Reaction catalyzed by 3beta-hydroxy-5alpha-steroid dehydrogenase (1.1.1.278)
+
NADP+
=
+
NADPH
+
3beta-hydroxy-5alpha-pregnane-20-one
+
NADP+
=
5alpha-pregnan-3,20-dione
+
NADPH
+
H+
