Reaction catalyzed by 3alpha-hydroxysteroid 3-dehydrogenase (1.1.1.357)
+
NAD(P)+
=
+
NAD(P)H
+
cholic acid
+
NAD(P)+
=
(5beta,7alpha,8xi,12alpha)-7,12-dihydroxy-3-oxocholan-24-oic acid
+
NAD(P)H
+
H+
