3-beta-HSD I, 3BETAHSD, 3BH, 3BHSD, HSD3B, HSD3B1, HSDB3, HSDB3A, SDR11E1.
A bifunctional enzyme responsible for the oxidation and isomerization of 3beta-hydroxy-Delta5-steroid precursors to 3-oxo-Delta4-steroids, an essential step in steroid hormone biosynthesis.