label: C-3 sterol dehydrogenase (C-4 sterol decarboxylase) activity
label_lc: c-3 sterol dehydrogenase (c-4 sterol decarboxylase) activity
description: "Catalysis of the reaction: 3-beta-hydroxy-4-beta-methyl-5-alpha-cholesta-8,24-dien-4-alpha-carboxylate + NAD(P)+ = 4-alpha-methyl-5-alpha-cholesta-8,24-dien-3-one + CO2 + NAD(P)H."