Market25-Hydroxyvitamin D 1-alpha-hydroxylase
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25-Hydroxyvitamin D 1-alpha-hydroxylase

25-Hydroxyvitamin D 1-alpha-hydroxylase also known as calcidiol 1-monooxygenase or cytochrome p450 27B1 (CYP27B1) or simply 1-alpha-hydroxylase is a cytochrome P450 enzyme that in humans is encoded by the CYP27B1 gene.

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The enzyme catalyzes the hydroxylation of calcifediol to calcitriol (the bioactive form of Vitamin D): :calcidiol + 2 reduced adrenodoxin + 2 H+ + O2 calcitriol + 2 oxidized adrenodoxin + H2O The enzyme is also able to oxidize ercalcidiol (25-OH D2) to ercalcitriol, secalciferol to calcitetrol, and 25-hydroxy-24-oxocalciol to (1S)-1,25-dihydroxy-24-oxocalciol. Image:Calcidiol2.svg|Calcidiol Image:Calcitriol.svg |Calcitriol == Clinical significance ==
Clinical significance
Loss-of-function mutations in CYP27B1 cause Vitamin D-dependent rickets, type IA. ==Interactive pathway map==
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