NADPH-dependent oxidoreductase which catalyzes the reduction of a variety of compounds bearing carbonyl groups including ketosteroids, alpha-dicarbonyl compounds, aldehydes, aromatic ketones and quinones. Reduces 3-ketosteroids and benzil into 3beta-hydroxysteroids and R-benzoin, respectively, in contrast to the stereoselectivity of non-primate DHRS4s which produce 3alpha-hydroxysteroids and S-benzoin. Diplays low activity toward all-trans-retinal and no activity toward 9-cis-retinal as compared to non-primate mammals. In the reverse reaction, catalyze the NAD-dependent oxidation of 3beta-hydroxysteroids and alcohol, but with much lower efficiency. Involved in the metabolism of 3beta-hydroxysteroids, isatin and xenobiotic carbonyl compounds.
Subcellular locations: Peroxisome