action of inhibitors indicated that the transport was a function of K+ATPase activity. The characteristics of the ATP-dependent enhancement of SCN- uptake and 8-anilinonapthalene-1-sulfonate fluorescence in the presence of valinomycin and the action of ionophores and lipid-permeable ions suggested that the energy dependent K+:H+ exchange was effectively nonelectrogenic. Thus these vesicles contain a nonelectrogenic (H+ + K+)-ATPase, hence acid secretion by the stomach is probably due to an ATP-dependent H+ + K+ exchange. | A nonelectrogenic H+ pump in plasma membranes of hog stomach. Differential and density gradient centrifugation were used to prepare a vesicular membrane fraction from hog gastric mucosa enriched 17-fold with respect to cation-activated ATPase and 5'-AMPase. Fractionation of the gradient material by free flow electrophoresis resulted in a fraction 35-fold enriched in cation-activated ATPase and essentially free of 5'-AMPase and Mg2+ATPase. The addition of ATP to either fraction resulted in H+ uptake and Rb+ efflux. The ionophoric and osmotic sensitivity showed that these ion movements were due to transport rather than binding. The cation selectivity sequences, substrate specificities and action of inhibitors indicated that the transport was a function of K+ATPase activity. The characteristics of the ATP-dependent enhancement of SCN- uptake and 8-anilinonapthalene-1-sulfonate fluorescence in the presence of valinomycin and the action of ionophores and lipid-permeable ions suggested that the energy dependent K+:H+ exchange was effectively nonelectrogenic. Thus these vesicles contain a nonelectrogenic (H+ + K+)-ATPase, hence acid secretion by the stomach is probably due to an ATP-dependent H+ + K+ exchange. | [
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|
PMID:12177 | Appearance of magnesium guanylate cyclase activity in rat liver with sodium azide activation. | Native soluble and particulate guanylate cyclase from several rat tissues preferred Mn2+ to Mg2+ as the sole cation cofactor. Wtih 4mM cation, activities with Mg2+ were less than 25% of the activities with Mn2+. The 1 mM NaN3 markedly increased the activity of soluble and particulate preparations from rat liver. Wtih NaN3 activation guanylate cyclase activities wite similar with Mn2+ and Mg2+. Co2+ was partially effective as a cofactor in the presence of NaN3, while Ca2+ was a poor cation with or without NaN3. Activities with Ba, Cu2+, or Zn2+ were not detectable without or with 1 mM NaN3. With soluble liver enzyme both manganese and magnesium activities were dependent upon excess Mn2+ or Mg2+ at a fixed MnGTP or MgGTP concentration of 0.4 mm; apparent Km values for excess Mn2+ and Mg2+ were 0.3 and 0.24 mM, respectively. After NaN3 activation, the activity was less dependent upon free Mn2+ and retained its dependence for free Mg2+, at 0.4 mM MgGTP the apparent Km for excess Mg2+ was 0.3 mM. The activity of soluble liver guanylate cyclase assayed with Mn2+ or Mg2+ was increased with Ca2+. After NaN3 activiation, Ca2+ had no effect or was somewhat inhibitory with either Mn2+. After NaN activation, Ca2+ had no effect or was somewhat inhibitory with either Mn2+ or Mg2+. The stimulatory effect of NaN2 on Mn2+-and Mg2+-dependent guanylate cyclase activity from liver or cerebral cortex supernatant fractions required the presence of the sodium azide-activator factor. With partially purified soluble liver guanylate cyclase and azide-activator factor, the concentration (1 mjM) of NaN3 that gave half-maximal activation with Mn2+ or Mg2+ was imilar. Thus, under some conditions guanylate cyclase can effectively use Mg2+ as a sole cation cofactor. | Appearance of magnesium guanylate cyclase activity in rat liver with sodium azide activation. Native soluble and particulate guanylate cyclase from several rat tissues preferred Mn2+ to Mg2+ as the sole cation cofactor. Wtih 4mM cation, activities with Mg2+ were less than 25% of the activities with Mn2+. The 1 mM NaN3 markedly increased the activity of soluble and particulate preparations from rat liver. Wtih NaN3 activation guanylate cyclase activities wite similar with Mn2+ and Mg2+. Co2+ was partially effective as a cofactor in the presence of NaN3, while Ca2+ was a poor cation with or without NaN3. Activities with Ba, Cu2+, or Zn2+ were not detectable without or with 1 mM NaN3. With soluble liver enzyme both manganese and magnesium activities were dependent upon excess Mn2+ or Mg2+ at a fixed MnGTP or MgGTP concentration of 0.4 mm; apparent Km values for excess Mn2+ and Mg2+ were 0.3 and 0.24 mM, respectively. After NaN3 activation, the activity was less dependent upon free Mn2+ and retained its dependence for free Mg2+, at 0.4 mM MgGTP the apparent Km for excess Mg2+ was 0.3 mM. The activity of soluble liver guanylate cyclase assayed with Mn2+ or Mg2+ was increased with Ca2+. After NaN3 activiation, Ca2+ had no effect or was somewhat inhibitory with either Mn2+. After NaN activation, Ca2+ had no effect or was somewhat inhibitory with either Mn2+ or Mg2+. The stimulatory effect of NaN2 on Mn2+-and Mg2+-dependent guanylate cyclase activity from liver or cerebral cortex supernatant fractions required the presence of the sodium azide-activator factor. With partially purified soluble liver guanylate cyclase and azide-activator factor, the concentration (1 mjM) of NaN3 that gave half-maximal activation with Mn2+ or Mg2+ was imilar. Thus, under some conditions guanylate cyclase can effectively use Mg2+ as a sole cation cofactor. | [
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|
PMID:12178 | Synthesis of bound adenosine triphosphate from bound adenosine diphosphate by the purified coupling factor 1 of chloroplasts. Evidence for direct involvement of the coupling factor in this "adenylate kinase-like" reaction. | Electrophoretically homogeneous coupling factor 1 from spinach chloroplasts binds ADP and converts the bound ADP to bound ATP and AMP. That this transphosphorylation of enzyme-bound ADP is catalyzed by the coupling factor itself, and not be a conventional adenylate kinase which might possibly contaminate preparations of the coupling factor, is supported by the following evidence. 1. The procedure for isolatio of the coupling factor is designed to separate this large (approximately 13 S) enzyme from the smaller (4.2 S) conventional adenylate kinase of spinach chloroplasts. The conventional adenylate kinase cannot be detected in purified preparations of the coupling factor by biochemical assay or by polyacrylamide gel electrophoresis. 2. The activity of spinach adenylate kinase is completely dependent upon magnesium ions. However, the production of bound ATP and AMP from bound ADP by the coupling factor can be assayed in the total absence of added magnesium ions or even in the presence of added EDTA. 3. Comparative studies with inhibitors show that the coupling factor can produce bound ATP from ADP under conditions where the activity of adenylate kinase is strongly inhibited. Conversely, the coupling factor is prevented from synthesizing bound ATP from ADP under other conditions where the conventional adenylate kinase has high levels of activity. 4. AMP, when added in solution to the coupling factor, does not bind to this enzyme, even in the presence of APT. Thus, it is unlikely that the appearance of AMP bound to the coupling factor after its incubation with ADP is due to the production of free AMP by contaminating adenylate kinase. These results demonstrate that the isolated, homogeneous coupling factor from spinach chloroplasts has the intrinsic capacity to perform a phosphoryl group transfer between two bound ADP molecules and thus to synthesize ATP. This reaction may have an important role in the photosynthetic production of ATP by the chloroplast, as is discussed in this communication. | Synthesis of bound adenosine triphosphate from bound adenosine diphosphate by the purified coupling factor 1 of chloroplasts. Evidence for direct involvement of the coupling factor in this "adenylate kinase-like" reaction. Electrophoretically homogeneous coupling factor 1 from spinach chloroplasts binds ADP and converts the bound ADP to bound ATP and AMP. That this transphosphorylation of enzyme-bound ADP is catalyzed by the coupling factor itself, and not be a conventional adenylate kinase which might possibly contaminate preparations of the coupling factor, is supported by the following evidence. 1. The procedure for isolatio of the coupling factor is designed to separate this large (approximately 13 S) enzyme from the smaller (4.2 S) conventional adenylate kinase of spinach chloroplasts. The conventional adenylate kinase cannot be detected in purified preparations of the coupling factor by biochemical assay or by polyacrylamide gel electrophoresis. 2. The activity of spinach adenylate kinase is completely dependent upon magnesium ions. However, the production of bound ATP and AMP from bound ADP by the coupling factor can be assayed in the total absence of added magnesium ions or even in the presence of added EDTA. 3. Comparative studies with inhibitors show that the coupling factor can produce bound ATP from ADP under conditions where the activity of adenylate kinase is strongly inhibited. Conversely, the coupling factor is prevented from synthesizing bound ATP from ADP under other conditions where the conventional adenylate kinase has high levels of activity. 4. AMP, when added in solution to the coupling factor, does not bind to this enzyme, even in the presence of APT. Thus, it is unlikely that the appearance of AMP bound to the coupling factor after its incubation with ADP is due to the production of free AMP by contaminating adenylate kinase. These results demonstrate that the isolated, homogeneous coupling factor from spinach chloroplasts has the intrinsic capacity to perform a phosphoryl group transfer between two bound ADP molecules and thus to synthesize ATP. This reaction may have an important role in the photosynthetic production of ATP by the chloroplast, as is discussed in this communication. | [
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|
PMID:12179 | Purification and properties of squid mantle adenylate kinase. Role of NADH in control of the enzyme. | Adenylate kinase (ATP:AMP phosphotransferase, EC 2.7.4.3) from the mantle muscle of the squid, Loligo pealeii, was purified over 170-fold to homogeneity as judged by polyacrylamide and starch gel electrophoresis. The tissue contains a single isozyme of adenylate kinase, the enzyme from cytoplasmic and mitochondrial compartments (90 and 10% of total activity, respectively) being identical in physical and kinetic properties. Molecular weight was found to be 27,000 +/- 400. The enzyme shows a pH optimum of 8.2 in the forward (APD utilizing) and 7.4 in the reverse direction. Michaelis constants for ADP, ATP, and AMP are 0.70, 0.13, and 0.15 mM, respectively, with optimal Mg2+:adenylate ratios being 1:2 for ADP and 1:1 for ATP. A comparison of mass action ratios with the equilibrium constant indicated that squid adenylate kinase is held out of equilibrium in resting, but not active, muscle. A search for metabolic modulators of adenylate kinase revealed that NADH (Ki of 0.1 mM) was the only modulator which exerted a significant effect within its in vivo concentration range. The data presented indicate that NADH inhibition is the factor maintaining adenylate kinase in a nonequilibrium state in resting muscle and that release of this inhibition can serve to integrate adenylate kinase into the known scheme of intermediary metabolism in this tissue. A sharp drop in NADH levels at the onset on muscular work co-ordinates that activation of aerobic metabolism in this tissue and allows adenylate kinase to return to equilibrium function. At equilibrium, the enzyme can function to ampligy the concentration of AMP, a potent activator and deinhibitor of key glycolytic and Krebs cycle enzymes. The effect of modulators of adenylate kinase in preventing denaturation by heat or proteolysis revealed that NADH and substrates induced conformational changes in the enzyme which rendered it less susceptible to denaturation. The conformation state induced by NADH differed from that induced by substrate. | Purification and properties of squid mantle adenylate kinase. Role of NADH in control of the enzyme. Adenylate kinase (ATP:AMP phosphotransferase, EC 2.7.4.3) from the mantle muscle of the squid, Loligo pealeii, was purified over 170-fold to homogeneity as judged by polyacrylamide and starch gel electrophoresis. The tissue contains a single isozyme of adenylate kinase, the enzyme from cytoplasmic and mitochondrial compartments (90 and 10% of total activity, respectively) being identical in physical and kinetic properties. Molecular weight was found to be 27,000 +/- 400. The enzyme shows a pH optimum of 8.2 in the forward (APD utilizing) and 7.4 in the reverse direction. Michaelis constants for ADP, ATP, and AMP are 0.70, 0.13, and 0.15 mM, respectively, with optimal Mg2+:adenylate ratios being 1:2 for ADP and 1:1 for ATP. A comparison of mass action ratios with the equilibrium constant indicated that squid adenylate kinase is held out of equilibrium in resting, but not active, muscle. A search for metabolic modulators of adenylate kinase revealed that NADH (Ki of 0.1 mM) was the only modulator which exerted a significant effect within its in vivo concentration range. The data presented indicate that NADH inhibition is the factor maintaining adenylate kinase in a nonequilibrium state in resting muscle and that release of this inhibition can serve to integrate adenylate kinase into the known scheme of intermediary metabolism in this tissue. A sharp drop in NADH levels at the onset on muscular work co-ordinates that activation of aerobic metabolism in this tissue and allows adenylate kinase to return to equilibrium function. At equilibrium, the enzyme can function to ampligy the concentration of AMP, a potent activator and deinhibitor of key glycolytic and Krebs cycle enzymes. The effect of modulators of adenylate kinase in preventing denaturation by heat or proteolysis revealed that NADH and substrates induced conformational changes in the enzyme which rendered it less susceptible to denaturation. The conformation state induced by NADH differed from that induced by substrate. | [
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|
