This enzyme belongs to the family of isomerases, specifically those intramolecular transferases transferring other groups. The systematic name of this enzyme class is 2-methylpropanoyl-CoA CoA-carbonylmutase. Other names in common use include isobutyryl coenzyme A mutase, and butyryl-CoA:isobutyryl-CoA mutase. It has 2 cofactors: cobalt, and Cobamide coenzyme.
Willenbrock F and Robinson JA (1988). "The enzymic interconversion of isobutyryl and N-butyrylcarba(dethia)-coenzyme-A - a coenzyme-B12-dependent carbon skeleton rearrangement". Angew. Chem. Int. Ed. Engl.27 (8): 1089–1091. doi:10.1002/anie.198810891.