Tags: Enzyme.
3(or 17)alpha-hydroxysteroid dehydrogenase (EC 1.1.1.209 3(17)alpha-hydroxysteroid dehydrogenase) is an enzyme with system name 3(or 17)alpha-hydroxysteroid:NAD(P)+ oxidoreductase. This enzyme catalyses the chemical reaction androsterone + NAD(P)+ 5alpha-androstane-317-dione + NAD(P)H + H+This enzyme acts on the 3alpha-hydroxy group of androgens of the 5alpha-androstane series; and also more slowly on the 17alpha-hydroxy group of both androgenic and estrogenic substrates (cf.