This term is obsolete.
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Definition:
OBSOLETE. A protein complex that catalyzes the reaction 3-methyl-2-oxobutanoate + lipoamide = S-(2-methylpropanoyl)-dihydrolipoamide + carbon dioxide (CO2). This requires thiamine diphosphate; the enzyme also acts on (S)-3-methyl-2-oxopentanoate and 4-methyl-2-oxo-pentanoate.
Comment:
The reason for obsoletion is that this term is equivalent to GO:0160157 branched-chain alpha-ketoacid dehydrogenase complex.