2y9j

THREE-DIMENSIONAL MODEL OF SALMONELLA'S NEEDLE COMPLEX AT SUBNANOMETER RESOLUTIONTHREE-DIMENSIONAL MODEL OF SALMONELLA'S NEEDLE COMPLEX AT SUBNANOMETER RESOLUTION

2y9j, resolution 6.40Å Show:Asymmetric Unit Biological Assembly Structural highlights 2y9j is a 48 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: Electron Microscopy, Resolution 6.4Å Experimental data: Check Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PRGH_SALTY Required for invasion of epithelial cells. Publication Abstract from PubMed Type III secretion systems (T3SSs) are essential virulence factors used by many Gram-negative bacteria to inject proteins that make eukaryotic host cells accessible to invasion. The T3SS core structure, the needle complex (NC), is a ~3.5 megadalton-sized, oligomeric, membrane-embedded complex. Analyzing cryo-electron microscopy images of top views of NCs or NC substructures from Salmonella typhimurium revealed a 24-fold symmetry for the inner rings and a 15-fold symmetry for the outer rings, giving an overall C3 symmetry. Local refinement and averaging showed the organization of the central core and allowed us to reconstruct a subnanometer composite structure of the NC, which together with confident docking of atomic structures reveal insights into its overall organization and structural requirements during assembly. Three-dimensional model of Salmonella's needle complex at subnanometer resolution.,Schraidt O, Marlovits TC Science. 2011 Mar 4;331(6021):1192-5. PMID:21385715 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.