Annotations: 1DTW

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1dtwa_	Alpha and beta proteins (a/b)	Thiamin diphosphate-binding fold (THDP-binding)	Thiamin diphosphate-binding fold (THDP-binding)	Branched-chain alpha-keto acid dehydrogenase PP module	Branched-chain alpha-keto acid dehydrogenase, PP module	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d1dtwb1	Alpha and beta proteins (a/b)	Thiamin diphosphate-binding fold (THDP-binding)	Thiamin diphosphate-binding fold (THDP-binding)	Branched-chain alpha-keto acid dehydrogenase Pyr module	Branched-chain alpha-keto acid dehydrogenase, Pyr module	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d1dtwb2	Alpha and beta proteins (a/b)	TK C-terminal domain-like	TK C-terminal domain-like	Branched-chain alpha-keto acid dehydrogenase beta-subunit, C-terminal-domain	Branched-chain alpha-keto acid dehydrogenase	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Thiamin diphosphate-binding fold (THDP-binding)	8032827	3001790	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	TK C-terminal domain-like	8037948	3000424	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Thiamin diphosphate-binding fold (THDP-binding)	8037947	3001790	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	E1_dh	e1dtwA1	A: a/b three-layered sandwiches	X: Thiamin diphosphate-binding fold (THDP-binding) (From Topology)	H: Thiamin diphosphate-binding fold (THDP-binding) (From Topology)	T: Thiamin diphosphate-binding fold (THDP-binding)	F: E1_dh	ECOD (1.6)
B	Transketolase_C	e1dtwB1	A: a/b three-layered sandwiches	X: TK C-terminal domain-like (From Topology)	H: TK C-terminal domain-like (From Topology)	T: TK C-terminal domain-like	F: Transketolase_C	ECOD (1.6)
B	Transket_pyr	e1dtwB2	A: a/b three-layered sandwiches	X: Thiamin diphosphate-binding fold (THDP-binding) (From Topology)	H: Thiamin diphosphate-binding fold (THDP-binding) (From Topology)	T: Thiamin diphosphate-binding fold (THDP-binding)	F: Transket_pyr	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.970	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Thiamin diphosphate (ThDP)-binding fold, Pyr/PP domains	CATH (4.3.0)
B	3.40.50.920	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold		CATH (4.3.0)
B	3.40.50.970	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Thiamin diphosphate (ThDP)-binding fold, Pyr/PP domains	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00676	Dehydrogenase E1 component (E1_dh)	Dehydrogenase E1 component	-	Family
B	PF02779	Transketolase, pyrimidine binding domain (Transket_pyr)	Transketolase, pyrimidine binding domain	This family includes transketolase enzymes, pyruvate dehydrogenases, and branched chain alpha-keto acid decarboxylases.	Domain
B	PF02780	Transketolase, C-terminal domain (Transketolase_C)	Transketolase, C-terminal domain	The C-terminal domain of transketolase has been proposed as a regulatory molecule binding site [2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	BRANCHED-CHAIN ALPHA-KETO ACID DEHYDROGENASE ALPHA SUBUNIT	oxidoreductase activity, acting on the aldehyde or oxo group of donors, disulfide as acceptor oxidoreductase activity oxidoreductase activity, acting on the aldehyde or oxo group of donors 3-methyl-2-oxobutanoate dehydrogenase (2-methylpropanoyl-transferring) activity catalytic activity cation binding ion binding binding metal ion binding small molecule binding carboxy-lyase activity lyase activity carbon-carbon lyase activity	catabolic process oxoacid metabolic process cellular metabolic process carboxylic acid metabolic process amino acid metabolic process primary metabolic process organic acid catabolic process organic acid metabolic process branched-chain amino acid catabolic process cellular catabolic process carboxylic acid catabolic process small molecule metabolic process metabolic process cellular process catabolic process oxoacid metabolic process cellular metabolic process carboxylic acid metabolic process amino acid metabolic process primary metabolic process organic acid catabolic process organic acid metabolic process branched-chain amino acid catabolic process cellular catabolic process carboxylic acid catabolic process small molecule metabolic process metabolic process cellular process branched-chain amino acid metabolic process small molecule catabolic process amino acid catabolic process	protein-containing complex catalytic complex branched-chain alpha-ketoacid dehydrogenase complex oxidoreductase complex alpha-ketoacid dehydrogenase complex membrane-bounded organelle intracellular organelle intracellular anatomical structure mitochondrion organelle cytoplasm cellular anatomical entity intracellular membrane-bounded organelle oxoglutarate dehydrogenase complex protein-containing complex catalytic complex branched-chain alpha-ketoacid dehydrogenase complex oxidoreductase complex alpha-ketoacid dehydrogenase complex membrane-bounded organelle intracellular organelle intracellular anatomical structure mitochondrion organelle cytoplasm cellular anatomical entity intracellular membrane-bounded organelle oxoglutarate dehydrogenase complex tricarboxylic acid cycle heteromeric enzyme complex membrane-enclosed lumen mitochondrial matrix intracellular organelle lumen organelle lumen
B	BRANCHED-CHAIN ALPHA-KETO ACID DEHYDROGENASE BETA SUBUNIT	oxidoreductase activity, acting on the aldehyde or oxo group of donors, disulfide as acceptor oxidoreductase activity oxidoreductase activity, acting on the aldehyde or oxo group of donors 3-methyl-2-oxobutanoate dehydrogenase (2-methylpropanoyl-transferring) activity catalytic activity protein-containing complex binding binding	catabolic process oxoacid metabolic process cellular metabolic process carboxylic acid metabolic process amino acid metabolic process primary metabolic process organic acid catabolic process organic acid metabolic process branched-chain amino acid catabolic process cellular catabolic process carboxylic acid catabolic process small molecule metabolic process metabolic process cellular process catabolic process oxoacid metabolic process cellular metabolic process carboxylic acid metabolic process amino acid metabolic process primary metabolic process organic acid catabolic process organic acid metabolic process branched-chain amino acid catabolic process cellular catabolic process carboxylic acid catabolic process small molecule metabolic process metabolic process cellular process branched-chain amino acid metabolic process small molecule catabolic process amino acid catabolic process response to stimulus response to chemical response to organophosphorus response to oxygen-containing compound response to nitrogen compound response to purine-containing compound response to cAMP response to organic cyclic compound response to nutrient levels response to nutrient lipid metabolic process response to corticosteroid response to lipid response to hormone response to steroid hormone response to endogenous stimulus response to glucocorticoid	protein-containing complex catalytic complex branched-chain alpha-ketoacid dehydrogenase complex oxidoreductase complex alpha-ketoacid dehydrogenase complex membrane-bounded organelle intracellular organelle intracellular anatomical structure mitochondrion organelle cytoplasm cellular anatomical entity intracellular membrane-bounded organelle nucleus protein-containing complex catalytic complex branched-chain alpha-ketoacid dehydrogenase complex oxidoreductase complex alpha-ketoacid dehydrogenase complex membrane-bounded organelle intracellular organelle intracellular anatomical structure mitochondrion organelle cytoplasm cellular anatomical entity intracellular membrane-bounded organelle nucleus membrane-enclosed lumen nucleolus intracellular organelle lumen organelle lumen intracellular non-membrane-bounded organelle nuclear lumen non-membrane-bounded organelle nucleoplasm oxoglutarate dehydrogenase complex tricarboxylic acid cycle heteromeric enzyme complex mitochondrial matrix

