Desc: |
Catalysis of the reaction: 4alpha-methyl-delta7-sterol + 3NADPH + 3H+ + 3O2 = 4alpha-carboxy, delta7-sterol + 3NADP+ + 3H2O. This overall reaction proceeds through a series of three successive monooxygenations of the alpha methyl group on the C4 carbon (CH3 to CH2OH to CHO to COOH). |