CYP2R1
Mammalian protein found in Homo sapiens / From Wikipedia, the free encyclopedia
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CYP2R1 is cytochrome P450 2R1, an enzyme which is the principal vitamin D 25-hydroxylase.[5][6] In humans it is encoded by the CYP2R1 gene located on chromosome 11p15.2.[7] It is expressed in the endoplasmic reticulum in liver, where it performs the first step in the activation of vitamin D by catalyzing the formation of 25-hydroxyvitamin D.[8]
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Vitamin D 25-hydroxylase activity is also possessed by some other cytochrome P450 enzymes, in particular CYP27A1, which is found in mitochondria.[8][9]