PMID:12180 | Latency of inosine-5'-diphosphatase in microsomes isolated from rat liver. | The latency of inosine-5'-diphosphatase has been studied in microsomes isolated from rat liver. The appearance of latent activity was the result of an increase in the Vmax of the enzyme. This was observed when assays were carried out in the presence of sodium deoxycholate, after microsomes were treated wtih phospholipase C, or at pH 10.3 and after microsomes were subjected to nitrogen cavitation. The apparent Km of inosine-5'-diphosphatase for IDP was unchanged when microsomes were treated with phospholipase C or at pH 10.3 after both these treatments approximately 85% of the enzyme remained bound to the membrane. In contrast, when microsomes were treated with phospholipase C or at pH 10.3 after both these treatments approximately 85% of the enzyme remained bound to the membrane. In contrast, when microsomes were treated with sodium deoxycholate or subjected to nitrogen cavitation, approximately 75% of the inosine-5'-diphosphatase activity was released from the membrane, and the apparent Km of the enzyme for IDP increased 4- and 2-fold, respectively. Microsomal cisternae were loaded with lead phosphate by incubation with glucose-6-P and Pb2+, and the release of this lead phosphate following the addition of EDTA to the medium was determined to estimate the permeability of the microsomal membrane. When microsomes were treated with sodium deoxycholate, phospholipase C, or at alkaline pH, the microsomal membrane became almost completely permeable to EDTA under conditions where there was little or no increase in the activity of inosine-5'-diphosphatase. Microsomes were treated at pH 10.3 and then adjusted slowly to pH 7.5. The activity of inosine-5'-diphosphatase decreased to the same activity observed in untreated preparations. The results seem of exclude the possibility that latent inosine-5'-diphosphatase activity is the result of an increased permeability of the membrane to IDP. They are, however, consistent with the presence of a noncompetitive inhibitor of the enzyme in the microsomal membrane. | Latency of inosine-5'-diphosphatase in microsomes isolated from rat liver. The latency of inosine-5'-diphosphatase has been studied in microsomes isolated from rat liver. The appearance of latent activity was the result of an increase in the Vmax of the enzyme. This was observed when assays were carried out in the presence of sodium deoxycholate, after microsomes were treated wtih phospholipase C, or at pH 10.3 and after microsomes were subjected to nitrogen cavitation. The apparent Km of inosine-5'-diphosphatase for IDP was unchanged when microsomes were treated with phospholipase C or at pH 10.3 after both these treatments approximately 85% of the enzyme remained bound to the membrane. In contrast, when microsomes were treated with phospholipase C or at pH 10.3 after both these treatments approximately 85% of the enzyme remained bound to the membrane. In contrast, when microsomes were treated with sodium deoxycholate or subjected to nitrogen cavitation, approximately 75% of the inosine-5'-diphosphatase activity was released from the membrane, and the apparent Km of the enzyme for IDP increased 4- and 2-fold, respectively. Microsomal cisternae were loaded with lead phosphate by incubation with glucose-6-P and Pb2+, and the release of this lead phosphate following the addition of EDTA to the medium was determined to estimate the permeability of the microsomal membrane. When microsomes were treated with sodium deoxycholate, phospholipase C, or at alkaline pH, the microsomal membrane became almost completely permeable to EDTA under conditions where there was little or no increase in the activity of inosine-5'-diphosphatase. Microsomes were treated at pH 10.3 and then adjusted slowly to pH 7.5. The activity of inosine-5'-diphosphatase decreased to the same activity observed in untreated preparations. The results seem of exclude the possibility that latent inosine-5'-diphosphatase activity is the result of an increased permeability of the membrane to IDP. They are, however, consistent with the presence of a noncompetitive inhibitor of the enzyme in the microsomal membrane. | [
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|
PMID:12181 | Aggregation of deoxyhemoglobin subunits. | The formation of deoxyhemoglobin was examined by measuring the heme spectral change that accompanies the aggregation of isolated alpha and beta chains. At low hemeconcentrations (less than 10(-5) M), tetramer formation can be described by two consecutive, second order reactions representing the aggregation of monomers followed by the association of alphabeta dimers. At neutral pH, the rates of monomer and dimer aggregation are roughly the same, approximately 5 X 10(5) M(-1) X(-1) at 20 degrees. Raising or lowering the pH results in a uniform decrease of both aggregation rates due presumably to repulsion of positively charged subunits at acid pH and repulsion of negatively charged subunits at alkaline pH. Addition of p-hydroxymercuribenzoate to alpha chains lowers the rate of monomer aggregation whereas addition of mercurials to the beta subunits appears to lower both the rate of monomer and the rate of dimer aggregation. At high heme concentrations (greater than 10(-5) M) or in the presence of organic phosphates, the rate of chain aggregation becomes limited, in part, by the slow dissociation of beta chain tetramers. In the case of inositol hexaphosphate, the rate of hemoglobin formation exhibits a bell-shaped dependence on phosphate concentration. When intermediate concentrations of inositol hexaphosphate (approximately 10(-4 M) are preincubated with beta subunits, a slow first order time course is observed and exhibits a half-time of about 8 min. As more inositol hexaphosphate is added, the chain aggregation reaction begins to occur more rapidly. Eventually at about 10(-2) M inositol hexaphospate, the time course becomes almost identical to that observed in the absence of phosphates. The increase in the velocity of the chain aggregation reaction at high phosphate concentrations suggests strongly that inositol hexaphosphate binds to beta monomers and, if added in sufficiently large amounts, promotes beta4 dissociation. A quantitative analysis of these results showed that the affinity of beta monomers for inositol hexaphosphate is the same as that of alphabeta dimers. Only when tetramers are formed, either alpha2beta2 or beta4, is a marked increase in affinity for inositol hexaphosphate observed. | Aggregation of deoxyhemoglobin subunits. The formation of deoxyhemoglobin was examined by measuring the heme spectral change that accompanies the aggregation of isolated alpha and beta chains. At low hemeconcentrations (less than 10(-5) M), tetramer formation can be described by two consecutive, second order reactions representing the aggregation of monomers followed by the association of alphabeta dimers. At neutral pH, the rates of monomer and dimer aggregation are roughly the same, approximately 5 X 10(5) M(-1) X(-1) at 20 degrees. Raising or lowering the pH results in a uniform decrease of both aggregation rates due presumably to repulsion of positively charged subunits at acid pH and repulsion of negatively charged subunits at alkaline pH. Addition of p-hydroxymercuribenzoate to alpha chains lowers the rate of monomer aggregation whereas addition of mercurials to the beta subunits appears to lower both the rate of monomer and the rate of dimer aggregation. At high heme concentrations (greater than 10(-5) M) or in the presence of organic phosphates, the rate of chain aggregation becomes limited, in part, by the slow dissociation of beta chain tetramers. In the case of inositol hexaphosphate, the rate of hemoglobin formation exhibits a bell-shaped dependence on phosphate concentration. When intermediate concentrations of inositol hexaphosphate (approximately 10(-4 M) are preincubated with beta subunits, a slow first order time course is observed and exhibits a half-time of about 8 min. As more inositol hexaphosphate is added, the chain aggregation reaction begins to occur more rapidly. Eventually at about 10(-2) M inositol hexaphospate, the time course becomes almost identical to that observed in the absence of phosphates. The increase in the velocity of the chain aggregation reaction at high phosphate concentrations suggests strongly that inositol hexaphosphate binds to beta monomers and, if added in sufficiently large amounts, promotes beta4 dissociation. A quantitative analysis of these results showed that the affinity of beta monomers for inositol hexaphosphate is the same as that of alphabeta dimers. Only when tetramers are formed, either alpha2beta2 or beta4, is a marked increase in affinity for inositol hexaphosphate observed. | [
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|
PMID:12182 | Comparison of the size and physical properties of gamma-glutamyltranspeptidase purified from rat kidney following solubilization with papain or with Triton X-100. | gamma-Glutamyltranspeptidase is associated with the brush border membrane of kidney proximal straight tubule cells. It can be solubilized qualitatively by treatment with papain or Triton X-100. Neither procedure affects its catalytic activity but the two resulting forms of the enzyme differ considerably in their physical properties. The papain-solubilized transpeptidase is soluble in aqueous buffers and was purified 430-fold. It has an s20,w of 4.9 S, a Stokes radius of 36 A, and a calculated molecular weight of 69,000. It appears homogeneous by sedimentation equilibrium centrifugation (Mr=66,700). In contrast, the Triton-solubilized transpeptidase is soluble only in the presence of detergents and was purifed 300-fold. This form of the enzyme has a Stokes radius of 70 A but an s20,w of only 4.15 S. Aggregation of the enzyme just below the critical micelle concentration of Triton X-100 and its ability to bind 1.16 mg of Triton X-100-protein complex was calculated to be 169,000, but the glycoprotein portion of the complex is 52% of the total mass (87,000). The mass of Triton X-100 (82,000) is consistent with its reported micelle molecular weight. Treatment of the Triton-purified transpeptidase with papain or bromelain results in a form of the enzyme identical in all respects with the papain-purified enzyme. Both the Triton- and papain-purified transpeptidase exhibit two protein bands on sodium lauryl sulfate-polyacrylamide gel electrophoresis. The smaller subunits of the two forms appear identical (Mr=27,000), while the larger subunits of the Triton- and papain-purified enzyme have apparent molecular weights of 54,000 and 51,000, respectively. These data suggest that a peptide (3,000 to 19,000) in the larger subunit of gamma-glutamyltranspeptidase is responsible for its binding to Triton micelles and probably for holding the enzyme in the brush border membrane. | Comparison of the size and physical properties of gamma-glutamyltranspeptidase purified from rat kidney following solubilization with papain or with Triton X-100. gamma-Glutamyltranspeptidase is associated with the brush border membrane of kidney proximal straight tubule cells. It can be solubilized qualitatively by treatment with papain or Triton X-100. Neither procedure affects its catalytic activity but the two resulting forms of the enzyme differ considerably in their physical properties. The papain-solubilized transpeptidase is soluble in aqueous buffers and was purified 430-fold. It has an s20,w of 4.9 S, a Stokes radius of 36 A, and a calculated molecular weight of 69,000. It appears homogeneous by sedimentation equilibrium centrifugation (Mr=66,700). In contrast, the Triton-solubilized transpeptidase is soluble only in the presence of detergents and was purifed 300-fold. This form of the enzyme has a Stokes radius of 70 A but an s20,w of only 4.15 S. Aggregation of the enzyme just below the critical micelle concentration of Triton X-100 and its ability to bind 1.16 mg of Triton X-100-protein complex was calculated to be 169,000, but the glycoprotein portion of the complex is 52% of the total mass (87,000). The mass of Triton X-100 (82,000) is consistent with its reported micelle molecular weight. Treatment of the Triton-purified transpeptidase with papain or bromelain results in a form of the enzyme identical in all respects with the papain-purified enzyme. Both the Triton- and papain-purified transpeptidase exhibit two protein bands on sodium lauryl sulfate-polyacrylamide gel electrophoresis. The smaller subunits of the two forms appear identical (Mr=27,000), while the larger subunits of the Triton- and papain-purified enzyme have apparent molecular weights of 54,000 and 51,000, respectively. These data suggest that a peptide (3,000 to 19,000) in the larger subunit of gamma-glutamyltranspeptidase is responsible for its binding to Triton micelles and probably for holding the enzyme in the brush border membrane. | [
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PMID:12183 | Plasma protein synthesis by isolated rat hepatocytes. | A system of preparation of rat hepatocytes with extended viability has been developed to study the role of hormones and other plasma components upon secretory protein synthesis. Hepatocytes maintained in minimal essential medium reduced the levels of all amino acids in the medium except the slowly catabolized amino acids leucine, isoleucine, and valine, which steadily increase as the result of catabolism of liver protein. Although the liver cells catabolize 10-15% of their own protein during a 20-h incubation, the cells continue to secrete protein in a linear fashion throughout the period. The effects of insulin, cortisol, and epinephrine on general protein synthesis, and specifically on fibrinogen and albumin synthesis, have been tested on cells from both normal rats and adrenalectomized rats. Cells from normal animals show preinduction of tyrosine amino transferase (TAT), having at the time of isolation a high level of enzyme which shows only an increase of approximately 60% upon incubation with cortisol. In contrast, cells from adrenalectomized animals initially have a low level of enzyme which increases fourfold over a period of 9 h. The effects of both epinephrine and cortisol on protein synthesis are also much larger in cells from adrenalectomized animals. After a delay of several hours, cortisol increases fibrinogen synthesis sharply, so that at the end of the 20-h incubation, cells treated with hormone have secreted nearly 2.5 times as much fibrinogen as control cells. The effect is specific; cortisol stimulates neither albumin secretion nor intracellular protein synthesis. The combination of cortisol and epinephrine strongly depresses albumin synthesis in both types of cells. Insulin enhances albumin and general protein synthesis but has little effect on fibrinogen synthesis. | Plasma protein synthesis by isolated rat hepatocytes. A system of preparation of rat hepatocytes with extended viability has been developed to study the role of hormones and other plasma components upon secretory protein synthesis. Hepatocytes maintained in minimal essential medium reduced the levels of all amino acids in the medium except the slowly catabolized amino acids leucine, isoleucine, and valine, which steadily increase as the result of catabolism of liver protein. Although the liver cells catabolize 10-15% of their own protein during a 20-h incubation, the cells continue to secrete protein in a linear fashion throughout the period. The effects of insulin, cortisol, and epinephrine on general protein synthesis, and specifically on fibrinogen and albumin synthesis, have been tested on cells from both normal rats and adrenalectomized rats. Cells from normal animals show preinduction of tyrosine amino transferase (TAT), having at the time of isolation a high level of enzyme which shows only an increase of approximately 60% upon incubation with cortisol. In contrast, cells from adrenalectomized animals initially have a low level of enzyme which increases fourfold over a period of 9 h. The effects of both epinephrine and cortisol on protein synthesis are also much larger in cells from adrenalectomized animals. After a delay of several hours, cortisol increases fibrinogen synthesis sharply, so that at the end of the 20-h incubation, cells treated with hormone have secreted nearly 2.5 times as much fibrinogen as control cells. The effect is specific; cortisol stimulates neither albumin secretion nor intracellular protein synthesis. The combination of cortisol and epinephrine strongly depresses albumin synthesis in both types of cells. Insulin enhances albumin and general protein synthesis but has little effect on fibrinogen synthesis. | [
