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ENZYME entry: EC

Accepted Name
cholestanetriol 26-monooxygenase.
Alternative Name(s)
5beta-cholestane-3alpha,7alpha,12alpha-triol 26-hydroxylase.
5beta-cholestane-3alpha,7alpha,12alpha-triol hydroxylase.
cholestanetriol 26-hydroxylase.
cholesterol 27-hydroxylase.
cytochrome P450 27A1'.
sterol 26-hydroxylase.
sterol 27-hydroxylase.
vitamin D3 25-hydroxylase.
Reaction catalysed
5beta-cholestane-3alpha,7alpha,12alpha-triol + 5 H(+) + 3 O2 + 6 reduced [adrenodoxin] <=> (25R)-3alpha,7alpha,12alpha-trihydroxy-5beta-cholestan-26-oate + 4 H2O + 6 oxidized [adrenodoxin]
  • Catalyzes the first three sterol side chain oxidations in bile acid biosynthesis via the neutral (classic) pathway.
  • Can also act on cholesterol, cholest-5-en-3beta,7alpha-diol, 7alpha- hydroxycholest-4-en-3-one, and 5beta-cholestane-3alpha,7alpha-diol.
  • The enzyme can also hydroxylate cholesterol at positions 24 and 25.
  • The initial source of the electrons is NADPH, which transfers the electrons to the adrenodoxin via EC
  • Formerly EC
PRIAM enzyme-specific profiles1.14.15.15
KEGG Ligand Database for Enzyme Nomenclature1.14.15.15
IUBMB Enzyme Nomenclature1.14.15.15
MEDLINEFind literature relating to
Rhea expert-curated reactions1.14.15.15
Q02318, CP27A_HUMAN;  Q9DBG1, CP27A_MOUSE;  P17177, CP27A_RABIT;  
P17178, CP27A_RAT;  C4B644, CPVDH_PSEAH;  

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