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Information on EC 1.2.4.4 - 3-methyl-2-oxobutanoate dehydrogenase (2-methylpropanoyl-transferring)

for references in articles please use BRENDA:EC1.2.4.4

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IUBMB Comments

Contains thiamine diphosphate. It acts not only on 3-methyl-2-oxobutanaoate, but also on 4-methyl-2-oxopentanoate and (S)-3-methyl-2-oxopentanoate, so that it acts on the 2-oxo acids that derive from the action of transaminases on valine, leucine and isoleucine. It is a component of the multienzyme 3-methyl-2-oxobutanoate dehydrogenase complex in which multiple copies of it are bound to a core of molecules of EC 2.3.1.168, dihydrolipoyllysine-residue (2-methylpropanoyl)transferase, which also binds multiple copies of EC 1.8.1.4, dihydrolipoyl dehydrogenase. It does not act on free lipoamide or lipoyllysine, but only on the lipoyllysine residue in EC 2.3.1.168.

The expected taxonomic range for this enzyme is: Bacteria, Eukaryota, Archaea

Synonyms
bckdh, bckdhb, bckdha, branched-chain 2-oxo acid dehydrogenase, branched-chain alpha-keto acid dehydrogenase, alpha-ketoacid dehydrogenase, branched-chain alpha-ketoacid dehydrogenase, bckdc, branched-chain alpha-ketoacid dehydrogenase complex, bcka dehydrogenase, more

REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
3-methyl-2-oxobutanoate + [dihydrolipoyllysine-residue (2-methylpropanoyl)transferase] lipoyllysine = [dihydrolipoyllysine-residue (2-methylpropanoyl)transferase] S-(2-methylpropanoyl)dihydrolipoyllysine + CO2 + 2 H+
show the reaction diagram
PATHWAY SOURCE
PATHWAYS
MetaCyc
2-oxoisovalerate decarboxylation to isobutanoyl-CoA