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|
PMID:12184 | Differential binding of methyl benzimidazol-2-yl carbamate to fungal tubulin as a mechanism of resistance to this antimitotic agent in mutant strains of Aspergillus nidulans. | The antimitotic compound methyl benzimidazol-2-yl carbamate (MBC) formed a complex in vitro with a protein present in mycelial extracts of fungi. The binding protein of Aspergillus nidulans showed a set of properties which is unique for tubulin. Binding occurred rapidly at 4 degrees C and was competitively inhibited by oncodazole and colchicine. Other inhibitors of microtubule function such as podophyllotoxin, vinblastine sulfate, melatonin, and griseofulvin did not interfere with binding of MBC. Electrophoretic analysis of partially purified preparations of the binding protein revealed the presence of proteins with similar mobilities as mammalian tubulin monomers. Hence it is concluded that the binding protein is identical with fungal tubulin. The effect of MBC on mycelial growth of mutant strains of A. nidulans was positively correlated with the affinity of the binding sites for this compound. The apparent binding constant for MBC and tubulin from a wild type was estimated at 4.5 X 10(5), from a resistant strain at 3.7 X 10(4), and from a strain with increased sensitivity to MBC at 1.6 X 10(6) liters/mol. Mutants showing resistance and increased sensitivity to MBC are candidates to have alterations in tubulin structure. Affinity of tubulin for MBC is probably a common mechanism of resistance to this compound in fungi. Low affinity of tubulin for MBC is probably a common mechanism of resistance binding constant of 2.5 X 10(3) liters/mol. | Differential binding of methyl benzimidazol-2-yl carbamate to fungal tubulin as a mechanism of resistance to this antimitotic agent in mutant strains of Aspergillus nidulans. The antimitotic compound methyl benzimidazol-2-yl carbamate (MBC) formed a complex in vitro with a protein present in mycelial extracts of fungi. The binding protein of Aspergillus nidulans showed a set of properties which is unique for tubulin. Binding occurred rapidly at 4 degrees C and was competitively inhibited by oncodazole and colchicine. Other inhibitors of microtubule function such as podophyllotoxin, vinblastine sulfate, melatonin, and griseofulvin did not interfere with binding of MBC. Electrophoretic analysis of partially purified preparations of the binding protein revealed the presence of proteins with similar mobilities as mammalian tubulin monomers. Hence it is concluded that the binding protein is identical with fungal tubulin. The effect of MBC on mycelial growth of mutant strains of A. nidulans was positively correlated with the affinity of the binding sites for this compound. The apparent binding constant for MBC and tubulin from a wild type was estimated at 4.5 X 10(5), from a resistant strain at 3.7 X 10(4), and from a strain with increased sensitivity to MBC at 1.6 X 10(6) liters/mol. Mutants showing resistance and increased sensitivity to MBC are candidates to have alterations in tubulin structure. Affinity of tubulin for MBC is probably a common mechanism of resistance to this compound in fungi. Low affinity of tubulin for MBC is probably a common mechanism of resistance binding constant of 2.5 X 10(3) liters/mol. | [
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|
PMID:12186 | [Ultra-selective vagotomy in the treatment of duodenal ulcer. Report on the round table discussion (77th French Surgery Congress, 1975)]. | This panel enables us to draw following conclusions on highly selective vagotomy for duodenal ulcer: --One fact seems to be sure: H.S.V. is a benign and efficient operation over short and average periods of time, providing that some technical requirements are observed. --However some points are still under discussion and much debated: --the useful purpose of per-operative tests; --the more or less frequent addition of drainage procedure. --Lastly, long-term anti-ulcerous efficiency (over 5 years) is still not known precisely; some think that the risk of vagal regeneration are greater after this type of vagotomy. | [Ultra-selective vagotomy in the treatment of duodenal ulcer. Report on the round table discussion (77th French Surgery Congress, 1975)]. This panel enables us to draw following conclusions on highly selective vagotomy for duodenal ulcer: --One fact seems to be sure: H.S.V. is a benign and efficient operation over short and average periods of time, providing that some technical requirements are observed. --However some points are still under discussion and much debated: --the useful purpose of per-operative tests; --the more or less frequent addition of drainage procedure. --Lastly, long-term anti-ulcerous efficiency (over 5 years) is still not known precisely; some think that the risk of vagal regeneration are greater after this type of vagotomy. | [
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|
PMID:12187 | Chromatographic characterization of phenothiazine drugs by a reversed-phase thin-layer technique. | A reversed-phase thin-layer chromatographic technique was used for the characterization of 26 phenothiazine drugs. With two chromatographic systems having the sam stationary phase and phase volume ratio, but mobile phases of different pH, all but two of the compounds could be identified. Rf values in the different systems were standardized by applying a reference compound to the plates next to each compound under investigation; the corrected Rf values were calculated from the differences in the Rm values of the compounds and the reference compound, and the theoretical Rm value of the reference. It was shown that Rf values for different chromatographic systems with the same stationary phase could be predicted with reasonable accuracy. The pH of the mobile phase, for which a maximum difference in Rf values was obtained for pairs of compounds, could also be calculated and corresponded well with the observed values. | Chromatographic characterization of phenothiazine drugs by a reversed-phase thin-layer technique. A reversed-phase thin-layer chromatographic technique was used for the characterization of 26 phenothiazine drugs. With two chromatographic systems having the sam stationary phase and phase volume ratio, but mobile phases of different pH, all but two of the compounds could be identified. Rf values in the different systems were standardized by applying a reference compound to the plates next to each compound under investigation; the corrected Rf values were calculated from the differences in the Rm values of the compounds and the reference compound, and the theoretical Rm value of the reference. It was shown that Rf values for different chromatographic systems with the same stationary phase could be predicted with reasonable accuracy. The pH of the mobile phase, for which a maximum difference in Rf values was obtained for pairs of compounds, could also be calculated and corresponded well with the observed values. | [
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|
PMID:12188 | Use of acetonitrile for the extraction of herbicide residues from soils. | Using a 10% aqueous acetonitrile solution for extraction and an identical solvent clean-up procedure, soil-based residues of the herbicides alachlor, benzoyl-prop-ethyl, flufenprop-isopropyl, flufenprop-methyl, dichlorfop-methyl, nitrofen, and profluralin were recovered reproducibly from three prairie soils fortified at 0.5 and 0.1 ppm levels. The acidic herbicides benazolin, 2,4-D, and 2,4,5-T, together with the acids derived from benzoylprop-ethyl, dichlorfop-methyl, flufenprop-isopropyl, and flufenprop-methyl were reproducibly recovered from the three prairie soils fortified at 0.5 and 0.1 ppm levels using 30% aqueous acetonitrile containing 1% acetic acid after identical clean-up stages. All compounds were analysed by gas chromatographic means utilising an electron-capture detector. The two procedures described were developed for the routine extraction and analysis of neutral and acidic herbicide residues from field soil persistence studies. | Use of acetonitrile for the extraction of herbicide residues from soils. Using a 10% aqueous acetonitrile solution for extraction and an identical solvent clean-up procedure, soil-based residues of the herbicides alachlor, benzoyl-prop-ethyl, flufenprop-isopropyl, flufenprop-methyl, dichlorfop-methyl, nitrofen, and profluralin were recovered reproducibly from three prairie soils fortified at 0.5 and 0.1 ppm levels. The acidic herbicides benazolin, 2,4-D, and 2,4,5-T, together with the acids derived from benzoylprop-ethyl, dichlorfop-methyl, flufenprop-isopropyl, and flufenprop-methyl were reproducibly recovered from the three prairie soils fortified at 0.5 and 0.1 ppm levels using 30% aqueous acetonitrile containing 1% acetic acid after identical clean-up stages. All compounds were analysed by gas chromatographic means utilising an electron-capture detector. The two procedures described were developed for the routine extraction and analysis of neutral and acidic herbicide residues from field soil persistence studies. | [
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|
PMID:12189 | High-pressure liquid chromatography of cannabis. Quantitative analysis of acidic and neutral cannabinoids. | A reversed-phase high-pressure liquid chromatographic method has been developed for the simultaneous analysis of the acidic and neutral cannabinoids in cannabis. Cannabigerol and cannabigerolic acid have been located in the liquid chromatogram of cannabis and factors affecting the chromatographic process are discussed. A method for quantitating one component in the presence of a second unresolved component is described. | High-pressure liquid chromatography of cannabis. Quantitative analysis of acidic and neutral cannabinoids. A reversed-phase high-pressure liquid chromatographic method has been developed for the simultaneous analysis of the acidic and neutral cannabinoids in cannabis. Cannabigerol and cannabigerolic acid have been located in the liquid chromatogram of cannabis and factors affecting the chromatographic process are discussed. A method for quantitating one component in the presence of a second unresolved component is described. | [
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|
PMID:12190 | Residual anionic properties of a covalently substituted controlled-pore glass, glyceryl-CPG. | A commercial controlled-pore glass medium for exclusion chromatography which is substituted with glycerol to eliminate non-specific adsorption (Glyceryl-CPG) was examined. Experiments on the elution of acetylcholinesterase and ganglioside micelles at varied ionic strength and pH showed that a slight anionic character still persisted on the glass matrix. At ionic strengths above 0.1, this had no effect on the elution of proteins. The material was found to have no tendency to adsorb proteins and other compounds, and was judged an excellent medium for exclusion chromatography. As a support for affinity chromatography, Glyceryl-CPG could be activated by periodate to form a virtually neutral matrix-ligand system. | Residual anionic properties of a covalently substituted controlled-pore glass, glyceryl-CPG. A commercial controlled-pore glass medium for exclusion chromatography which is substituted with glycerol to eliminate non-specific adsorption (Glyceryl-CPG) was examined. Experiments on the elution of acetylcholinesterase and ganglioside micelles at varied ionic strength and pH showed that a slight anionic character still persisted on the glass matrix. At ionic strengths above 0.1, this had no effect on the elution of proteins. The material was found to have no tendency to adsorb proteins and other compounds, and was judged an excellent medium for exclusion chromatography. As a support for affinity chromatography, Glyceryl-CPG could be activated by periodate to form a virtually neutral matrix-ligand system. | [
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|
PMID:12191 | Inhibition of human plasma renin activity by pepstatin. | Pepstatin, a pentapeptide isolated from streptomyces, is a powerful inhibitor of several acid proteases. Its ability to inhibit the renin-angiotensinogen reaction was studied in vitro, in various human plasma. A 50% inhibition of plasma renin activity was obtained with 10(-6)M pepstatin at pH 5.7 and 10(-5)M at pH 7.4. The inhibition of plasma renin activity by pepstatin was studied in hypertensive patients with various plasma renin levels. The inhibitory effect could be demonstrated in patients with low, normal and high renin activity at both pH's. The type of inhibition and the inhibitory constant were investigated by Dixon plot and Lineweaver-Burk plot in three separate experiments. On both representations, a competitive type of inhibition was found with an inhibitory constant of about 1.2 x 10(-6)M. | Inhibition of human plasma renin activity by pepstatin. Pepstatin, a pentapeptide isolated from streptomyces, is a powerful inhibitor of several acid proteases. Its ability to inhibit the renin-angiotensinogen reaction was studied in vitro, in various human plasma. A 50% inhibition of plasma renin activity was obtained with 10(-6)M pepstatin at pH 5.7 and 10(-5)M at pH 7.4. The inhibition of plasma renin activity by pepstatin was studied in hypertensive patients with various plasma renin levels. The inhibitory effect could be demonstrated in patients with low, normal and high renin activity at both pH's. The type of inhibition and the inhibitory constant were investigated by Dixon plot and Lineweaver-Burk plot in three separate experiments. On both representations, a competitive type of inhibition was found with an inhibitory constant of about 1.2 x 10(-6)M. | [
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|
