产品内容
本酶催化的反应为(1) Cholest-5-Ene-3beta,25-Diol + [Reduced NADPH---Hemoprotein Reductase] + O2 = Cholest-5-Ene-3beta,7alpha,25-Triol + [Oxidized NADPH---Hemoprotein Reductase] + H2O;;(2) (25R)-Cholest-5-Ene-3beta,26-Diol + [Reduced NADPH---Hemoprotein Reductase] + O2 = (25R)-Cholest-5-Ene-3beta,7alpha,26-Triol + [Oxidized NADPH---Hemoprotein Reductase] + H2O,系统名称为Cholest-5-Ene-3beta,25/26-Diol,[NADPH---Hemoprotein Reductase]:oxygen Oxidoreductase (7alpha-Hydroxylating),一种P-450(血红素-硫醇盐)蛋白。与对其氧甾醇底物专一的 EC 1.14.14.26,24-羟基胆固醇7α-单加氧酶不同,该酶还能代谢氧甾醇24,25-环氧胆固醇、22-羟基胆固醇和24-羟基胆固醇,但程度较低 [2]。该酶的直接电子供体是 EC 1.6.2.4,NADPH---血红蛋白还原酶。