Reaction catalyzed by 3beta-hydroxysteroid-4alpha-carboxylate 3-dehydrogenase (decarboxylating) (1.1.1.170)
+
NAD+
=
+
+
NADH
3beta-hydroxy-4alpha-methyl-5alpha-cholest-7-ene-4beta-carboxylate
+
NAD+
=
4alpha-methyl-5alpha-cholest-7-en-3-one
+
CO2
+
NADH
