3 Beta-Hydroxysteroid Dehydrogenase/Delta 5->4-Isomerase Type 1

**Semantic type:** Amino Acid, Peptide, or Protein|Enzyme

**Definition:** 3 beta-hydroxysteroid dehydrogenase/Delta 5->4-isomerase type 1 (373 aa, ~42 kDa) is encoded by the human HSD3B1 gene. This protein plays a role in both the biosynthesis of hormonal steroids and the oxidative conversion of ketosteroids.

**Synonyms:** - 3 Beta-Hydroxysteroid Dehydrogenase/Delta 5-->4-Isomerase Type 1 - 3 Beta-Hydroxysteroid Dehydrogenase/Delta 5-->4-Isomerase Type I - 3 Beta-Hydroxysteroid Dehydrogenase/Delta 5->4-Isomerase Type I - 3 Beta-Hydroxysteroid Dehydrogenase/Delta 5->4-Isomerase Type 1 - 3 Beta-Hydroxysteroid Dehydrogenase/Delta 5->4-Isomerase Type I - 3-Beta-HSD I - 3-Beta-Hydroxy-5-Ene Steroid Dehydrogenase - 3-Beta-Hydroxy-Delta(5)-Steroid Dehydrogenase - 3-Beta-Hydroxysteroid 3-Dehydrogenase - Delta-5-3-Ketosteroid Isomerase - EC 1.1.1.145 - EC 5.3.3.1 - HSD3B1 - Hydroxy-Delta-5-Steroid Dehydrogenase, 3 Beta-and Steroid Delta-Isomerase 1 - Progesterone Reductase - Short Chain Dehydrogenase/Reductase Family 11E - Short Chain Dehydrogenase/Reductase Family 11E, Member 1 - Steroid Delta-Isomerase - Trophoblast Antigen FDO161G