Progesterone Reductase

**Definition:** An enzyme that catalyzes the reduction of a 3 beta-hydroxy-delta(5)-steroid to 3-oxo-delta(4)-steroid in the presence of NAD. It converts pregnenolone to progesterone and dehydroepiandrosterone to androstenedione. EC 1.1.1.145.

**Tree numbers:** - D08.811.682.047.436.350.700 - D08.811.682.047.820.500

**Synonyms:** - 5-Ene-3 beta-hydroxysteroid Dehydrogenase - 3 beta-Hydroxy-delta-5-Steroid Dehydrogenase - Steroid delta(5)-3 beta-ol Dehydrogenase