4KXV

Human transketolase in covalent complex with donor ketose D-xylulose-5-phosphate, crystal 1

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Structure Motif: Primary M-CSA Annotation

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Transketolase_C	e4kxvA1	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)
A	Transketolase_N	e4kxvA2	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: Transketolase_N	ECOD (1.6)
A	Transket_pyr	e4kxvA3	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)
A	3.40.50.920	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	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
A	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
A	PF00456	Transketolase, thiamine diphosphate binding domain (Transketolase_N)	Transketolase, thiamine diphosphate binding domain	This family includes transketolase enzymes EC:2.2.1.1. and also partially matches to 2-oxoisovalerate dehydrogenase beta subunit Swiss:P37941 EC:1.2.4.4. Both these enzymes utilise thiamine pyrophosphate as a cofactor, suggesting there may be common ...	This family includes transketolase enzymes EC:2.2.1.1. and also partially matches to 2-oxoisovalerate dehydrogenase beta subunit Swiss:P37941 EC:1.2.4.4. Both these enzymes utilise thiamine pyrophosphate as a cofactor, suggesting there may be common aspects in their mechanism of catalysis.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Transketolase	cation binding magnesium ion binding ion binding binding metal ion binding small molecule binding calcium ion binding identical protein binding protein binding protein homodimerization activity protein dimerization activity transketolase activity transketolase or transaldolase activity transferase activity cation binding magnesium ion binding ion binding binding metal ion binding small molecule binding calcium ion binding identical protein binding protein binding protein homodimerization activity protein dimerization activity transketolase activity transketolase or transaldolase activity transferase activity catalytic activity vitamin binding thiamine pyrophosphate binding organic cyclic compound binding anion binding quaternary ammonium group binding heterocyclic compound binding sulfur compound binding	carbohydrate derivative metabolic process glucose 6-phosphate metabolic process nucleobase-containing compound metabolic process organic substance metabolic process purine nucleotide metabolic process heterocycle metabolic process nucleobase-containing small molecule metabolic process pentose-phosphate shunt phosphate-containing compound metabolic process nitrogen compound metabolic process pyridine-containing compound metabolic process small molecule metabolic process phosphorus metabolic process pyridine nucleotide metabolic process carbohydrate derivative metabolic process glucose 6-phosphate metabolic process nucleobase-containing compound metabolic process organic substance metabolic process purine nucleotide metabolic process heterocycle metabolic process nucleobase-containing small molecule metabolic process pentose-phosphate shunt phosphate-containing compound metabolic process nitrogen compound metabolic process pyridine-containing compound metabolic process small molecule metabolic process phosphorus metabolic process pyridine nucleotide metabolic process nucleoside phosphate metabolic process nicotinamide nucleotide metabolic process organonitrogen compound metabolic process cellular metabolic process cellular nitrogen compound metabolic process primary metabolic process generation of precursor metabolites and energy nucleotide metabolic process purine-containing compound metabolic process NADP metabolic process organic cyclic compound metabolic process NADPH regeneration organophosphate metabolic process metabolic process cellular process cellular aromatic compound metabolic process regulation of growth regulation of biological process biological regulation growth carbohydrate derivative biosynthetic process cellular biosynthetic process glyceraldehyde-3-phosphate metabolic process aldehyde biosynthetic process biosynthetic process organophosphate biosynthetic process cellular aldehyde metabolic process organic substance biosynthetic process glyceraldehyde-3-phosphate biosynthetic process ribose phosphate metabolic process pentose-phosphate shunt, non-oxidative branch xylulose 5-phosphate metabolic process xylulose 5-phosphate biosynthetic process	membrane-bounded organelle organelle cellular anatomical entity vesicle extracellular exosome extracellular vesicle extracellular organelle extracellular region extracellular space extracellular membrane-bounded organelle intracellular organelle intracellular anatomical structure peroxisome microbody membrane-bounded organelle organelle cellular anatomical entity vesicle extracellular exosome extracellular vesicle extracellular organelle extracellular region extracellular space extracellular membrane-bounded organelle intracellular organelle intracellular anatomical structure peroxisome microbody cytoplasm intracellular membrane-bounded organelle cytosol nucleus membrane-enclosed lumen intracellular organelle lumen nuclear body nucleoplasm organelle lumen nuclear lumen organelle subcompartment membrane endomembrane system endoplasmic reticulum subcompartment nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum organelle membrane endoplasmic reticulum membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR005474	Transketolase, N-terminal	Domain
A	IPR029061	Thiamin diphosphate-binding fold	Homologous Superfamily
A	IPR009014	Transketolase C-terminal/Pyruvate-ferredoxin oxidoreductase domain II	Homologous Superfamily
A	IPR049557	Transketolase conserved site	Conserved Site
A	IPR005475	Transketolase-like, pyrimidine-binding domain	Domain
A	IPR033248	Transketolase, C-terminal domain	Domain
A	IPR020826	Transketolase binding site	Binding Site

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: P29401	Mammary Neoplasms, Experimental transketolase deficiency Wernicke encephalopathy sarcomatoid carcinoma carcinoma malignant pancreatic neoplasm non-alcoholic fatty liver disease ovarian cancer pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia autism spectrum disorder large cell medulloblastoma lung carcinoma medulloblastoma non-small cell lung carcinoma pancreatic ductal adenocarcinoma Mammary Neoplasms, Experimental transketolase deficiency Wernicke encephalopathy sarcomatoid carcinoma carcinoma malignant pancreatic neoplasm non-alcoholic fatty liver disease ovarian cancer pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia autism spectrum disorder large cell medulloblastoma lung carcinoma medulloblastoma non-small cell lung carcinoma pancreatic ductal adenocarcinoma plasma cell myeloma tuberculosis Wernicke-Korsakoff syndrome B-cell chronic lymphocytic leukemia ductal breast carcinoma in situ lung adenocarcinoma malignant colon neoplasm mammary neoplasms, animal osteosarcoma pancreatic intraductal papillary-mucinous neoplasm undifferentiated carcinoma astrocytic tumor Emery-Dreifuss muscular dystrophy invasive ductal breast carcinoma lung cancer

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

Chains	Enzyme Name	Description	Catalytic Residues
A	transketolase M-CSA #219	Transketolase (EC:2.2.1.1) (TK) catalyses the reversible transfer of a two-carbon ketol unit from xylulose 5-phosphate to an aldose receptor, such as ribose 5-phosphate, to form sedoheptulose 7-phosphate and glyceraldehyde 3- phosphate. This enzyme, together with transaldolase, provides a link between the glycolytic and pentose-phosphate pathways. TK requires thiamine pyrophosphate and a divalent metal cation as a cofactor. Catalytic activity has been noted with a wide variety of divalent metal ions coordinating the diphosphate group of the cofactor [PMID:9924800] and whilst there is still some debate as to the exact nature of the native metal cation (most of the work on the determination of the mechanism has utilised the magnesium cation), Esakova et al. have determined that the enzyme is more stable in the presence of Ca(II), making this the more likely native metal cation [PMID:16125202] .	Defined by 2 residues: LYS:A-244HIS:A-258 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 2.2.1.1 (PDB Primary Data) Search M-CSA Motif + EC 2.2.1.1

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.