3-beta-hydroxysteroid dehydrogenase [NAD(P)+]/C4-decarboxylase activity obsolete 4alpha-carboxy-4beta-methyl-5alpha-cholesta-8-en-3beta-ol:NAD(P)+ 3-oxidoreductase (decarboxylating) activity https://github.com/geneontology/go-ontology/issues/28070 true GO:0103066 This term was obsoleted because it represents a specific substrate of C-3 sterol dehydrogenase (C-4 sterol decarboxylase) activity ; GO:0000252. molecular_function OBSOLETE. Catalysis of the reaction: 4alpha-carboxy-4beta-methyl-5alpha-cholesta-8-en-3beta-ol + NAD(P) = 4alpha-methyl-5alpha-cholesta-8-en-3-one + carbon dioxide + NAD(P)H.