ID 1.3.99.5 DE 3-oxo-5alpha-steroid 4-dehydrogenase (acceptor). AN steroid 5alpha-reductase. CA A + a 3-oxo-5alpha-steroid = a 3-oxo-Delta(4)-steroid + AH2. CC -!- This bacterial enzyme, characterized from Comamonas testosteroni, CC is involved in androsterone degradation. cf. EC 1.3.1.22. DR Q59327, OASD_COMTE ; //