Reaction catalyzed by 3beta-hydroxysteroid-4alpha-carboxylate 3-dehydrogenase (decarboxylating) (1.1.1.170)
+
NADP+
=
+
+
NADPH
4alpha-carboxy-5alpha-cholesta-8-en-3beta-ol
+
NADP+
=
5alpha-cholesta-8-en-3-one
+
CO2
+
NADPH
