Source:http://linkedlifedata.com/resource/umls/id/C1151041
GO: 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. [EC:1.1.1.170, PMID:9811880]