Reaction catalyzed by 3alpha-hydroxysteroid 3-dehydrogenase (Si-specific) (1.1.1.50), 3alpha-hydroxysteroid 3-dehydrogenase (Re-specific) (1.1.1.213)
+
NADH
+
=
+
NAD+
4-androsten-3alpha-ol-17-one
+
NADH
+
H+
=
4-androsten-3alpha,17beta-diol
+
NAD+