PMID:12192 | Adaptive responses of brain cyclic AMP-generating systems to alterations in synaptic input. | The concept of subsensitivity and supersensitivity as a mechanism of neuronal adaptation to alterations in synaptic activity in the brain is an attractive one. However, the complexity of the central nervous system has made it difficult to determine the cellular basis of apparent changes in neuronal excitability resulting from alterations in synaptic input (cf. ref. 83). It now seems that, at least for inhibitory central pathways in which cyclic AMP-generating systems mediate postsynaptic receptor-responses, alterations in synaptic input lead in rat cortex to predictable super- or subsensitivity of the norepinephrine-sensitive cyclic AMP-systems. Supersensitivity of histamine-sensitive cyclic AMP-systems also occurs in rat cortex as a result of apparent lesions of histaminergic tracts. The reason that supersensitivity does not develop to norepinephrine and histamine in guinea pig cortex after similar "denervations" is not known, but is central to an understanding of the factors involved in the role of cyclic AMP-mechanisms to the adaptive plasticity of the central nervous system. However, even before an understanding of all the factors involved in alterations in cyclic AMP-responses in brain tissue is obtained, studies on the effects of environmental and drug-manipulations can provide insights both into the central roles for cyclic AMP-mechanisms and into the nature of drug action. Clearly, an understanding of the interelationships of synaptic input and adaptive changes in postsynaptic cyclic AMP-systems and the exploitation of such knowledge for the elucidation of central adaptive function is an exciting challenge for future research. | Adaptive responses of brain cyclic AMP-generating systems to alterations in synaptic input. The concept of subsensitivity and supersensitivity as a mechanism of neuronal adaptation to alterations in synaptic activity in the brain is an attractive one. However, the complexity of the central nervous system has made it difficult to determine the cellular basis of apparent changes in neuronal excitability resulting from alterations in synaptic input (cf. ref. 83). It now seems that, at least for inhibitory central pathways in which cyclic AMP-generating systems mediate postsynaptic receptor-responses, alterations in synaptic input lead in rat cortex to predictable super- or subsensitivity of the norepinephrine-sensitive cyclic AMP-systems. Supersensitivity of histamine-sensitive cyclic AMP-systems also occurs in rat cortex as a result of apparent lesions of histaminergic tracts. The reason that supersensitivity does not develop to norepinephrine and histamine in guinea pig cortex after similar "denervations" is not known, but is central to an understanding of the factors involved in the role of cyclic AMP-mechanisms to the adaptive plasticity of the central nervous system. However, even before an understanding of all the factors involved in alterations in cyclic AMP-responses in brain tissue is obtained, studies on the effects of environmental and drug-manipulations can provide insights both into the central roles for cyclic AMP-mechanisms and into the nature of drug action. Clearly, an understanding of the interelationships of synaptic input and adaptive changes in postsynaptic cyclic AMP-systems and the exploitation of such knowledge for the elucidation of central adaptive function is an exciting challenge for future research. | [
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PMID:12194 | Enhancement of methacholine-stimulated guanosine 3':5'-cyclic monophosphate formation in supersensitive guinea pig vasa deferentia. | Decentralization of the guinea pig vas deferens resulted in supersensitivity of the contractile response to methacholine. Methacholine also elevated cyclic GMP to a greater extent in the decentralized vas deferens than in sham-operated controls. Decentralization did not alter basal cyclic AMP or cyclic GMP content. These observations are analogous to the enhanced responsiveness of cyclic AMP formation in supersensitive beta adrenergic systems. | Enhancement of methacholine-stimulated guanosine 3':5'-cyclic monophosphate formation in supersensitive guinea pig vasa deferentia. Decentralization of the guinea pig vas deferens resulted in supersensitivity of the contractile response to methacholine. Methacholine also elevated cyclic GMP to a greater extent in the decentralized vas deferens than in sham-operated controls. Decentralization did not alter basal cyclic AMP or cyclic GMP content. These observations are analogous to the enhanced responsiveness of cyclic AMP formation in supersensitive beta adrenergic systems. | [
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|
PMID:12193 | Inhibition of mammalian soluble guanylate cyclase activity by adenosine 5'-tetraphosphate, guanosine 5'-tetraphosphate and other nucleotides. | The effects of a variety of purine and pyrimidine nucleotides were tested for their capacity to inhibit mammalian soluble guanylate cyclase activity. Adenosine 5'-tetraphosphate (ATetP), ATP, ADP, AMP, guanosine 5'-tetraphosphate (GTetP) and GDP were found to inhibit soluble guanylate cyclase activity from rat lung and other mammalian tissues. The corresponding cytosine and thymine nucleotides showed little or no inhibitory activity, except for thymidine 5'-tetraphosphate, which inhibited glanylate cyclase activity but to a lesser extent than did the purine nucleoside tetraphosphates. ATetP and GTetP were found to be potent inhibitors of soluble guanylate cyclase activity from rat, guinea pig and mouse lung, rat heart and rat brain. Both purine nucleoside tetraphosphates were competitive inhibitors of the rat lung soluble enzyme. ATetP and GTetP had Ki values of 1 muM and 2.5 muM, respectively. The experimental data suggest that purine nucleoside tetraphosphates, and perhaps other purine nucleotides, may play a biologic role in modulating mammalian soluble guanylate cyclase activity. | Inhibition of mammalian soluble guanylate cyclase activity by adenosine 5'-tetraphosphate, guanosine 5'-tetraphosphate and other nucleotides. The effects of a variety of purine and pyrimidine nucleotides were tested for their capacity to inhibit mammalian soluble guanylate cyclase activity. Adenosine 5'-tetraphosphate (ATetP), ATP, ADP, AMP, guanosine 5'-tetraphosphate (GTetP) and GDP were found to inhibit soluble guanylate cyclase activity from rat lung and other mammalian tissues. The corresponding cytosine and thymine nucleotides showed little or no inhibitory activity, except for thymidine 5'-tetraphosphate, which inhibited glanylate cyclase activity but to a lesser extent than did the purine nucleoside tetraphosphates. ATetP and GTetP were found to be potent inhibitors of soluble guanylate cyclase activity from rat, guinea pig and mouse lung, rat heart and rat brain. Both purine nucleoside tetraphosphates were competitive inhibitors of the rat lung soluble enzyme. ATetP and GTetP had Ki values of 1 muM and 2.5 muM, respectively. The experimental data suggest that purine nucleoside tetraphosphates, and perhaps other purine nucleotides, may play a biologic role in modulating mammalian soluble guanylate cyclase activity. | [
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|
PMID:12195 | Enhancement of the antiplaque value of antibacterial agents through enamel-conditioning methods: II. Acquisition of antiplaque properties by treated enamel. | Enamel specimens treated with systems containing enamel conditioners and antibacterial agents have previously been shown to incorporate the latter into the enamel. It has now been demonstrated that enamel blocks treated with these systems become highly resistant to bacterial colonization, that this effect is rather long lasting, and that the treated specimens prevent acid formation when incubated with Streptococcus mutans in a sugar-containing medium. | Enhancement of the antiplaque value of antibacterial agents through enamel-conditioning methods: II. Acquisition of antiplaque properties by treated enamel. Enamel specimens treated with systems containing enamel conditioners and antibacterial agents have previously been shown to incorporate the latter into the enamel. It has now been demonstrated that enamel blocks treated with these systems become highly resistant to bacterial colonization, that this effect is rather long lasting, and that the treated specimens prevent acid formation when incubated with Streptococcus mutans in a sugar-containing medium. | [
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|
PMID:12204 | The systemic use of procaine in the treatment of the elderly: a review. | This article is a review and evaluation of the world literature on the systemic use of procaine in the treatment of the aging process and the common chronic diseases of later life. Included are data from 285 articles and books, describing treatment in more than 100,000 patients in the past 25 years. Except for a possible antidepressant effect, there is no convincing evidence that procaine (or Gerovital, of which procaine is the major component) has any value in the treatment of disease in older patients. If procaine has an antidepressant effect, there is some likelihood that this accounts for the reports of decreased complaints referable to the musculoskeletal, cardiovascular, endocrine sexual, gastrointestinal and respiratory systems. | The systemic use of procaine in the treatment of the elderly: a review. This article is a review and evaluation of the world literature on the systemic use of procaine in the treatment of the aging process and the common chronic diseases of later life. Included are data from 285 articles and books, describing treatment in more than 100,000 patients in the past 25 years. Except for a possible antidepressant effect, there is no convincing evidence that procaine (or Gerovital, of which procaine is the major component) has any value in the treatment of disease in older patients. If procaine has an antidepressant effect, there is some likelihood that this accounts for the reports of decreased complaints referable to the musculoskeletal, cardiovascular, endocrine sexual, gastrointestinal and respiratory systems. | [
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PMID:12205 | [Diagnosis of fetal distress during labor with the aid of the Hammacher cardio-tocographic score and fetal pH determination]. | The authors study the value of the Hammacher tocographic scoring system in the diagnosis of fetal distress in labour. This score gives equal value to three components of the fetal heart rate: the base line, transient variations (dips) and fluctuations (oscillations). There is a statistically very significant (p less than 0.001) relationship between the cardio-tocographic score and the fetal pH as has been found in 106 labours with a coefficient of correlation of 0.67. The score can only be carried out usefully when a "beat to beat" to heart rate is registered and when this is not influenced by the administration of drugs to the mother. The score has been demonstrated to be particularly useful in the diagnosis of fetal distress when the membranes are still intact. | [Diagnosis of fetal distress during labor with the aid of the Hammacher cardio-tocographic score and fetal pH determination]. The authors study the value of the Hammacher tocographic scoring system in the diagnosis of fetal distress in labour. This score gives equal value to three components of the fetal heart rate: the base line, transient variations (dips) and fluctuations (oscillations). There is a statistically very significant (p less than 0.001) relationship between the cardio-tocographic score and the fetal pH as has been found in 106 labours with a coefficient of correlation of 0.67. The score can only be carried out usefully when a "beat to beat" to heart rate is registered and when this is not influenced by the administration of drugs to the mother. The score has been demonstrated to be particularly useful in the diagnosis of fetal distress when the membranes are still intact. | [
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|
PMID:12206 | [The risk of cardiac arrest during laparoscopy. A study of 50,000 laparoscopies and animal experimentation]. | In a French national enquiry into 50,000 laparoscopies it emerges that the number of cardiac arrests works out at 1 in 2,000. The percentage of reversible cardiac arrests was 1 in 2500 and of irreversible cardiac arrests 1.2 in 10,000. 25 cases were studied in great detail, both clinically and physiopathologically. This was thanks to a very full questionnaire most kindly filled up by those who had told us that this type of accident had happened in their practice. The physiopathogenesis of circulatory arrests during laparoscopy is complex. It appears however that among the different potentiating factors are changes in haemodynamics and biological changes that give rise to the greatest risks. Experimental work carried out with a long-tailed baboon was performed by the authors with the idea on the one hand of confirming that haemodynamic and biological troubles resulting from the pneumoperitoneum were important and on the other hand of analysing the changes in detail and of working out prophylactic principles for the anaesthetist and the laparoscopist. | [The risk of cardiac arrest during laparoscopy. A study of 50,000 laparoscopies and animal experimentation]. In a French national enquiry into 50,000 laparoscopies it emerges that the number of cardiac arrests works out at 1 in 2,000. The percentage of reversible cardiac arrests was 1 in 2500 and of irreversible cardiac arrests 1.2 in 10,000. 25 cases were studied in great detail, both clinically and physiopathologically. This was thanks to a very full questionnaire most kindly filled up by those who had told us that this type of accident had happened in their practice. The physiopathogenesis of circulatory arrests during laparoscopy is complex. It appears however that among the different potentiating factors are changes in haemodynamics and biological changes that give rise to the greatest risks. Experimental work carried out with a long-tailed baboon was performed by the authors with the idea on the one hand of confirming that haemodynamic and biological troubles resulting from the pneumoperitoneum were important and on the other hand of analysing the changes in detail and of working out prophylactic principles for the anaesthetist and the laparoscopist. | [
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|
PMID:12234 | Human epidermal transglutaminase. II. Immunologic properties. | A monospecific antibody for human epidermal transglutaminase was prepared in rabbits. The antibody formed single immunoprecipitin lines with purified or crude human transglutaminases and quantitatively precipitated transglutaminase activity. There were no precipitin reactions between human factor XIII (zymogen or active enzyme) and antihuman epidermal transglutaminase or between human epidermal transglutaminase and antihuman factor XIII. Heating epidermal transglutaminase (56 degrees C, 15 min) in the presence of calcium increased the enzyme activity up to 10 times baseline levels. The heat-activated human epidermal transglutaminase was identical by immunodiffusion with the native enzyme, although slightly higher precipitation titers were detected following heating. There was no cross-reaction of antihuman epidermal transglutaminase with frog, rat, mouse, chicken, or human hair follicle transglutaminases. | Human epidermal transglutaminase. II. Immunologic properties. A monospecific antibody for human epidermal transglutaminase was prepared in rabbits. The antibody formed single immunoprecipitin lines with purified or crude human transglutaminases and quantitatively precipitated transglutaminase activity. There were no precipitin reactions between human factor XIII (zymogen or active enzyme) and antihuman epidermal transglutaminase or between human epidermal transglutaminase and antihuman factor XIII. Heating epidermal transglutaminase (56 degrees C, 15 min) in the presence of calcium increased the enzyme activity up to 10 times baseline levels. The heat-activated human epidermal transglutaminase was identical by immunodiffusion with the native enzyme, although slightly higher precipitation titers were detected following heating. There was no cross-reaction of antihuman epidermal transglutaminase with frog, rat, mouse, chicken, or human hair follicle transglutaminases. | [
