Purification and properties of glycerol:NADP+ 2-oxidoreductase from Schizosaccharomyces pombe.

Abstract

Glycerol:NADP+ 2-oxidoreductase (EC 1.1.1.156) was isolated from Schizosaccharomyces pombe, purified and characterized. It had an Mr of 57,000, and SDS-PAGE revealed two polypeptides, of Mr 25,000 and 30,000. Its coenzyme requirement was satisfied exclusively by NADP. The pH optimum for glycerol oxidation was 9.5, for dihydroxyacetone reduction 6.0. Rates of oxidation with some structurally related diols were three- to six-fold lower than for glycerol, while glyceraldehyde and other carbonyl compounds showed negligible rates of reduction. Neither monovalent nor divalent cations activated the enzyme. Apparent Km and Vmax values were determined. The enzyme is similar to glycerol dehydrogenases isolated from Mucor javanicus and from Dunaliella parva but differs considerably from the glycerol:NAD+ 2-oxidoreductase of S. pombe.