METHYLCROTONYL-COA CARBOXYLASE ALPHA CHAIN, MITOCHONDRIAL PRECURSOR (EC 6.4.1.4) (3-METHYLCROTONYL-COA CARBOXYLASE 1) (MCCASE ALPHA SUBUNIT) (3-METHYLCROTONYL-COA:CARBON DIOXIDE LIGASE ALPHA SUBUNIT). [Source:SWISSPROT;Acc:Q96RQ3]