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PMID:12235 | Interactions between viruses and bacteria in patients with chronic bronchitis. | The possibility that viral infections of the respiratory tract might predispose to bacterial colonization or infection was studied in 120 patients with chronic obstructive pulmonary disease and 30 control subjects; these individuals were observed for seven years. The ratio of the number of observed to the number of expected associations between viruses and bacteria was 2.43 (P = 0.037) for the pair influenza virus and Streptococcus pneumoniae and was 2.06 (P = 0.056) for influenza virus and Haemophilus influenzae. Consistently positive, but not significant, associations were detected between rhinovirus and herpes simplex virus infections and isolations of S. pneumoniae and H. influenzae. In contrast, isolations of the nonpathogenic Haemophilus parainfluenzae could not be related to prior viral infections. Significant rises in titer of antibody to H. influenzae were detected on 76 occasions, and 20 (26%) of these antibody rises were associated with viral or mycoplasmal infections during the preceding 120 days. The expected number of such associations was 8.34 (ratio of number observed to number expected, 2.40; P = 0.08). These results suggest that viral infections of the respiratory tract in patients with chronic obstructive pulmonary disease are associated with increased colonization by potentially pathogenic bacteria and may also predispose to infections with H. influenzae. | Interactions between viruses and bacteria in patients with chronic bronchitis. The possibility that viral infections of the respiratory tract might predispose to bacterial colonization or infection was studied in 120 patients with chronic obstructive pulmonary disease and 30 control subjects; these individuals were observed for seven years. The ratio of the number of observed to the number of expected associations between viruses and bacteria was 2.43 (P = 0.037) for the pair influenza virus and Streptococcus pneumoniae and was 2.06 (P = 0.056) for influenza virus and Haemophilus influenzae. Consistently positive, but not significant, associations were detected between rhinovirus and herpes simplex virus infections and isolations of S. pneumoniae and H. influenzae. In contrast, isolations of the nonpathogenic Haemophilus parainfluenzae could not be related to prior viral infections. Significant rises in titer of antibody to H. influenzae were detected on 76 occasions, and 20 (26%) of these antibody rises were associated with viral or mycoplasmal infections during the preceding 120 days. The expected number of such associations was 8.34 (ratio of number observed to number expected, 2.40; P = 0.08). These results suggest that viral infections of the respiratory tract in patients with chronic obstructive pulmonary disease are associated with increased colonization by potentially pathogenic bacteria and may also predispose to infections with H. influenzae. | [
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|
PMID:12236 | Experimental otitis media due to Streptococcus pneumoniae: immunopathogenic response in the chinchilla. | Acute otitis media was produced in 110 chinchillas by inoculation of type 23 Streptococcus pneumoniae directly into the middle ear cavity by tympanotomy. During the first three days after inoculation, inflammatory cells were seen in the mucoperiosteum of the middle ear. After four to seven days, there was purulent exudation in the middle ear cavity, and 40% of the animals had pneumococcal meningitis and/or bacteremia. The middle ears were sterile in five of 28 animals sacrificed during the second week and in six of seven animals sacrificed at six weeks, although subepithelial changes persisted in the mucoperiosteum. Levels of antibody to S. pneumoniae in serum were measured by radioimmunoassay; mean values were 6.1 ng of pneumococcal antibody nitrogen/ml in 28 uninfected control animals and 16.5 ng of antibody nitrogen/ml in 29 animals sacrificed two weeks after inoculation (P less than 0.025). Opsonic activity of serum against S. pneumoniae was evaluated in infected and uninfected chinchillas. The opsonic titer was significantly higher in infected animals sacrificed at six weeks than in uninfected controls. Although pneumococcal polysaccharide antigen was found by counterimmunoelectrophoresis in 25 of 30 middle ear effusions, it could not be detected in the serum from infected animals. Methods for infection and sacrifice of chinchillas yielded reproducible results. This model should permit evaluation of the pathologic response to other serotypes of S. pneumoniae and possibly to prophylactic and therapeutic regimes. | Experimental otitis media due to Streptococcus pneumoniae: immunopathogenic response in the chinchilla. Acute otitis media was produced in 110 chinchillas by inoculation of type 23 Streptococcus pneumoniae directly into the middle ear cavity by tympanotomy. During the first three days after inoculation, inflammatory cells were seen in the mucoperiosteum of the middle ear. After four to seven days, there was purulent exudation in the middle ear cavity, and 40% of the animals had pneumococcal meningitis and/or bacteremia. The middle ears were sterile in five of 28 animals sacrificed during the second week and in six of seven animals sacrificed at six weeks, although subepithelial changes persisted in the mucoperiosteum. Levels of antibody to S. pneumoniae in serum were measured by radioimmunoassay; mean values were 6.1 ng of pneumococcal antibody nitrogen/ml in 28 uninfected control animals and 16.5 ng of antibody nitrogen/ml in 29 animals sacrificed two weeks after inoculation (P less than 0.025). Opsonic activity of serum against S. pneumoniae was evaluated in infected and uninfected chinchillas. The opsonic titer was significantly higher in infected animals sacrificed at six weeks than in uninfected controls. Although pneumococcal polysaccharide antigen was found by counterimmunoelectrophoresis in 25 of 30 middle ear effusions, it could not be detected in the serum from infected animals. Methods for infection and sacrifice of chinchillas yielded reproducible results. This model should permit evaluation of the pathologic response to other serotypes of S. pneumoniae and possibly to prophylactic and therapeutic regimes. | [
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|
PMID:12239 | Inhibition of vitamin B12 binding to transcobalamin II at low pH: basis of a procedure for quantitation of circulating TC II and R binders. | A diminution in the binding of exogenous vitamin B12 by serum or plasma at pH 1.5 to 2 (acid-resistant binding capacity, ARBC) as compared with the binding capacity at neutral pH (unsaturated vitamin B12 binding capacity, UBBC) was observed. This phenomenon was found to be attributable to the absence of transcobalamin II (TC II)-associated vitamin B12 from serum labeled at low pH, as demonstrated by gel chromatography on Sephadex G-200. Further confirmation was obtained by demonstration of a significant correlation between the ARBC and the R binder content, quantitated as resistance to precipitation by ammonium sulfate at a 2M concentration. Serum labeled at acid pH failed to deliver vitamin B12 to Hela cells indicating absence of a "functional" TC II-B12 complex. The differing vitamin B12 binding capacities of neutral and acidified material was utilized to fractionate the unsaturated vitamin B12-binding proteins of serum and plasma. The ARBC was used to measure the R binder content, and TC II was calculated from the difference between UBBC and ARBC. The fractionation procedure was performed on 75 sera and showed increased ARBC in patients with myeloproliferative disorders and decreased ARBC in leukopenia. The content of unsaturated vitamin B12-binding protein was compared in 75 paired samples of serum and plasma collected from EDTA-anticoagulated blood containing sodium fluoride to inhibit release of granulocyte binders. The ARBC content of fluoridated plasma was significantly lower, due to decreased in vitro R binder release. Plasma also contained less TC II, possibly related to in vitro cellular uptake of this binder in fluoridated plasma. | Inhibition of vitamin B12 binding to transcobalamin II at low pH: basis of a procedure for quantitation of circulating TC II and R binders. A diminution in the binding of exogenous vitamin B12 by serum or plasma at pH 1.5 to 2 (acid-resistant binding capacity, ARBC) as compared with the binding capacity at neutral pH (unsaturated vitamin B12 binding capacity, UBBC) was observed. This phenomenon was found to be attributable to the absence of transcobalamin II (TC II)-associated vitamin B12 from serum labeled at low pH, as demonstrated by gel chromatography on Sephadex G-200. Further confirmation was obtained by demonstration of a significant correlation between the ARBC and the R binder content, quantitated as resistance to precipitation by ammonium sulfate at a 2M concentration. Serum labeled at acid pH failed to deliver vitamin B12 to Hela cells indicating absence of a "functional" TC II-B12 complex. The differing vitamin B12 binding capacities of neutral and acidified material was utilized to fractionate the unsaturated vitamin B12-binding proteins of serum and plasma. The ARBC was used to measure the R binder content, and TC II was calculated from the difference between UBBC and ARBC. The fractionation procedure was performed on 75 sera and showed increased ARBC in patients with myeloproliferative disorders and decreased ARBC in leukopenia. The content of unsaturated vitamin B12-binding protein was compared in 75 paired samples of serum and plasma collected from EDTA-anticoagulated blood containing sodium fluoride to inhibit release of granulocyte binders. The ARBC content of fluoridated plasma was significantly lower, due to decreased in vitro R binder release. Plasma also contained less TC II, possibly related to in vitro cellular uptake of this binder in fluoridated plasma. | [
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|
PMID:12240 | Properties and development of erythropoietic stem cells in the chick embryo. | 1. When injected into irradiated chickens, haemopoietic stem cells give rise to well-defined erythrocytic colonies in the host marrow. Such stem cells (CFU-M = Colony Forming Unit in Marrow) have been found in different tissue of the chicke embryo (yolk sac, blood, marrow). Analysis of the properties of CFU-M reveals that they represent two classes of stem cells: pluripotent stem cells mainly in adult marrow and erythrocytic-committed stem cells present in yolk sac. 2. Yolk sac contains the main pool of CFU-M during the major part of embryonic life. In the blood of 6-day-old embryo, there are three or four times more CFU-Ms than in the yolk sac; they are no longer detected in the blood after the 16th day of incubation. During development of the marrow, stem cells are actively differentiating and their total number remains the same from 16 days to hatching. | Properties and development of erythropoietic stem cells in the chick embryo. 1. When injected into irradiated chickens, haemopoietic stem cells give rise to well-defined erythrocytic colonies in the host marrow. Such stem cells (CFU-M = Colony Forming Unit in Marrow) have been found in different tissue of the chicke embryo (yolk sac, blood, marrow). Analysis of the properties of CFU-M reveals that they represent two classes of stem cells: pluripotent stem cells mainly in adult marrow and erythrocytic-committed stem cells present in yolk sac. 2. Yolk sac contains the main pool of CFU-M during the major part of embryonic life. In the blood of 6-day-old embryo, there are three or four times more CFU-Ms than in the yolk sac; they are no longer detected in the blood after the 16th day of incubation. During development of the marrow, stem cells are actively differentiating and their total number remains the same from 16 days to hatching. | [
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|
PMID:12241 | Temperature acclimation and oxygen-binding properties of blood and multiple haemoglobins of rainbow trout. | Acclimation of rainbow trout to 5, 15 and 22 degrees C for periods exceeding 4 months had no significant effect on the oxygen affinity of whole blood or on the concentration of ATP, which is the main organic phosphate in red cells. Slight differences were, however, found in the oxygenation properties of the haemolysates, which correlate with changes in the relative concentration of the multiple haemoglobins. The oxygen-binding properties of the main haemoglobin components account for the observed differences in the haemolysates. The possible thermoacclimatory significance of changes in haemoglobin multiplicity and co-factor concentrations is discussed. | Temperature acclimation and oxygen-binding properties of blood and multiple haemoglobins of rainbow trout. Acclimation of rainbow trout to 5, 15 and 22 degrees C for periods exceeding 4 months had no significant effect on the oxygen affinity of whole blood or on the concentration of ATP, which is the main organic phosphate in red cells. Slight differences were, however, found in the oxygenation properties of the haemolysates, which correlate with changes in the relative concentration of the multiple haemoglobins. The oxygen-binding properties of the main haemoglobin components account for the observed differences in the haemolysates. The possible thermoacclimatory significance of changes in haemoglobin multiplicity and co-factor concentrations is discussed. | [
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|
PMID:12242 | An electrophysiological study of mechanisms controlling polyp retraction in colonies of the scleractinian coral Goniopora lobata. | 1. Electrical or mechanical stimulation of Goniopora lobata produces coordinated retraction of polyps in the colony. With repetitive stimulation, the response spreads in linear, radial increments which become successively smaller with each stimulus. 2. Electrical activity recorded from these colonies is interpreted as originating in a conduction system responsible for effecting the colonial retraction response. The electrical activity spreads incrementally through the colony in a similar manner to the behavioural response. 3. Various hypotheses have been proposed to account for such a spread of electrical acitvity. Of these, only interneural facilitation is of appreciable importance to Goniopora. 4. Temporary termination of a pathway, by the passage of an impulse through it, was found and interpreted as being an additional and important property of the colonial conduction system. | An electrophysiological study of mechanisms controlling polyp retraction in colonies of the scleractinian coral Goniopora lobata. 1. Electrical or mechanical stimulation of Goniopora lobata produces coordinated retraction of polyps in the colony. With repetitive stimulation, the response spreads in linear, radial increments which become successively smaller with each stimulus. 2. Electrical activity recorded from these colonies is interpreted as originating in a conduction system responsible for effecting the colonial retraction response. The electrical activity spreads incrementally through the colony in a similar manner to the behavioural response. 3. Various hypotheses have been proposed to account for such a spread of electrical acitvity. Of these, only interneural facilitation is of appreciable importance to Goniopora. 4. Temporary termination of a pathway, by the passage of an impulse through it, was found and interpreted as being an additional and important property of the colonial conduction system. | [
