1K3E

Type III secretion chaperone CesT

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1k3ea_	Alpha and beta proteins (a+b)	Secretion chaperone-like	Type III secretory system chaperone-like	Type III secretory system chaperone	Secretion chaperone CesT	(Escherichia coli O157:H7 ) [TaxId: 83334 ],	SCOPe (2.08)
B	d1k3eb_	Alpha and beta proteins (a+b)	Secretion chaperone-like	Type III secretory system chaperone-like	Type III secretory system chaperone	Secretion chaperone CesT	(Escherichia coli O157:H7 ) [TaxId: 83334 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Type III secretory system chaperone	8025401	4003372	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Type III secretory system chaperone-like	8037780	3000727	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	Type III secretory system chaperone-like	8037780	3000727	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	CesT	e1k3eA1	A: a+b two layers	X: Type III secretory system chaperone-like	H: Type III secretory system chaperone (From Topology)	T: Type III secretory system chaperone	F: CesT	ECOD (1.6)
B	CesT	e1k3eB1	A: a+b two layers	X: Type III secretory system chaperone-like	H: Type III secretory system chaperone (From Topology)	T: Type III secretory system chaperone	F: CesT	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.287.390	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (4.3.0)
A	3.30.1460.10	Alpha Beta	2-Layer Sandwich	Yope Regulator	Chain: A,	CATH (4.3.0)
B	1.10.287.390	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (4.3.0)
B	3.30.1460.10	Alpha Beta	2-Layer Sandwich	Yope Regulator	Chain: A,	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF05932	Tir chaperone protein (CesT) family (CesT)	Tir chaperone protein (CesT) family	This family consists of a number of bacterial sequences which are highly similar to the Tir chaperone protein in E. Coli. In many Gram-negative bacteria, a key indicator of pathogenic potential is the possession of a specialised type III secretion sy ...	This family consists of a number of bacterial sequences which are highly similar to the Tir chaperone protein in E. Coli. In many Gram-negative bacteria, a key indicator of pathogenic potential is the possession of a specialised type III secretion system, which is utilised to deliver virulence effector proteins directly into the host cell cytosol. Many of the proteins secreted from such systems require small cytosolic chaperones to maintain the secreted substrates in a secretion-competent state. CesT serves a chaperone function for the enteropathogenic Escherichia coli (EPEC) translocated intimin receptor (Tir) protein, which confers upon EPEC the ability to alter host cell morphology following intimate bacterial attachment [1]. This family also contains several DspF and related sequences from several plant pathogenic bacteria. The "disease-specific" (dsp) region next to the hrp gene cluster of Erwinia amylovora is required for pathogenicity but not for elicitation of the hypersensitive reaction. DspF and AvrF are small (16 kDa and 14 kDa) and acidic with predicted amphipathic alpha helices in their C termini; they resemble chaperones for virulence factors secreted by type III secretion systems of animal pathogens [2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	CesT	-	protein localization establishment of protein localization cellular localization nitrogen compound transport transport secretion protein secretion by the type III secretion system establishment of protein localization to extracellular region export from cell protein secretion establishment of localization protein localization to extracellular region transmembrane transport localization secretion by cell protein localization establishment of protein localization cellular localization nitrogen compound transport transport secretion protein secretion by the type III secretion system establishment of protein localization to extracellular region export from cell protein secretion establishment of localization protein localization to extracellular region transmembrane transport localization secretion by cell protein transmembrane transport protein transport cellular macromolecule localization macromolecule localization cellular process	cellular anatomical structure intracellular anatomical structure cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR010261	Tir chaperone protein (CesT) family	Family

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.