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| Definition | 4alpha-Methylzymosterol-4-carboxylate + NADP+ <=> 3-Keto-4-methylzymosterol + NADPH + H+ + CO2
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| Enzyme |  | 
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| Pathway | | rn01110 | Biosynthesis of secondary metabolites | 
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| Module | | M00101 | Cholesterol biosynthesis, FPP => cholesterol | 
 | M00102 | Ergocalciferol biosynthesis, FPP => ergosterol/ergocalciferol | 
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| Brite | Enzymatic reactions [BR:br08201]1. Oxidoreductase reactions
 1.1  Acting on the CH-OH group of donors
 1.1.1  With NAD+ or NADP+ as acceptor
 1.1.1.170
 R07494  4alpha-Methylzymosterol-4-carboxylate + NADP+ <=> 3-Keto-4-methylzymosterol + NADPH + H+ + CO2
 IUBMB reaction hierarchy [BR:br08202]
 1. Oxidoreductase reactions
 1.1.1.170
 R12406  3beta-Hydroxysteroid-4alpha-carboxylate <=> 3-Oxosteroid
 R07494  4alpha-Methylzymosterol-4-carboxylate <=> 3-Keto-4-methylzymosterol
 
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| Orthology | | K07748 | sterol-4alpha-carboxylate 3-dehydrogenase (decarboxylating) [EC:1.1.1.170] | 
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