1.2.4.4	3-methyl-2-oxobutanoate dehydrogenase (2-methylpropanoyl-transferring)	2-oxoisovalerate decarboxylation to isobutanoyl-CoA	
1.8.1.4	dihydrolipoyl dehydrogenase	2-oxoisovalerate decarboxylation to isobutanoyl-CoA	
2.3.1.168	dihydrolipoyllysine-residue (2-methylpropanoyl)transferase	2-oxoisovalerate decarboxylation to isobutanoyl-CoA