1JYO
Structure of the Salmonella Virulence Effector SptP in Complex with its Secretion Chaperone SicP
Summary for 1JYO
| Entry DOI | 10.2210/pdb1jyo/pdb |
| Descriptor | SicP, protein tyrosine phosphatase SptP (3 entities in total) |
| Functional Keywords | salmonella, bacterial pathogenesis, infectious disease, virulence factor, type iii secretion, chaperone, unfolded, protein folding, sptp, sicp |
| Biological source | Salmonella typhimurium More |
| Cellular location | Cytoplasm: O85300 Secreted: P74873 |
| Total number of polymer chains | 6 |
| Total formula weight | 81763.37 |
| Authors | Stebbins, C.E.,Galan, J.E. (deposition date: 2001-09-12, release date: 2001-11-07, Last modification date: 2024-10-16) |
| Primary citation | Stebbins, C.E.,Galan, J.E. Maintenance of an unfolded polypeptide by a cognate chaperone in bacterial type III secretion. Nature, 414:77-81, 2001 Cited by PubMed Abstract: 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. PubMed: 11689946DOI: 10.1038/35102073 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.9 Å) |
Structure validation
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