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25-Hydroxyvitamin D3 1-alpha-hydroxylase
25-Hydroxyvitamin D3 1-alpha-hydroxylase (VD3 1A hydroxylase) also known as cytochrome p450 27B1 (CYP27B1) or simply 1-alpha-hydroxylase is a cytochrome P450 enzyme that in humans is encoded by the ''CYP27B1'' gene.〔(【引用サイトリンク】 url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=1594 )〕 VD3 1A hydroxylase is located in the proximal tubule of the kidney and a variety of other tissues, including skin (keratinocytes), immune cells, and bone (osteoblasts). The enzyme catalyzes the hydroxylation of Calcifediol to calcitriol (the bioactive form of Vitamin D): :calcidiol + NADPH + H+ + O2 calcitriol + NADP+ + H2O
Image:Calcidiol2.svg|Calcidiol Image:Calcitriol.svg |Calcitriol
==Interactive pathway map==
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