| methylcrotonoyl-CoA carboxylase | 
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| Identifiers | 
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| Aliases | methylcrotonyl-CoA carboxylase3-methylcrotonoyl-CoA:carbon-dioxide ligase (ADP-forming)beta-methylcrotonyl coenzyme A carboxylaseMCCCmethylcrotonyl coenzyme A carboxylasebeta-methylcrotonyl CoA carboxylasebeta-methylcrotonyl-CoA carboxylase | 
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| External IDs | GeneCards: ; OMA:- orthologs | 
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| Wikidata | 
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Methylcrotonyl CoA carboxylase (EC 6.4.1.4, MCC) (3-methylcrotonyl CoA carboxylase, methylcrotonoyl-CoA carboxylase) is a biotin-requiring enzyme located in the mitochondria. MCC uses bicarbonate as a carboxyl group source to catalyze the carboxylation of a carbon adjacent to a carbonyl group performing the fourth step in processing leucine, an essential amino acid.