Cholestanetetraol 26-dehydrogenase
In enzymology, a cholestanetetraol 26-dehydrogenase (EC 1.1.1.161) is an enzyme that catalyzes the chemical reaction
- (25R)-5beta-cholestane-3alpha,7alpha,12alpha,26-tetraol + NAD+ (25R)-3alpha,7alpha,12alpha-trihydroxy-5beta-cholestan-26-al + NADH + H+
| cholestanetetraol 26-dehydrogenase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC number | 1.1.1.161 | ||||||||
| CAS number | 62213-60-9 | ||||||||
| 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 (25R)-5beta-cholestane-3alpha,7alpha,12alpha,26-tetraol and NAD+, whereas its 3 products are (25R)-3alpha,7alpha,12alpha-trihydroxy-5beta-cholestan-26-al, NADH, and H+.
This enzyme belongs to the family of oxidoreductases, specifically those acting on the CH-OH group of donor with NAD+ or NADP+ as acceptor. The systematic name of this enzyme class is (25R)-5beta-cholestane-3alpha,7alpha,12alpha,26-tetraol:NAD+ 26-oxidoreductase. Other names in common use include cholestanetetrol 26-dehydrogenase, 5beta-cholestane-3alpha,7alpha,12alpha,26-tetrol dehydrogenase, TEHC-NAD oxidoreductase, 5beta-cholestane-3alpha,7alpha,12alpha,26-tetraol:NAD+, and 26-oxidoreductase. This enzyme participates in bile acid biosynthesis.
References
- Masui T, Herman R, Staple E (1966). "The oxidation of 5-beta-cholestane-3-alpha, 7-alpha, 12-alpha, 26-tetraol to 5-beta-cholestane-3-alpha, 7-alpha, 12-alpha-triol-26-oic acid via 5-beta-cholestane-3-alpha, 7-alpha, 12-alpha-triol-26-al by rat liver". Biochim. Biophys. Acta. 117 (1): 266–8. doi:10.1016/0304-4165(66)90177-2. PMID 5914340.