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Biochimica et Biophysica Acta (BBA) - Specialized Section on Enzymological Subjects最新文献

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Some inhibitors of d-3-hydroxybutyrate dehydrogenase d-3-羟基丁酸脱氢酶的一些抑制剂
Pub Date : 1964-10-23 DOI: 10.1016/0926-6569(64)90282-2
M.N. Berry
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引用次数: 9
A possible explanation for the ATP “jump” observed on addition of ADP to mitochondria in State 4 一种可能的解释ATP“跳跃”观察到的ADP添加到线粒体在状态4
Pub Date : 1964-10-23 DOI: 10.1016/0926-6569(64)90291-3
K. Van Dam
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引用次数: 8
Hemediglutathione, a synthetic compound with peroxidase-like activity 血红素谷胱甘肽,具有过氧化物酶样活性的合成化合物
Pub Date : 1964-10-23 DOI: 10.1016/0926-6569(64)90294-9
Anthony T. Tu
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引用次数: 5
Respiratory control in guinea-pig-mammary gland mitochondria 豚鼠乳腺线粒体的呼吸控制
Pub Date : 1964-10-23 DOI: 10.1016/0926-6569(64)90285-8
Ronald A. Butow, Walter L. Nelson
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引用次数: 4
Phosphoglucomutase: a model for active-site characterization I. Amino acid composition 磷酸葡萄糖糖化酶:活性位点表征的模型
Pub Date : 1964-10-23 DOI: 10.1016/0926-6569(64)90286-X
N.H. Sloane , D.W. Mercer, M. Danoff
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引用次数: 6
Control of isoleucine, valine and leucine biosynthesis 控制异亮氨酸、缬氨酸和亮氨酸的生物合成
Pub Date : 1964-10-23 DOI: 10.1016/0926-6569(64)90278-0
R.H. Bauerle, M. Freundlich, F.C. Størmer, H.E. Umbarger

Acetohydroxy acid synthetase, which catalyzes the synthesis of α-acetolactate and α-acetohydroxybutyrate, the first 5- and 6-carbon precursors of valine and isoleucine, respectively, has been studied in extracts of Salmonella typhimurium. Required for enzyme activity are thiamine pyrophosphate, Mg2+ and an unidentified factor which can be supplied by boiled extracts of Salmonella or yeast. The activity of the enzyme is inhibited by l-valine and a group of related compounds. Valine inhibition is noncompetitive with respect to pyruvate and thiamine pyrophosphate and is rigidly dependent on pH. Inhibition is greatest at pH 8.0, also the optimal pH for activity, and is non-existent at values less than 6.5. The sensitivity of the enzyme to valine can be removed by heat, Hg2+ or urea treatments. Glutathione is effective in restoring valine sensitivity to the Hg2+-treated enzyme. These properties indicate that this enzyme belongs to the class of proteins recently described as “allosteric” in nature.

研究了鼠伤寒沙门氏菌提取物中乙酰羟基酸合成酶,该酶能催化α-乙酰乳酸酯和α-乙酰羟基丁酸酯的合成,α-乙酰羟基丁酸酯分别是缬氨酸和异亮氨酸的5碳前体和6碳前体。酶活性所需的是焦磷酸硫胺素、Mg2+和一种未知因子,可由沙门氏菌或酵母的煮沸提取物提供。该酶的活性受到l-缬氨酸和一组相关化合物的抑制。缬氨酸对丙酮酸盐和焦磷酸硫胺素的抑制作用是非竞争性的,并且严格依赖于pH。pH值为8.0时,抑制作用最大,也是活性的最佳pH值,当pH值小于6.5时,抑制作用不存在。酶对缬氨酸的敏感性可以通过加热、Hg2+或尿素处理去除。谷胱甘肽在恢复对Hg2+处理酶的缬氨酸敏感性方面是有效的。这些性质表明,这种酶属于最近在自然界被描述为“变构”的一类蛋白质。
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引用次数: 84
Properties of the hydrogenase of scenedesmus 田葵氢化酶的性质
Pub Date : 1964-10-23 DOI: 10.1016/0926-6569(64)90268-8
Hyman Hartman , Alvin I. Krasna

  • 1.

    1. The adaptation of hydrogenase (EC 1.98.1.1) in Scenedesnus obliquus was inhibited by dithionite, sulfite, arsenite, marphaside, BAL, 2,2′-dipyridyl, and 1,10-phenanthroline. None of these inhibitors had any effect on the active hydrogenase after adaptation.

  • 2.

    2. The active hydrogenase of Scenedesmus was inhibited by silver, mercury, and cupric ions, p-chloromercuribenzoate and iodoacetamide. The silver and mercury inhibition could be reversed by BAL.

  • 3.

    3. The hydrogenase of Proteus vulgaris was not affected by the inhibitors of the adaptation process but was inhibited by those reagents which inhibited the active hydrogenase of Scenedesmus.

1.1. 二亚硝酸盐、亚硫酸盐、亚砷酸盐、马phaside、BAL、2,2′-二吡啶和1,10-菲罗啉抑制了Scenedesnus obliquus加氢酶(EC 1.98.1.1)的适应性。这些抑制剂对适应后的活性氢化酶没有任何影响。银、汞、铜离子、对氯汞苯甲酸酯和碘乙酰胺均能抑制花青菜的活性氢化酶。BAL.3.3可逆转银和汞的抑制作用。普通变形杆菌(Proteus vulgaris)的氢化酶不受适应过程抑制剂的影响,而受抑制活性氢化酶的试剂的抑制。
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引用次数: 18
Étude cinétique comparée de l'hydrolyse trypsique des lactoglobulines A et B fonction du pH 乳球蛋白A和β在pH值函数下锥虫水解的动力学比较研究
Pub Date : 1964-10-23 DOI: 10.1016/0926-6569(64)90274-3
Monique Monnot, Jeannine Yon

The tryptic hydrolysis of lactoglobulins A and B is followed for different pH values. The variations of the kinetic contants according to the pH, give us some information on the reaction mechanism. During the intermediary complex formation, the enzyme associating with the lactoglobulin (A or B form) induces the Tanford transformation of the substrate molecule with demasking of the anomalous carboxylic groups thereby facilitating their ionization.

在不同的pH值下观察乳球蛋白A和B的胰蛋白酶水解。动力学含量随pH值的变化,给我们提供了一些反应机理的信息。在中间复合物形成过程中,与乳球蛋白(A型或B型)结合的酶诱导底物分子的坦福德转化,使异常羧基消失,从而促进其电离。
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引用次数: 5
Energy requirement for the anaerobic oxidation of acetate in baker's yeast 面包酵母中醋酸厌氧氧化的能量需求
Pub Date : 1964-10-23 DOI: 10.1016/0926-6569(64)90289-5
A.O.M. Stoppani, A. Bennun, E.M. De Pahn
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引用次数: 6
The effect of proteolytic enzymes on synthetic polypeptides 蛋白水解酶对合成多肽的影响
Pub Date : 1964-10-23 DOI: 10.1016/0926-6569(64)90296-2
Elizabeth R. Simons, Elkan R. Blout
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引用次数: 7
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