3-beta-hydroxy-5-beta-steroid dehydrogenase (NADP+) activity
3-beta-hydroxy-5-beta-steroid dehydrogenase (nadp+) activity
Catalysis of the reaction: 3-beta-hydroxy-5-beta-pregnane-20-one + NADP+ = 5-beta-pregnan-3,20-dione + H+ + NADPH.