3g20

Crystal structure of the major pseudopilin from the type 2 secretion system of enterohaemorrhagic Escherichia coli

spinqualitylabelsall models 3g20, resolution 1.78Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3g20 is a 2 chain structure with sequence from Escherichia coli O157:H7. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.78Å Ligands: CA, GOL, NA, NHE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q7BSV8_ECO57 Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The pseudopilus is a key feature of the type 2 secretion system (T2SS) and is made up of multiple pseudopilins that are similar in fold to the type 4 pilins. However, pilins have disulfide bridges, whereas the major pseudopilins of T2SS do not. A key question is therefore how the pseudopilins, and in particular, the most abundant major pseudopilin, GspG, obtain sufficient stability to perform their function. Crystal structures of Vibrio cholerae, Vibrio vulnificus, and enterohemorrhagic Escherichia coli (EHEC) GspG were elucidated, and all show a calcium ion bound at the same site. Conservation of the calcium ligands fully supports the suggestion that calcium ion binding by the major pseudopilin is essential for the T2SS. Functional studies of GspG with mutated calcium ion-coordinating ligands were performed to investigate this hypothesis and show that in vivo protease secretion by the T2SS is severely impaired. Taking all evidence together, this allows the conclusion that, in complete contrast to the situation in the type 4 pili system homologs, in the T2SS, the major protein component of the central pseudopilus is dependent on calcium ions for activity. Calcium is essential for the major pseudopilin in the type 2 secretion system.,Korotkov KV, Gray MD, Kreger A, Turley S, Sandkvist M, Hol WG J Biol Chem. 2009 Sep 18;284(38):25466-70. Epub 2009 Jul 29. PMID:19640838 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Pseudopilin

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