5.4.99.64 2-hydroxyisobutyryl-CoA mutase, HCM, HcmA, hcmAB, HcmB, RcmA, RcmB - 5.4.99.64 EC 5.3.3.20 formerly 5.4.99.64 Btus_0469 gene name, subunit RcmA 5.4.99.64 Btus_0470 gene name, subunit RcmB