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3beta-hydroxy-5beta-steroid dehydrogenase

In enzymology, a 3beta-hydroxy-5beta-steroid dehydrogenase () is an enzyme that catalyzes the chemical reaction

:3beta-hydroxy-5beta-pregnane-20-one + NADP ightleftharpoons 5beta-pregnan-3,20-dione + NADPH + H

Thus, the two substrates of this enzyme are 3beta-hydroxy-5beta-pregnane-20-one and NADP, whereas its 3 products are 5beta-pregnan-3,20-dione, NADPH, and H.

This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD or NADP as acceptor. The systematic name of this enzyme class is 3beta-hydroxy-5beta-steroid:NADP 3-oxidoreductase. Other names in common use include 3beta-hydroxysteroid 5beta-oxidoreductase, and 3beta-hydroxysteroid 5beta-progesterone oxidoreductase.