5β-Reductase
CLASS OF ENZYMES
EC 1.3.1.3; Cortisone b-reductase; 5β-reductase; 5beta-cholestan-3-one:NADP+ 4,5-oxidoreductase; 5beta-Reductase; 5-beta-reductase; AKR1D1; 5β-reduction; 5β-Reduction; Δ4-3-oxosteroid-5β-reductase
5β-Reductase, or Δ4-3-oxosteroid 5β-reductase (, 3-oxo-Δ4-steroid 5β-reductase, androstenedione 5β-reductase, cholestenone 5β-reductase, cortisone 5β-reductase, cortisone Δ4-5β-reductase, steroid 5β-reductase, testosterone 5β-reductase, Δ4-3-ketosteroid 5β-reductase, Δ4-5β-reductase, Δ4-hydrogenase, 4,5β-dihydrocortisone:NADP+ Δ4-oxidoreductase, 3-oxo-5β-steroid:NADP+ Δ4-oxidoreductase) is an enzyme with systematic name 5β-cholestan-3-one:NADP+ 4,5-oxidoreductase. This enzyme catalyses the following chemical reaction