Catalysis of the reaction: NAD(P)+ + androsterone = NAD(P)H + H+ + 5-alpha-androstane-3,17-dione. The reaction is B-specific (i.e. the pro-S hydrogen is transferred from the 4-position of reduced nicotinamide cofactor) with respect to NAD(P)+. [EC:1.1.1.50, MetaCyc:1.1.1.50-RXN]
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M5: Ontology GO: Gene Ontology GO:MF: GO Molecular Function