Reaction catalyzed by 4alpha-methylsterol monooxygenase (1.14.18.9)
+
2
+
+
2
=
+
2
+
H2O
4,4-dimethyl-5alpha-cholest-7-en-3beta-ol
+
2 ferrocytochrome b5
+
O2
+
2 H+
=
4beta-hydroxymethyl-4alpha-methyl-5alpha-cholest-7-en-3beta-ol
+
2 ferricytochrome b5
+
H2O
