25-Hydroxyvitamin D3 1-alpha-hydroxylase (VD3 1A hydroxylase) also known as cytochrome p450 27B1 (CYP27B1) is a cytochrome P450 enzyme that in humans is encoded by the CYP27B1 gene.[1][2][3]
VD3 1A hydroxylase is located in the proximal tubule of the kidney and a variety of other tissues, including skin (keratinocytes), immune cells,[4] and bone (osteoblasts).[5] The enzyme catalyzes the hydroxylation of calcidiol to calcitriol (the bioactive form of Vitamin D):[6]
calcitriol + NADP+ + H2O
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Click on genes, proteins and metabolites below to link to respective articles. [7]
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