Reaction catalyzed by plant 4alpha-monomethylsterol monooxygenase (1.14.18.11)
+
2
+
+
2
=
+
2
+
H2O
4alpha-formylergosta-7,24(241)-dien-3beta-ol
+
2 ferrocytochrome b5
+
O2
+
2 H+
=
3beta-hydroxyergosta-7,24(241)-dien-4alpha-carboxylate
+
2 ferricytochrome b5
+
H2O
