3beta(or 20alpha)-hydroxysteroid dehydrogenase

In enzymology, a 3-β(or 20-α)-hydroxysteroid dehydrogenase is an enzyme that catalyzes the chemical reaction


 * 5α-androstan-3β,17β-diol + NADP+ $$\rightleftharpoons$$ 17β-hydroxy-5α-androstan-3-one + NADPH + H+

This enzyme possesses the combined activities of the 3-β-hydroxysteroid dehydrogenase/Δ-5-4 isomerase and 20-α-hydroxysteroid dehydrogenase enzymes.