CYP27B1 hydroxylates 25(OH)D to 1,25(OH)2D

Stable Identifier
Reaction [transition]
Homo sapiens
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The second step in vitamin D activation requires hydroxylation of 25-hydroxyvitamin D (calcidiol, 25(OH)D) to 1-alpha, 25-dihydroxyvitamin D (1,25(OH)2D). This conversion is mediated by 25-hydroxyvitamin D-1-alpha hydroxylase (CYP27B1), an outer mitochondrial membrane-resident protein (Zehnder et al. 2002, Fritsche et al. 2003, Sawada et al. 1999).

Literature References
PubMed ID Title Journal Year
12855575 Regulation of 25-hydroxyvitamin D3-1 alpha-hydroxylase and production of 1 alpha,25-dihydroxyvitamin D3 by human dendritic cells

Fritsche, J, Mondal, K, Ehrnsperger, A, Andreesen, R, Kreutz, M

Blood 2003
11856765 Synthesis of 1,25-dihydroxyvitamin D(3) by human endothelial cells is regulated by inflammatory cytokines: a novel autocrine determinant of vascular cell adhesion

Zehnder, D, Bland, R, Chana, RS, Wheeler, DC, Howie, AJ, Williams, MC, Stewart, PM, Hewison, M

J Am Soc Nephrol 2002
10518789 Enzymatic properties of human 25-hydroxyvitamin D3 1alpha-hydroxylase coexpression with adrenodoxin and NADPH-adrenodoxin reductase in Escherichia coli

Sawada, N, Sakaki, T, Kitanaka, S, Takeyama, K, Kato, S, Inouye, K

Eur. J. Biochem. 1999
Participant Of
Catalyst Activity
Catalyst Activity
calcidiol 1-monooxygenase activity of CYP27B1(?-508) [mitochondrial outer membrane]
Physical Entity
Orthologous Events
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