Reaction catalyzed by 4alpha-methylsterol monooxygenase (1.14.18.9)
+
6
+
3
+
6
=
+
6
+
4
H2O
4,4-dimethyl-5alpha-cholest-7-en-3beta-ol
+
6 ferrocytochrome b5
+
3 O2
+
6 H+
=
3beta-hydroxy-4beta-methyl-5alpha-cholest-7-ene-4alpha-carboxylate
+
6 ferricytochrome b5
+
4 H2O
