obsolete 3-methylcrotonyl-CoA carboxylase complex, mitochondrial https://github.com/geneontology/go-ontology/issues/28023 true hjd 2010-03-15T04:58:08Z cellular_component mitochondrial methylcrotonoyl-CoA carboxylase complex GO:0002169 OBSOLETE. A mitochondrial protein complex which is capable of 3-methylcrotonyl-CoA carboxylase activity. In mammals, at least, consists as a dodecamer of 6 alpha and 6 beta subunits. MCCC-alpha has a covalently bound biotin essential for the ATP-dependent carboxylation. MCCC-beta possesses carboxyltransferase activity which presumably is essential for binding to 3-methylcrotonyl-CoA. The reason for obsoletion is that this term is equivalent to GO:1905202 methylcrotonoyl-CoA carboxylase complex. mitochondrial 3-methylcrotonyl-CoA carboxylase holoenzyme mitochondrial MCCC complex methylcrotonoyl-CoA carboxylase complex