GO:0000252

C-3 sterol dehydrogenase (C-4 sterol decarboxylase) activity

Details: 
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.
GO Category: 
MF
17beta-HSD1_like_SDR_c
Aldo_ket_red
NADB_Rossmann superfamily