IUBMB Enzyme Nomenclature


Accepted name: vitamin D 1,25-hydroxylase

Reaction: (1) calciol + O2 + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+ = calcidiol + 2 oxidized ferredoxin [iron-sulfur] cluster + H2O
(2) calcidiol + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+ + O2 = calcitriol + 2 oxidized ferredoxin [iron-sulfur] cluster + H2O

Glossary: calciol = cholecalciferol = vitamin D3 = (3S,5Z,7E)-9,10-seco-5,7,10(19)-cholestatriene-3-ol
calcidiol = 25-hydroxyvitamin D3 = (3S,5Z,7E)-9,10-seco-5,7,10(19)-cholestatriene-3,25-diol
calcitriol = 1α,25-dihydroxyvitamin D3 = (1S,3R,5Z,7E)-9,10-seco-5,7,10(19)-cholestatriene-1,3,25-triol

Other name(s): CYP105A1; Streptomyces griseolus cytochrome P450SU-1

Systematic name: calciol,ferredoxin:oxygen oxidoreductase (1,25-hydroxylating)

Comments: A P-450 (heme-thiolate) enzyme found in the bacterium Streptomyces griseolus. cf. EC, vitamin D 25-hydroxylase and EC, calcidiol 1-monooxygenase.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:


1. Sawada, N., Sakaki, T., Yoneda, S., Kusudo, T., Shinkyo, R., Ohta, M. and Inouye, K. Conversion of vitamin D3 to 1α,25-dihydroxyvitamin D3 by Streptomyces griseolus cytochrome P450SU-1. Biochem. Biophys. Res. Commun. 320 (2004) 156-164. [PMID: 15207715]

2. Sugimoto, H., Shinkyo, R., Hayashi, K., Yoneda, S., Yamada, M., Kamakura, M., Ikushiro, S., Shiro, Y. and Sakaki, T. Crystal structure of CYP105A1 (P450SU-1) in complex with 1α,25-dihydroxyvitamin D3. Biochemistry 47 (2008) 4017-4027. [PMID: 18314962]

[EC created 2016]

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