Reaction catalyzed by steroid 17alpha-monooxygenase (1.14.14.19)
+
NADPH
+
=
+
NADP+
+
H2O
5alpha-pregnan-3,20-dione
+
NADPH
+
O2
=
5alpha-pregnan-17alpha-ol-3,20-dione
+
NADP+
+
H2O
