Reaction catalyzed by 3-oxocholoyl-CoA 4-desaturase (1.3.1.115)
+
NAD+
=
+
NADH
+
7alpha-hydroxy-3-oxochol-24-oyl-CoA
+
NAD+
=
7alpha-hydroxy-3-oxochol-4-en-24-oyl-CoA
+
NADH
+
H+
