2-hydroxyisobutanoyl-CoA mutase large subunit

UniProtKB accession:  I3VE77

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UniProtKB description:  Together with HcmB, catalyzes the isomerization of 2-hydroxyisobutyryl-CoA and 3-hydroxybutyryl-CoA. Is specific for 2-hydroxyisobutyryl-CoA and (S)-3-hydroxybutyryl-CoA, and shows only very low activity with (R)-3-hydroxybutyryl-CoA, isobutyryl-CoA and butyryl-CoA (PubMed:22433853, PubMed:25720495). In vitro, can isomerize pivalyl-CoA and isovaleryl-CoA, with much lower efficiency (PubMed:25720495). Plays a central role in the degradation of substrates bearing a tert-butyl moiety, such as the fuel oxygenate methyl tert-butyl ether (MTBE) and its metabolites (PubMed:22433853).