Abstract
1. Yeast alcohol dehydrogenase has been found to react with NADH in the presence of acetamide to form a highly fluorescent ternary complex. Titration of the enzyme to form this complex has provided a method for the estimation of the number of binding sites on the enzyme. 2. The binding of NADH by the enzyme has been studied independently, with a modified form of equilibrium dialysis, by using gel filtration. 3. A third method, depending upon the formation of a ternary complex of enzyme, hydroxylamine and pyridine-3-aldehyde–adenine dinucleotide, has also been used to titrate the enzyme. 4. Values obtained with all three methods are substantially in agreement that only three coenzyme-binding sites are available. This is in contrast with the established fact that the enzyme is composed of four identical subunits.
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Selected References
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