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PMID:12243 | Possible involvement of monoamines in the release of adipokinetic hormone in the locust Schistocerca gregaria. | 1. The adipokinetic hormone release, which can be induced by anticholinesterases, is reduced by depleting the content of monoamines in the nervous system. 2. The participation of monoamines in the pathway of release of adipokinetic hormone is studied in vivo and in vitro. 3. A possible mechanism for anticholinesterase-induced release of this hormone involving cholinergic and aminergic transmission is postulated. | Possible involvement of monoamines in the release of adipokinetic hormone in the locust Schistocerca gregaria. 1. The adipokinetic hormone release, which can be induced by anticholinesterases, is reduced by depleting the content of monoamines in the nervous system. 2. The participation of monoamines in the pathway of release of adipokinetic hormone is studied in vivo and in vitro. 3. A possible mechanism for anticholinesterase-induced release of this hormone involving cholinergic and aminergic transmission is postulated. | [
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PMID:12244 | Oxygen dissociation curves of the blood of larval and adult lampreys (Lampetra fluviatilis). | 1. An electrolytic method was used to plot the oxygen dissociation curves of whole blood from both the larva and adult of the lamprey Lampetra fluviatilis at a temperature of 10 degrees C and over a pH range of 6-5-8-1. 2. Larval blood has a far higher affinity for oxygen than that of adults, the respective calculated P50's at a pH of 7-75 being 1-9 and 10-7 mmHg. 3. The high affinity of larval blood is of use to a relatively sedentary animal living in burrows, and the increased oxygen delivery pressure brought about by the shift of the curve to the right in the adult is of advantage to an animal exhibiting greater activity. 4. The n value obtained from the Hill plots increased with increasing saturation and were lower in larvae than adults at the same level of blood saturation. 5. The Bohr effect in larvae at 10 degrees C over the pH range 6-5-8-1 was --0-25, a value which did not differ significantly from the -0-22 found in adults. | Oxygen dissociation curves of the blood of larval and adult lampreys (Lampetra fluviatilis). 1. An electrolytic method was used to plot the oxygen dissociation curves of whole blood from both the larva and adult of the lamprey Lampetra fluviatilis at a temperature of 10 degrees C and over a pH range of 6-5-8-1. 2. Larval blood has a far higher affinity for oxygen than that of adults, the respective calculated P50's at a pH of 7-75 being 1-9 and 10-7 mmHg. 3. The high affinity of larval blood is of use to a relatively sedentary animal living in burrows, and the increased oxygen delivery pressure brought about by the shift of the curve to the right in the adult is of advantage to an animal exhibiting greater activity. 4. The n value obtained from the Hill plots increased with increasing saturation and were lower in larvae than adults at the same level of blood saturation. 5. The Bohr effect in larvae at 10 degrees C over the pH range 6-5-8-1 was --0-25, a value which did not differ significantly from the -0-22 found in adults. | [
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PMID:12245 | Specific transplantation tolerance induced by autoimmunization against the individual's own, naturally occurring idiotypic, antigen-binding receptors. | Serum or urine from normal adult Lewis rats can be shown to contain detectable amounts of idiotypic, antigen-binding receptors with specificity for the major histocompatibility complex locus antigens of the rat, the Ag-B locus antigens. Such purified naturally occurring receptor molecules, be they of T- or B-lymphocyte origin, can be used in a polymerized form to provoke the production of auto-anti-idiotypic antibodies when injected back into normal Lewis rats. As a consequence of this autoimmunity, lymphocytes of these Lewis rats can be shown to be depleted of cells carrying the relevant idiotypic receptors signifying reactivity against a given Ag-B locus-determined antigen(s). This specific lack of idiotypic lymphocytes is manifested as a selective loss of reactivity against the relevant Ag-B-incompatible antigens as measured by graft versus host or MLC reactions. Furthermore, autoimmune Lewis rats display specific transplantation tolerance against the skin grafts from the relevant strain, as demonstrated by specific prolongation of graft survival. A further indication of the specific tolerence state of these rats comes from the highly reduced ability to produce circulating antibodies against the relevant Ag-B antigens. No side effects of these autoimmunization procedures have been noted so far. It would thus seem clear that a prolonged state of specific transplantation tolerance can be achieved via autoimmunization against the individual's naturally occurring idiotypic, antigen-binding receptors. | Specific transplantation tolerance induced by autoimmunization against the individual's own, naturally occurring idiotypic, antigen-binding receptors. Serum or urine from normal adult Lewis rats can be shown to contain detectable amounts of idiotypic, antigen-binding receptors with specificity for the major histocompatibility complex locus antigens of the rat, the Ag-B locus antigens. Such purified naturally occurring receptor molecules, be they of T- or B-lymphocyte origin, can be used in a polymerized form to provoke the production of auto-anti-idiotypic antibodies when injected back into normal Lewis rats. As a consequence of this autoimmunity, lymphocytes of these Lewis rats can be shown to be depleted of cells carrying the relevant idiotypic receptors signifying reactivity against a given Ag-B locus-determined antigen(s). This specific lack of idiotypic lymphocytes is manifested as a selective loss of reactivity against the relevant Ag-B-incompatible antigens as measured by graft versus host or MLC reactions. Furthermore, autoimmune Lewis rats display specific transplantation tolerance against the skin grafts from the relevant strain, as demonstrated by specific prolongation of graft survival. A further indication of the specific tolerence state of these rats comes from the highly reduced ability to produce circulating antibodies against the relevant Ag-B antigens. No side effects of these autoimmunization procedures have been noted so far. It would thus seem clear that a prolonged state of specific transplantation tolerance can be achieved via autoimmunization against the individual's naturally occurring idiotypic, antigen-binding receptors. | [
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|
PMID:12246 | Respiratory behaviour of sea-urchin spermatozoa. I. Effect of pH and egg water on the respiratory rate. | Effects of pH and egg water on the respiration of sea-urchin spermatozoa were polarographically studied in three sea-urchins and one starfish species. Sea-urchin sperm respiration is extremely sensitive to change in the pH of the suspending medium over a wide range. In normal-sea water, the pH of the sperm suspension decreased from 8.02 to 7.62, after four to five minutes' incubation at 18 degrees C. The Respiratory Dilution Effect could be recognized in the same medium. However, when sea water was buffered with HEPES at pH 8.2, the Effect was no longer observed. The diffusate from egg water (jelly coat solution) brought about a striking increase in the respiration when added to moderately respiring spermatozoa in HEPES-sea water of pH values lower than 7.9. No inccrease in the respiration was observed when the diffusate was added to vigorously respiring spermatozoa in HEPES-sea water of pH values higher than 8.2. Sperm motility was also inhibited by acid pH, and this inhibition was reversed by the addition of the diffusate. It does not seem that there is any species-specificity among three sea-urchins and one starfish used. The role of the diffusate is discussed in relation to the penetration of spermatozoa through the jelly coat to the egg surface. | Respiratory behaviour of sea-urchin spermatozoa. I. Effect of pH and egg water on the respiratory rate. Effects of pH and egg water on the respiration of sea-urchin spermatozoa were polarographically studied in three sea-urchins and one starfish species. Sea-urchin sperm respiration is extremely sensitive to change in the pH of the suspending medium over a wide range. In normal-sea water, the pH of the sperm suspension decreased from 8.02 to 7.62, after four to five minutes' incubation at 18 degrees C. The Respiratory Dilution Effect could be recognized in the same medium. However, when sea water was buffered with HEPES at pH 8.2, the Effect was no longer observed. The diffusate from egg water (jelly coat solution) brought about a striking increase in the respiration when added to moderately respiring spermatozoa in HEPES-sea water of pH values lower than 7.9. No inccrease in the respiration was observed when the diffusate was added to vigorously respiring spermatozoa in HEPES-sea water of pH values higher than 8.2. Sperm motility was also inhibited by acid pH, and this inhibition was reversed by the addition of the diffusate. It does not seem that there is any species-specificity among three sea-urchins and one starfish used. The role of the diffusate is discussed in relation to the penetration of spermatozoa through the jelly coat to the egg surface. | [
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|
PMID:12247 | Respiratory behaviour of sea-urchin spermatozoa. II. Sperm-activating substance obtained from jelly coat of sea-urchin eggs. | A sperm-activating substance (SAS) was obtained from the jelly coat of sea-urchin ova and its chemical properties were investigated in three sea-urchin species. The SAS was partially purified from the jelly coat of Pseudocentrotus eggs through several steps of purification by procedures consisting of charcoal adsorption, ion-exchange chromatography on DEAE-Sephadex A-25 column, and gel-filtration on Sephadex G-15 columns. The partially purified SAS was found to contain a ninhydrin-positive material and is inactivated by pronase digestion. The molecular weight of SAS was estimated as about 630 by gel-filtration through Sephadex G-25 and the isoelectric-point of SAS is located at about pH 5.3 by isoelectrofocusing method. The SAS is non-volatile, alcohol-soluble, and labile in a diluted alkaline or acid solution. The origin of SAS is discussed. | Respiratory behaviour of sea-urchin spermatozoa. II. Sperm-activating substance obtained from jelly coat of sea-urchin eggs. A sperm-activating substance (SAS) was obtained from the jelly coat of sea-urchin ova and its chemical properties were investigated in three sea-urchin species. The SAS was partially purified from the jelly coat of Pseudocentrotus eggs through several steps of purification by procedures consisting of charcoal adsorption, ion-exchange chromatography on DEAE-Sephadex A-25 column, and gel-filtration on Sephadex G-15 columns. The partially purified SAS was found to contain a ninhydrin-positive material and is inactivated by pronase digestion. The molecular weight of SAS was estimated as about 630 by gel-filtration through Sephadex G-25 and the isoelectric-point of SAS is located at about pH 5.3 by isoelectrofocusing method. The SAS is non-volatile, alcohol-soluble, and labile in a diluted alkaline or acid solution. The origin of SAS is discussed. | [
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|
PMID:12254 | Deficiency of NADPH oxidase activity in chronic granulomatous disease. | NADPH oxidase activity was examined in paired 27,000 x g granule fractions isolated from normal polymorphonuclear leukocytes from patients with chronic granulomatous disease. At 0.17 mM NADPH, the oxidase activity was not measurable in normal resting cells but was activated by phagocytosis. This activation was absent in CGD cells. At higher levels of NADPH, activity was present in cells from patients with CGD, although it was lower than normal, and no difference in activity was found between resting and phagocytizing cells. Granule fractions from phagocytizing normal cells exhibited higher than granule fractions from resting normal cells at all levels of NADPH. These results suggest that NADPH oxidase activity is defective in chronic granulomatous disease, and further that the defect is not the absence of the enzyme but rather a failure to activate it. | Deficiency of NADPH oxidase activity in chronic granulomatous disease. NADPH oxidase activity was examined in paired 27,000 x g granule fractions isolated from normal polymorphonuclear leukocytes from patients with chronic granulomatous disease. At 0.17 mM NADPH, the oxidase activity was not measurable in normal resting cells but was activated by phagocytosis. This activation was absent in CGD cells. At higher levels of NADPH, activity was present in cells from patients with CGD, although it was lower than normal, and no difference in activity was found between resting and phagocytizing cells. Granule fractions from phagocytizing normal cells exhibited higher than granule fractions from resting normal cells at all levels of NADPH. These results suggest that NADPH oxidase activity is defective in chronic granulomatous disease, and further that the defect is not the absence of the enzyme but rather a failure to activate it. | [
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|
PMID:12255 | Development of the Timor filaria in Aedes togoi: preliminary observations. | Developmental stages of the Timor filaria recovered from experimentally infected Aedes togoi mosquitoes are described. Mosquitoes were dissected and examined for larvae beginning 1 1/2 days and continuing daily for 9 days after they had fed on a carrier on the island of Flores, Indonesia. Timor microfilariae develop rapidly to third-stage larvae within the thoracic muscles of A. togoi: the first molt occurs at 3 1/2 days, the second molt as early as 5 1/2 days, and infective forms are found at 6 1/2 to 7 1/2 days postfeeding. These larvae were compared with similar stages of subperiodic Brugia malayi recovered from A. togoi fed on an infected jird (Meriones unguiculatus) and the features distinguishing larvae of the Timor filaria from those of B. malayi are restricted to the tails of the first-stage forms. The terminal and subterminal nuclei of the Timor larva are generally smaller than those of B. malayi, and there is little if any bulge of the cuticle around them. A constriction of the tail between these nuclei is subtle or absent. The findings of this study support the view that the Timor filaria is a member of the Brugia complex. | Development of the Timor filaria in Aedes togoi: preliminary observations. Developmental stages of the Timor filaria recovered from experimentally infected Aedes togoi mosquitoes are described. Mosquitoes were dissected and examined for larvae beginning 1 1/2 days and continuing daily for 9 days after they had fed on a carrier on the island of Flores, Indonesia. Timor microfilariae develop rapidly to third-stage larvae within the thoracic muscles of A. togoi: the first molt occurs at 3 1/2 days, the second molt as early as 5 1/2 days, and infective forms are found at 6 1/2 to 7 1/2 days postfeeding. These larvae were compared with similar stages of subperiodic Brugia malayi recovered from A. togoi fed on an infected jird (Meriones unguiculatus) and the features distinguishing larvae of the Timor filaria from those of B. malayi are restricted to the tails of the first-stage forms. The terminal and subterminal nuclei of the Timor larva are generally smaller than those of B. malayi, and there is little if any bulge of the cuticle around them. A constriction of the tail between these nuclei is subtle or absent. The findings of this study support the view that the Timor filaria is a member of the Brugia complex. | [
