Reference: Dickenson CJ and Dickinson FM (1975) The role of an essential histidine residue of yeast alcohol dehydrogenase. Eur J Biochem 52(3):595-603

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Abstract


1. Inactivation of yeast alcohol dehydrogenase for diethyl pyrocarbonate indicates that one histidine residue per enzyme subunit is necessary for enzymic activity. The inactivated enzyme regains its activity over a period of days. 2. Enzyme modified by diethyl pyrocarbonate can form the binary enzyme - NADH complex with the same maximum NADH-binding capacity as that of native enzyme. Modified enzyme cannot form normal ternary complexes of the type enzyme - NADH - acetamide and enzyme - NAD+ - pyrazole, which are characteristic of native enzyme. 3. The rate constant for the reaction of enzyme with diethyl pyrocarbonate has been determined over the pH range 5.5--9. The histidine residue involved has approximately the same pKa as free histidine, but is 10-fold more reactive than free histidine.

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Dickenson CJ, Dickinson FM
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