1jyo

Structure of the Salmonella Virulence Effector SptP in Complex with its Secretion Chaperone SicP

spinqualitylabelsall models 1jyo, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1jyo is a 6 chain structure with sequence from Salmonella enterica subsp. enterica serovar Typhimurium. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SICP_SALTY Molecular chaperone required for sptP stabilization and secretion. Publication Abstract from PubMed Many bacterial pathogens use a type III protein secretion system to deliver virulence effector proteins directly into the host cell cytosol, where they modulate cellular processes. A requirement for the effective translocation of several such effector proteins is the binding of specific cytosolic chaperones, which typically interact with discrete domains in the virulence factors. We report here the crystal structure at 1.9 A resolution of the chaperone-binding domain of the Salmonella effector protein SptP with its cognate chaperone SicP. The structure reveals that this domain is maintained in an extended, unfolded conformation that is wound around three successive chaperone molecules. Short segments from two different SptP molecules are juxtaposed by the chaperones, where they dimerize across a hydrophobic interface. These results imply that the chaperones associated with the type III secretion system maintain their substrates in a secretion-competent state that is capable of engaging the secretion machinery to travel through the type III apparatus in an unfolded or partially folded manner. Maintenance of an unfolded polypeptide by a cognate chaperone in bacterial type III secretion.,Stebbins CE, Galan JE Nature. 2001 Nov 1;414(6859):77-81. PMID:11689946 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Tyrosine phosphatase 3D structures

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