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. 1975 Mar;145(3):581–590. doi: 10.1042/bj1450581

Evidence for a histidine and a cysteine residue in the substrate-binding site of yeast alcohol dehydrogenase.

V Leskovac, D Pavkov-Pericin
PMCID: PMC1165260  PMID: 168872

Abstract

1. Yeast alcohol dehydrogenase (EC 1.1.1.1) is inhibited by stoicheiometric concentrations of diethyl pyrocarbonate. The inhibition is due to the acylation of a single histidine residue/monomer (mol.wt. 36000). 2. Alcohol dehydrogenase is also inhibited by stoicheiometric amounts of 5,5'-dithiobis-(2-nitrobenzoate), owing to the modification of a single cysteine residue/monomer. 3. Native alcohol dehydrogenase binds two molecules of reduced coenzyme/molecule of enzyme (mol.wt. 144000). 4. Modification of a single histidine residue/monomer by treatment with diethyl pyrocarbonate prevents the binding of acetamide in the ternary complex, enzyme-NADH-acetamede, but does not prevent the binding of NADH to the enzyme. 5. Modification of a single cysteine residue/monomer does not prevent the binding of acetamide to the ternary complex. After the modification of two thiol groups/monomer by treatment with 5,5'-dithiobis-(2-nitrobenzoate), the capacity of enzyme to bind coenzyme in the ternary complex was virtually abolished. 6. From the results presented in this paper we conclude that at least one histidine and one cysteine residue are closely associated in the substrate-binding site of alcohol dehydrogenase.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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