Cholestanetetraol 26-dehydrogenase

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.

Oxidoreductases: alcohol oxidoreductases (EC 1.1)

1.1.1: NAD/NADP acceptor	3-hydroxyacyl-CoA dehydrogenase 3-hydroxybutyryl-CoA dehydrogenase Alcohol dehydrogenase Aldo-keto reductase 1A1 1B1 1B10 1C1 1C3 1C4 7A2 Aldose reductase Beta-Ketoacyl ACP reductase Carbohydrate dehydrogenases Carnitine dehydrogenase D-malate dehydrogenase (decarboxylating) DXP reductoisomerase Glucose-6-phosphate dehydrogenase Glycerol-3-phosphate dehydrogenase HMG-CoA reductase IMP dehydrogenase Isocitrate dehydrogenase Lactate dehydrogenase L-threonine dehydrogenase L-xylulose reductase Malate dehydrogenase Malate dehydrogenase (decarboxylating) Malate dehydrogenase (NADP+) Malate dehydrogenase (oxaloacetate-decarboxylating) Malate dehydrogenase (oxaloacetate-decarboxylating) (NADP+) Phosphogluconate dehydrogenase Sorbitol dehydrogenase Hydroxysteroid dehydrogenase: 3 Beta 3-beta-HSD NSDHL 11 Beta HSD11B1 HSD11B2 17 Beta

1.1.2: cytochrome acceptor	D-lactate dehydrogenase (cytochrome) D-lactate dehydrogenase (cytochrome c-553) Mannitol dehydrogenase (cytochrome)

1.1.3: oxygen acceptor	Glucose oxidase L-gulonolactone oxidase Xanthine oxidase

1.1.4: disulfide as acceptor	Vitamin K epoxide reductase Vitamin-K-epoxide reductase (warfarin-insensitive)

1.1.5: quinone/similar acceptor	Malate dehydrogenase (quinone) Quinoprotein glucose dehydrogenase

1.1.99: other acceptors	Choline dehydrogenase L2HGDH

Enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list)

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