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Biochem J. Oct 15, 1985; 231(2): 407–416.
PMCID: PMC1152761

Membrane-bound lactate dehydrogenases and mandelate dehydrogenases of Acinetobacter calcoaceticus. Purification and properties.

Abstract

Procedures were developed for the optimal solubilization of D-lactate dehydrogenase, D-mandelate dehydrogenase, L-lactate dehydrogenase and L-mandelate dehydrogenase from wall + membrane fractions of Acinetobacter calcoaceticus. D-Lactate dehydrogenase and D-mandelate dehydrogenase were co-eluted on gel filtration, as were L-lactate dehydrogenase and L-mandelate dehydrogenase. All four enzymes could be separated by ion-exchange chromatography. D-Lactate dehydrogenase and D-mandelate dehydrogenase were purified by cholate extraction, (NH4)2SO4 fractionation, gel filtration, ion-exchange chromatography and chromatofocusing. The properties of D-lactate dehydrogenase and D-mandelate dehydrogenase were similar in several respects: they had relative molecular masses of 62 800 and 59 700 respectively, pI values of 5.8 and 5.5, considerable sensitivity to p-chloromercuribenzoate, little or no inhibition by chelating agents, and similar responses to pH. Both enzymes appeared to contain non-covalently bound FAD as cofactor.

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