CATH Classification
Level | CATH Code | Description |
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3 | Alpha Beta |
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3.40 | 3-Layer(aba) Sandwich |
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3.40.50 | Rossmann fold |
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3.40.50.970 | Thiamin diphosphate (ThDP)-binding fold, Pyr/PP domains |
Domain Context
CATH Clusters
Superfamily | 3.40.50.970 |
Functional Family | Pyruvate dehydrogenase E1 beta subunit |
Enzyme Information
1.2.4.4 |
3-methyl-2-oxobutanoate dehydrogenase (2-methylpropanoyl-transferring).
based on mapping to UniProt P21953
3-methyl-2-oxobutanoate + [dihydrolipoyllysine-residue (2-methylpropanoyl)transferase] lipoyllysine = [dihydrolipoyllysine- residue (2-methylpropanoyl)transferase] S-(2-methylpropanoyl)dihydrolipoyllysine + CO(2).
-!- 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, which also binds multiple copies of EC 1.8.1.4. -!- It does not act on free lipoamide or lipoyllysine, but only on the lipoyllysine residue in EC 2.3.1.168. -!- Formerly EC 1.2.4.3.
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UniProtKB Entries (1)
P12694 |
ODBA_HUMAN
Homo sapiens
2-oxoisovalerate dehydrogenase subunit alpha, mitochondrial
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PDB Structure
PDB | 1DTW |
External Links | |
Method | X-RAY DIFFRACTION |
Organism | Escherichia |
Primary Citation |
Crystal structure of human branched-chain alpha-ketoacid dehydrogenase and the molecular basis of multienzyme complex deficiency in maple syrup urine disease.
Structure Fold.Des.
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