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR029061	Thiamin diphosphate-binding fold	Homologous Superfamily
A	IPR050771	Alpha-ketoacid dehydrogenase complex E1 component	Family
A	IPR001017	Dehydrogenase, E1 component	Domain
B	IPR029061	Thiamin diphosphate-binding fold	Homologous Superfamily
B	IPR009014	Transketolase C-terminal/Pyruvate-ferredoxin oxidoreductase domain II	Homologous Superfamily
B	IPR005475	Transketolase-like, pyrimidine-binding domain	Domain
B	IPR033248	Transketolase, C-terminal domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: P12694	maple syrup urine disease classic maple syrup urine disease heart disease inherited organic acidemia intermittent maple syrup urine disease Maple syrup urine disease, type 1B myocardial infarction colorectal cancer intellectual disability osteoarthritis inborn errors of metabolism intermediate maple syrup urine disease prostate carcinoma
B	Pharos: P21953	maple syrup urine disease Maple syrup urine disease, type 1B medulloblastoma psoriasis atopic eczema idiopathic scoliosis intellectual disability interstitial cystitis lung carcinoma osteosarcoma tuberculosis atypical teratoid rhabdoid tumor glioblastoma inborn errors of metabolism intermediate maple syrup urine disease maple syrup urine disease Maple syrup urine disease, type 1B medulloblastoma psoriasis atopic eczema idiopathic scoliosis intellectual disability interstitial cystitis lung carcinoma osteosarcoma tuberculosis atypical teratoid rhabdoid tumor glioblastoma inborn errors of metabolism intermediate maple syrup urine disease large cell medulloblastoma malignant ependymoma pancreatic ductal adenocarcinoma classic maple syrup urine disease inherited organic acidemia intermittent maple syrup urine disease lung cancer malignant mesothelioma

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A, B	3-methyl-2-oxobutanoate dehydrogenase (2-methylpropanoyl-transferring) M-CSA #280	The branched-chain alpha-keto dehydrogenase complex catalyzes the overall conversion of alpha-keto acids to acyl-CoA and CO2. It is a multienzyme complex composed of 3 functional components: (E1) branched-chain alpha-keto acid decarboxylase or 2-oxoisovalerate dehydrogenase; (E2) lipoamide acyltransferase; (E3) lipoamide dehydrogenase. This entry represents E2, the lipoamide acyltransferase function, which is a thiamine diphposphate dependent reaction.	Defined by 4 residues: SER:A-162HIS:A-291SER:A-292GLU:B_2-76 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 1.2.4.4 (PDB Primary Data) Search M-CSA Motif + EC 1.2.4.4

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.