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一项关于酵母醇脱氢酶催化烟酰胺腺嘌呤二核苷酸氧化正丁醇和丙醇-2的研究。

A study of the oxidation of butan-1-ol and propan-2-ol by nicotinamide-adenine dinucleotide catalysed by yeast alcohol dehydrogenase.

作者信息

Dickenson C J, Dickinson F M

出版信息

Biochem J. 1975 Jun;147(3):541-7. doi: 10.1042/bj1470541.

Abstract
  1. The kinetics of oxidation of butan-1-ol and propan-2-ol by NAD+, catalysed by yeast alcohol dehydrogenase, were studied at 25 degrees C from pH 5.5 to 10, and at pH 7.05 from 14 degrees to 44 degrees C, 2. Under all conditions studied the results are consistent with a mechanism whereby some dissociation of coenzyme from the active enzyme-NAD+-alcohol ternary complexes occurs, and the mechanism is therefore not strictly compulsory order. 3. A primary 2H isotopic effect on the maximum rates of oxidation of [1-2H2]butan-1-ol and [2H7]propan-2-ol was found at 25 degrees C over the pH range 5.5-10. Further, in stopped-flow experiments at pH 7.05 and 25 degrees C, there was no transient formation of NADH in the oxidation of butan-1-ol and propan-2-ol. The principal rate-limiting step in the oxidation of dependence on pH of the maximum rates of oxidation of butan-1-ol and propan-2-ol is consisten with the possibility that histidine and cysteine residues may affect or control catalysis.
摘要
  1. 在25℃下,pH值从5.5到10,以及在pH 7.05、温度从14℃到44℃的条件下,研究了酵母醇脱氢酶催化的NAD⁺氧化正丁醇和2-丙醇的动力学。2. 在所有研究条件下,结果都符合一种机制,即辅酶从活性酶-NAD⁺-醇三元复合物中发生某种解离,因此该机制并非严格的强制顺序。3. 在25℃、pH范围5.5 - 10内,发现了[1-²H₂]正丁醇和[²H₇]2-丙醇氧化最大速率的一级²H同位素效应。此外,在pH 7.05和25℃的停流实验中,正丁醇和2-丙醇氧化过程中没有NADH的瞬态形成。正丁醇和2-丙醇氧化最大速率对pH的依赖性中,主要的限速步骤与组氨酸和半胱氨酸残基可能影响或控制催化作用的可能性一致。

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Yeast alcohol dehydrogenase structure and catalysis.酵母醇脱氢酶的结构与催化。
Biochemistry. 2014 Sep 16;53(36):5791-803. doi: 10.1021/bi5006442. Epub 2014 Sep 3.

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