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|
PMID:12256 | Acetylcholine synthesis in sympathetic human neuroblastoma. | The synthesis of acetylcholine, as well as catecholamines, was studied by assaying the activities of choline acetyltransferase (ChA) and tyrosine hydroxylase (TH) in the tumor tissues and the culture cells of human neuroblastoma. In the majority of 20 neuroblastomas of sympathetic origin, both ChA and TH activities were detected at a significantly high level. In the culture cells of five cell lines of human neuroblastoma, ChA activity was high, but TH was negative in four of the lines. However, it was observed that these enzyme activities changed significantly while in the long-term culture. ChA assay is a useful diagnostic test for neuroblastomas that synthesize acetylcholine. Future studies of neuroblastoma should consider cholinergic activity. | Acetylcholine synthesis in sympathetic human neuroblastoma. The synthesis of acetylcholine, as well as catecholamines, was studied by assaying the activities of choline acetyltransferase (ChA) and tyrosine hydroxylase (TH) in the tumor tissues and the culture cells of human neuroblastoma. In the majority of 20 neuroblastomas of sympathetic origin, both ChA and TH activities were detected at a significantly high level. In the culture cells of five cell lines of human neuroblastoma, ChA activity was high, but TH was negative in four of the lines. However, it was observed that these enzyme activities changed significantly while in the long-term culture. ChA assay is a useful diagnostic test for neuroblastomas that synthesize acetylcholine. Future studies of neuroblastoma should consider cholinergic activity. | [
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|
PMID:12258 | Some biological and pharmacological properties of inflammatory exudates. | Inflammatory exudates were obtained from polyester sponges which had been implanted subcutaneously in rats four days previously. This material was found to be anti-inflammatory when injected into other rats in which carrageenan pleurisy had been induced. At a dose of 600 mg kg-1 exudate inhibited the formation of pleural effusion, emigration of both neutrophils and mononuclear cells and the accumulation of beta-glucuronidase and lactic dehydrogenase. The same dose of sponge exudate did not however inhibit the increased vascular permeability induced in the rat skin or rat foot following injection of 5-hydroxytryptamine, histamine, prostaglandin E1, or bradykinin. Furthermore sponge exudate did not reduce the haemolytic complement titre of rat serum either in vivo or in vitro. The possible mechanism of anti-inflammatory action of exudate is discussed. | Some biological and pharmacological properties of inflammatory exudates. Inflammatory exudates were obtained from polyester sponges which had been implanted subcutaneously in rats four days previously. This material was found to be anti-inflammatory when injected into other rats in which carrageenan pleurisy had been induced. At a dose of 600 mg kg-1 exudate inhibited the formation of pleural effusion, emigration of both neutrophils and mononuclear cells and the accumulation of beta-glucuronidase and lactic dehydrogenase. The same dose of sponge exudate did not however inhibit the increased vascular permeability induced in the rat skin or rat foot following injection of 5-hydroxytryptamine, histamine, prostaglandin E1, or bradykinin. Furthermore sponge exudate did not reduce the haemolytic complement titre of rat serum either in vivo or in vitro. The possible mechanism of anti-inflammatory action of exudate is discussed. | [
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PMID:12259 | The role of copper in preventing gastrointestinal damage by acidic anti-inflammatory drugs. | The ability of several non-steroidal acidic anti-inflammatory drugs to cause ulceration when given as copper complexes has been examined. The damage caused by clopirac, niflumic acid and aspirin was virtually abolished when they were given as copper complexes whereas the damage caused by indomethacin, ketoprofen and (+)-naproxen was unaltered. The lack of ulceration with three of these preparations appeared to be correlated with a much reduced ability to inhibit prostaglandin synthesis as determined using an in vitro enzyme system. | The role of copper in preventing gastrointestinal damage by acidic anti-inflammatory drugs. The ability of several non-steroidal acidic anti-inflammatory drugs to cause ulceration when given as copper complexes has been examined. The damage caused by clopirac, niflumic acid and aspirin was virtually abolished when they were given as copper complexes whereas the damage caused by indomethacin, ketoprofen and (+)-naproxen was unaltered. The lack of ulceration with three of these preparations appeared to be correlated with a much reduced ability to inhibit prostaglandin synthesis as determined using an in vitro enzyme system. | [
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|
PMID:12260 | Methods for study of fluphenazine kinetics in man. | Fluphenazine and its principal metabolites, fluphenazine sulphoxide, and 7-hydroxyfluphenazine were identified and quantified in human plasma, urine and faeces following intramuscular and oral administration of 14C-fluphenazine dihydrochloride. The presence of a conjugate fraction was also noted. Unmetabolized fluphenazine was selectively extracted into n-heptane. The metabolites were separated by solvent extraction into toluene. Conjugates were hydrolysed back to fluphenazine, fluphenazne sulphoxide and 7-hydroxyfluphenazine. Fluphenazine and fluphenazine conjugates were also measured in the urine of patients receiving long term non-radioactive fluphenazine decanoate therapy. The urinary excretion rate of the conjugate fraction was systematically related to the plasma concentration, regardless of urine flow rate or pH, providing a convenient method for the assessment of fluphenazine kinetics by urinary excretion studies not involving administration of labelled drug. | Methods for study of fluphenazine kinetics in man. Fluphenazine and its principal metabolites, fluphenazine sulphoxide, and 7-hydroxyfluphenazine were identified and quantified in human plasma, urine and faeces following intramuscular and oral administration of 14C-fluphenazine dihydrochloride. The presence of a conjugate fraction was also noted. Unmetabolized fluphenazine was selectively extracted into n-heptane. The metabolites were separated by solvent extraction into toluene. Conjugates were hydrolysed back to fluphenazine, fluphenazne sulphoxide and 7-hydroxyfluphenazine. Fluphenazine and fluphenazine conjugates were also measured in the urine of patients receiving long term non-radioactive fluphenazine decanoate therapy. The urinary excretion rate of the conjugate fraction was systematically related to the plasma concentration, regardless of urine flow rate or pH, providing a convenient method for the assessment of fluphenazine kinetics by urinary excretion studies not involving administration of labelled drug. | [
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PMID:12261 | Potentiation of dopaminergic transmission by phosphodiesterase inhibitors and cyclic nucleotides. | Experiments were made to determine whether cyclic AMP plays a role in transmission at identified dopaminergic synapses in the water snail Planorbis corneus. Intracellular stimulation of a specific dopamine neuron produces direct inhibitory postsynaptic potentials (ipsps) in a number of other neurons. These ipsps, which are mediated by dopamine, were potentiated by as much as 120% by caffeine, theophylline or dibutyryl cyclic AMP, although they were unaffected by cyclic AMP and prostaglandin E1. Caffeine and theophylline also potentiated the inhibitory response to dopamine, applied to the postsynaptic neurons by perfusion or iontophoresis, but the effects were generally much smaller (maximum potentiation 30%). The results provide evidence that postsynaptic cyclic AMP is involved in transmission at these synapses, but that the phosphodiesterase inhibitors may also have a presynaptic effect. | Potentiation of dopaminergic transmission by phosphodiesterase inhibitors and cyclic nucleotides. Experiments were made to determine whether cyclic AMP plays a role in transmission at identified dopaminergic synapses in the water snail Planorbis corneus. Intracellular stimulation of a specific dopamine neuron produces direct inhibitory postsynaptic potentials (ipsps) in a number of other neurons. These ipsps, which are mediated by dopamine, were potentiated by as much as 120% by caffeine, theophylline or dibutyryl cyclic AMP, although they were unaffected by cyclic AMP and prostaglandin E1. Caffeine and theophylline also potentiated the inhibitory response to dopamine, applied to the postsynaptic neurons by perfusion or iontophoresis, but the effects were generally much smaller (maximum potentiation 30%). The results provide evidence that postsynaptic cyclic AMP is involved in transmission at these synapses, but that the phosphodiesterase inhibitors may also have a presynaptic effect. | [
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PMID:12262 | A simple technique for the frequent intravenous infusion of fluid without heparin into the rabbit. | A technique is described for the daily intravenous injection over 16 weeks in the rabbit. The system consists of a Teflon cannula passed down the external jugular vein with the tip in the superior vena cava. The cannula is joined at the point of entry to the jugular vein to a length of silicon rubber tubing, which is then passed subcutaneously to the forehead. The silicon tubing is terminated on a Luer needle hub, which is held in a simple Perspex plate secured subcutaneously between the rabbit's ears. The Luer hub is covered with a replaceable rubber cap through which injections may be made. With this system cannulae were maintained patent for 16 weeks by flushing once a day with Hanks' balanced salt solution, pH 7-4. | A simple technique for the frequent intravenous infusion of fluid without heparin into the rabbit. A technique is described for the daily intravenous injection over 16 weeks in the rabbit. The system consists of a Teflon cannula passed down the external jugular vein with the tip in the superior vena cava. The cannula is joined at the point of entry to the jugular vein to a length of silicon rubber tubing, which is then passed subcutaneously to the forehead. The silicon tubing is terminated on a Luer needle hub, which is held in a simple Perspex plate secured subcutaneously between the rabbit's ears. The Luer hub is covered with a replaceable rubber cap through which injections may be made. With this system cannulae were maintained patent for 16 weeks by flushing once a day with Hanks' balanced salt solution, pH 7-4. | [
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|
PMID:12263 | Anabolic and androgenic activities, in rat, of some nandrolone and androstanolone esters. | The anabolic and androgenic activities of the formate to undecanoate esters of nandrolone and formate to valerate esters of androstanolone, after intramuscular injection, have been determined in rat. The response to a given dose was measured as cumulative weight (the area under the plot of weight of indicator organ against time). Levator anus muscle was used to assess anabolic activity, and the sum of the cumulative weight for prostate and seminal vesicles for androgenic activity. Log dose-log cumulative weights plots were parallel, and biological activities were expressed as the cumulative weight corresponding to a 2 muM dose, calculated from the regression lines. Anabolic-androgenic ratios for both series were calculated and were found to be minimum in the region of the propionate and butyrate. The anabolic-androgenic ratios of the nandrolone esters continued to increase after the minimum, as the series ascended. This method is believed to give a reliable assessment of anabolic and androgenic activities of steroid esters. | Anabolic and androgenic activities, in rat, of some nandrolone and androstanolone esters. The anabolic and androgenic activities of the formate to undecanoate esters of nandrolone and formate to valerate esters of androstanolone, after intramuscular injection, have been determined in rat. The response to a given dose was measured as cumulative weight (the area under the plot of weight of indicator organ against time). Levator anus muscle was used to assess anabolic activity, and the sum of the cumulative weight for prostate and seminal vesicles for androgenic activity. Log dose-log cumulative weights plots were parallel, and biological activities were expressed as the cumulative weight corresponding to a 2 muM dose, calculated from the regression lines. Anabolic-androgenic ratios for both series were calculated and were found to be minimum in the region of the propionate and butyrate. The anabolic-androgenic ratios of the nandrolone esters continued to increase after the minimum, as the series ascended. This method is believed to give a reliable assessment of anabolic and androgenic activities of steroid esters. | [
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|
PMID:12264 | The adhesion of film coatings to tablet surfaces--instrumentation and preliminary evaluation. | The strength of the adhesive bond between a film coating and a tablet surface has been studied using a specially designed tensile testing apparatus. The adhesion has been taken as the force required to remove the film from unit area of the tablet surface and has been shown to be dependent on the compression pressure used to prepare the tablet and on changes in the film formulation. Although plasticizers did not show any significant effect on the adhesion of a hydroxypropyl methylcellulose film, a reduction of 45% was found on the addition of 10% w/w titanium dioxide. | The adhesion of film coatings to tablet surfaces--instrumentation and preliminary evaluation. The strength of the adhesive bond between a film coating and a tablet surface has been studied using a specially designed tensile testing apparatus. The adhesion has been taken as the force required to remove the film from unit area of the tablet surface and has been shown to be dependent on the compression pressure used to prepare the tablet and on changes in the film formulation. Although plasticizers did not show any significant effect on the adhesion of a hydroxypropyl methylcellulose film, a reduction of 45% was found on the addition of 10% w/w titanium dioxide. | [
