SRD5A1 is involved in bile acid biosynthesis, androgen and estrogen metabolism which catalyzes the conversion of testosterone into the more potent androgen.
3-oxo-5-steroid 4-dehydrogenase 1 is an enzyme that in humans is encoded by the SRD5A1 gene. The 3-oxo-5-steroid 4-dehydrogenase 1 enzyme is involved in bile acid biosynthesis, androgen and estrogen metabolism. For instance, the enzyme catalyzes the conversion of testosterone into the more potent androgen, 5-dihydrotestosterone. 
