Cholestenone 5alpha-reductase
In enzymology, a cholestenone 5alpha-reductase (EC 1.3.1.22) is an enzyme that catalyzes the chemical reaction
- 5alpha-cholestan-3-one + NADP+ cholest-4-en-3-one + NADPH + H+
| cholestenone 5-alpha-reductase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC number | 1.3.1.22 | ||||||||
| CAS number | 37255-34-8 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| Gene Ontology | AmiGO / QuickGO | ||||||||
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Thus, the two substrates of this enzyme are 5alpha-cholestan-3-one and NADP+, whereas its 3 products are cholest-4-en-3-one, NADPH, and H+.
This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-CH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is 3-oxo-5alpha-steroid:NADP+ Delta4-oxidoreductase. Other names in common use include testosterone Delta4-5alpha-reductase, steroid 5alpha-reductase, 3-oxosteroid Delta4-dehydrogenase, 5alpha-reductase, steroid 5alpha-hydrogenase, 3-oxosteroid 5alpha-reductase, testosterone Delta4-hydrogenase, 4-ene-3-oxosteroid 5alpha-reductase, reduced nicotinamide adenine dinucleotide, phosphate:Delta4-3-ketosteroid 5alpha-oxidoreductase, 4-ene-5alpha-reductase, Delta4-3-ketosteroid 5alpha-oxidoreductase, cholest-4-en-3-one 5alpha-reductase, and testosterone 5alpha-reductase.
References
- Shefer S, Hauser S, Mosbach EH (1966). "Studies on the biosynthesis of 5-alpha-cholestan-3-beta-ol. I Cholestenone 5-alpha-reductase of rat liver". J. Biol. Chem. 241 (4): 946–52. PMID 5907469.