細胞色素P450家族51,CYP51也稱為甾醇-14-去甲基酶(英語:sterol 14-demethylase,EC 1.14.13.70)是催化一系列14α-甲基甾醇去甲基化的酶。多種C29、C30甾醇底物可被CYP51家族的酶去甲基化[1],如CYP51F1主要催化:
而CYP51A1在人體內催化2,3-環氧鯊烯環化為羊毛甾醇後的第一步反應:
- 羊毛甾醇 + 3 O2 + 3 NADPH + 3 H+ 4,4-二甲基-5α-膽甾-8(9),14,24-三烯-3β-ol + 甲酸 + 3 NADP+ + 4 H2O
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