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PMID:12265 | Size analysis of metered suspension pressurized aerosols with the Quantimet 720. | A method is described for particle sizing of pressurized metered suspension aerosols by collection in a settling drum followed by microscopic evaluation of the slides with a Quantimet 720 automatic image analyser. The method gives satisfactory representation of the distribution of particles settling to the drum base, and demonstrates the excellent stability and reproducibility between and within aerosol packs for two widely used inhalation products. There is much drug deposition of somewhat finer size distribution on the wall of the drum than on the drum base. In spite of this wall loss, the method gives only slightly higher results for the weight and number mean diameters, than when both wall and base distributions are considered. The Quantimet was found to be suitable for particle sizing salbutamol used in preparing aerosol products. | Size analysis of metered suspension pressurized aerosols with the Quantimet 720. A method is described for particle sizing of pressurized metered suspension aerosols by collection in a settling drum followed by microscopic evaluation of the slides with a Quantimet 720 automatic image analyser. The method gives satisfactory representation of the distribution of particles settling to the drum base, and demonstrates the excellent stability and reproducibility between and within aerosol packs for two widely used inhalation products. There is much drug deposition of somewhat finer size distribution on the wall of the drum than on the drum base. In spite of this wall loss, the method gives only slightly higher results for the weight and number mean diameters, than when both wall and base distributions are considered. The Quantimet was found to be suitable for particle sizing salbutamol used in preparing aerosol products. | [
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|
PMID:12266 | Size analysis of suspension inhalation aerosols by inertial separation methods. | The particle size distribution of beclomethasone dipropionate (BDP) aerosols delivered from pressurized metered dose suspension inhalers has been measured with three cascaded inertial separation instruments, the Casella Cascade Impactor, Multistage Liquid Impinger and Cascade Centripeter. Various methods for collecting the emitted aerosol before measurement have been examined. A bent glass tubular 'throat', used as a simulated oro-pharynx, collects 35-60% of the emitted dose by impingement of the wet spray cone in the throat. The aerosol passing through the throat has a similar but somewhat finer size distribution to that collected by firing directly into a large flask. The three cascaded instruments give similar results which in the Multistage Liquid Impinger also resemble those given by a salbutamol inhaler. The mass fraction (35-60%) emitted from the oral adaptor which is of a size capable of deep lung penetration ( less than 4 mum) is much higher than the fraction (10-16%) found in the lungs of dogs after inhalation of aerosol. The size distributions resemble those determined by microscopy and are expressed as aerodynamic sizes, thus showing that the particles approximate to unit density spheres. The performance of two simpler devices, Kirk's apparatus and the Harwell size selective air sampler are also assessed, the latter shows some promise for the simple evaluation of the respirable fraction of inhalation aerosols. | Size analysis of suspension inhalation aerosols by inertial separation methods. The particle size distribution of beclomethasone dipropionate (BDP) aerosols delivered from pressurized metered dose suspension inhalers has been measured with three cascaded inertial separation instruments, the Casella Cascade Impactor, Multistage Liquid Impinger and Cascade Centripeter. Various methods for collecting the emitted aerosol before measurement have been examined. A bent glass tubular 'throat', used as a simulated oro-pharynx, collects 35-60% of the emitted dose by impingement of the wet spray cone in the throat. The aerosol passing through the throat has a similar but somewhat finer size distribution to that collected by firing directly into a large flask. The three cascaded instruments give similar results which in the Multistage Liquid Impinger also resemble those given by a salbutamol inhaler. The mass fraction (35-60%) emitted from the oral adaptor which is of a size capable of deep lung penetration ( less than 4 mum) is much higher than the fraction (10-16%) found in the lungs of dogs after inhalation of aerosol. The size distributions resemble those determined by microscopy and are expressed as aerodynamic sizes, thus showing that the particles approximate to unit density spheres. The performance of two simpler devices, Kirk's apparatus and the Harwell size selective air sampler are also assessed, the latter shows some promise for the simple evaluation of the respirable fraction of inhalation aerosols. | [
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|
PMID:12267 | An investigation into the deposition of inhalation aerosol particles as a function of air flow rate in a modified 'Kirk Lung'. | The effect of air flow rate on the deposition of inhalation aerosol particles in a modified 'Kirk Lung' has been studied. Two commercial products were used. The amount depositied in the mouthpiece and throat regions decreases with increasing flow rate. The amount in the collector rises to maximum of approximately 50%. This material represents the therapeutically available portion. Such an apparatus would be useful for routine quality control of the size distribution ratios for inhalation aerosol particles. | An investigation into the deposition of inhalation aerosol particles as a function of air flow rate in a modified 'Kirk Lung'. The effect of air flow rate on the deposition of inhalation aerosol particles in a modified 'Kirk Lung' has been studied. Two commercial products were used. The amount depositied in the mouthpiece and throat regions decreases with increasing flow rate. The amount in the collector rises to maximum of approximately 50%. This material represents the therapeutically available portion. Such an apparatus would be useful for routine quality control of the size distribution ratios for inhalation aerosol particles. | [
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PMID:12268 | The in vitro dissolution of phenobarbitone sodium from ethyl cellulose microcapsules. | Microcapsules of sodium phenobarbitone, with a wall of ethyl cellulose, have been prepared. The size distribution was determined by use of standard sieves and the effect of coreWALL ratio noted. Release of the drug into an aqueous medium was studied. The release pattern was found to have similar characteristics to the release of a drug from an insoluble porous matrix. | The in vitro dissolution of phenobarbitone sodium from ethyl cellulose microcapsules. Microcapsules of sodium phenobarbitone, with a wall of ethyl cellulose, have been prepared. The size distribution was determined by use of standard sieves and the effect of coreWALL ratio noted. Release of the drug into an aqueous medium was studied. The release pattern was found to have similar characteristics to the release of a drug from an insoluble porous matrix. | [
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PMID:12269 | The granulation of binary mixtures: the effects of the properties of the component powders on granules. | Sulphanilamide and citric acid individually and in various proportions with lactose, have been granulated by massing and screening. There was an optimum blend, that produced granules of maximum mean size and strength, for each binary system examined. The proportion of the components of this optimal blend was dependent on the physical properties of the second component in a mixture with lactose. Results from three systems, lactose:boric acid, lactose:sulphanilamide and lactose:citric acid indicate that although part dissolution of powder during granulation is a factor affecting granule properties, in some systems other physical properties of the second component may become dominant. It is suggested that the combined effect of cohesiveness and wettability of the powders may make the major contribution to granule strength with the sulphanilamide systems. The ultimate mean granule size produced is determined by the wettability or solubiluty of the powders, or both, in all cases examined. The great affinity of citric acid for aqueous binder solution was the dominant factor determining the properties of granules prepared from lactose:citric acid mixtures. | The granulation of binary mixtures: the effects of the properties of the component powders on granules. Sulphanilamide and citric acid individually and in various proportions with lactose, have been granulated by massing and screening. There was an optimum blend, that produced granules of maximum mean size and strength, for each binary system examined. The proportion of the components of this optimal blend was dependent on the physical properties of the second component in a mixture with lactose. Results from three systems, lactose:boric acid, lactose:sulphanilamide and lactose:citric acid indicate that although part dissolution of powder during granulation is a factor affecting granule properties, in some systems other physical properties of the second component may become dominant. It is suggested that the combined effect of cohesiveness and wettability of the powders may make the major contribution to granule strength with the sulphanilamide systems. The ultimate mean granule size produced is determined by the wettability or solubiluty of the powders, or both, in all cases examined. The great affinity of citric acid for aqueous binder solution was the dominant factor determining the properties of granules prepared from lactose:citric acid mixtures. | [
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PMID:12368 | Stereochemical studies of adrenergic drugs. Optically active derivatives of imidazolines. | The synthesis of (R)-(+)-4-methyl-2-(1-naphthylmethyl)imidazoline hydrochloride (2) and (S)-(-)-4-methyl-2-(1-naphthylmethyl)imidazoline hydrochloride (3) is presented. The synthesis involves the preparation of (R)-(+)- and (S)-(-)-1,2-diaminopropane dihydrochloride and then allowing the appropriate diaminopropane to react with ethyl 1-naphthyliminoacetate hydrochloride in the presence of triethylamine. The parent compound, naphazoline, is a potent alpha-adrenoreceptor agonist (-log ED50 = 7.22), whereas the methylated derivatives, 2 and 3, were moderately potent antagonists (pA2 = 5.6 and 5.8, respectively) of the alpha-adrenoreceptor. Compounds 2 and 3 also produced blockade of the response to histamine on the rabbit aorta, but at concentrations approximately 20 times higher than necessary to produce equal blockade of the alpha-adrenoreceptor. | Stereochemical studies of adrenergic drugs. Optically active derivatives of imidazolines. The synthesis of (R)-(+)-4-methyl-2-(1-naphthylmethyl)imidazoline hydrochloride (2) and (S)-(-)-4-methyl-2-(1-naphthylmethyl)imidazoline hydrochloride (3) is presented. The synthesis involves the preparation of (R)-(+)- and (S)-(-)-1,2-diaminopropane dihydrochloride and then allowing the appropriate diaminopropane to react with ethyl 1-naphthyliminoacetate hydrochloride in the presence of triethylamine. The parent compound, naphazoline, is a potent alpha-adrenoreceptor agonist (-log ED50 = 7.22), whereas the methylated derivatives, 2 and 3, were moderately potent antagonists (pA2 = 5.6 and 5.8, respectively) of the alpha-adrenoreceptor. Compounds 2 and 3 also produced blockade of the response to histamine on the rabbit aorta, but at concentrations approximately 20 times higher than necessary to produce equal blockade of the alpha-adrenoreceptor. | [
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|
PMID:12369 | Effects of staphylococcal products on locomotion and chemotaxis of human blood neutrophils and monocytes. | The effects of staphylococcal products as chemo-attractants for human blood neutrophils and monocytes and as inhibitors of locomotion of these cells were studied with bacterial cells, culture filtrates and isoelectrically focused fractions from culture filtrates of nine strains of Staphylococcus aureus. Little direct chemotactic activity of staphylococcal products for neutrophils was observed, although a chloroform-soluble extract of the whole organisms contained such activity. The major chemotactic effect of staphylococci for neutrophils was indirect, i.e., generated when the organisms or their products were incubated with plasma, perhaps due to activation of complement. In contrast, direct chemotactic activity for monocytes was found in a large number of staphylococcal fractions. Staphylococci also produced inhibitors of locomotion of both neutrophils and monocytes. Isoelectric focusing showed more fractions inhibitory for neutrophils than for monocytes. Some of the inhibitors could be identified. Staphylococcal alpha-toxin inhibited migration of both neutrophils and monocytes. Sphingomyelinase C (beta toxin) inhibited migration of monocytes but not of neutrophils. Leucocidin-rich strains were strongly active as inhibitors of neutrophil locomotion but less so as inhibitors of monocyte locomotion. | Effects of staphylococcal products on locomotion and chemotaxis of human blood neutrophils and monocytes. The effects of staphylococcal products as chemo-attractants for human blood neutrophils and monocytes and as inhibitors of locomotion of these cells were studied with bacterial cells, culture filtrates and isoelectrically focused fractions from culture filtrates of nine strains of Staphylococcus aureus. Little direct chemotactic activity of staphylococcal products for neutrophils was observed, although a chloroform-soluble extract of the whole organisms contained such activity. The major chemotactic effect of staphylococci for neutrophils was indirect, i.e., generated when the organisms or their products were incubated with plasma, perhaps due to activation of complement. In contrast, direct chemotactic activity for monocytes was found in a large number of staphylococcal fractions. Staphylococci also produced inhibitors of locomotion of both neutrophils and monocytes. Isoelectric focusing showed more fractions inhibitory for neutrophils than for monocytes. Some of the inhibitors could be identified. Staphylococcal alpha-toxin inhibited migration of both neutrophils and monocytes. Sphingomyelinase C (beta toxin) inhibited migration of monocytes but not of neutrophils. Leucocidin-rich strains were strongly active as inhibitors of neutrophil locomotion but less so as inhibitors of monocyte locomotion. | [
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-0.06597975641489029,
-0.09457030147314072,
0.06512690335512161,
0.047381043434143066
]
|
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