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6ofh

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==Structure of Salmonella type III secretion system needle filament==
==Structure of Salmonella type III secretion system needle filament==
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<StructureSection load='6ofh' size='340' side='right'caption='[[6ofh]], [[Resolution|resolution]] 3.70&Aring;' scene=''>
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<SX load='6ofh' size='340' side='right' viewer='molstar' caption='[[6ofh]], [[Resolution|resolution]] 3.70&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[6ofh]] is a 19 chain structure with sequence from [http://en.wikipedia.org/wiki/Salts Salts]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6OFH OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6OFH FirstGlance]. <br>
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<table><tr><td colspan='2'>[[6ofh]] is a 19 chain structure with sequence from [https://en.wikipedia.org/wiki/Salmonella_enterica_subsp._enterica_serovar_Typhimurium_str._SL1344 Salmonella enterica subsp. enterica serovar Typhimurium str. SL1344]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6OFH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6OFH FirstGlance]. <br>
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</td></tr><tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6ofh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ofh OCA], [http://pdbe.org/6ofh PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6ofh RCSB], [http://www.ebi.ac.uk/pdbsum/6ofh PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6ofh ProSAT]</span></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.7&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6ofh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6ofh OCA], [https://pdbe.org/6ofh PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6ofh RCSB], [https://www.ebi.ac.uk/pdbsum/6ofh PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6ofh ProSAT]</span></td></tr>
</table>
</table>
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<div style="background-color:#fffaf0;">
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== Function ==
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== Publication Abstract from PubMed ==
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[https://www.uniprot.org/uniprot/PRGI_SALTY PRGI_SALTY] Required for invasion of epithelial cells.
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Type III protein-secretion machines are essential for the interactions of many pathogenic or symbiotic bacterial species with their respective eukaryotic hosts. The core component of these machines is the injectisome, a multiprotein complex that mediates the selection of substrates, their passage through the bacterial envelope, and ultimately their delivery into eukaryotic target cells. The injectisome is composed of a large cytoplasmic complex or sorting platform, a multiring base embedded in the bacterial envelope, and a needle-like filament that protrudes several nanometers from the bacterial surface and is capped at its distal end by the tip complex. A characteristic feature of these machines is that their activity is stimulated by contact with target host cells. The sensing of target cells, thought to be mediated by the distal tip of the needle filament, generates an activating signal that must be transduced to the secretion machine by the needle filament. Here, through a multidisciplinary approach, including solid-state NMR (SSNMR) and cryo electron microscopy (cryo-EM) analyses, we have identified critical residues of the needle filament protein of a Salmonella Typhimurium type III secretion system that are involved in the regulation of the activity of the secretion machine. We found that mutations in the needle filament protein result in various specific phenotypes associated with different steps in the type III secretion process. More specifically, these studies reveal an important role for a polymorphic helix of the needle filament protein and the residues that line the lumen of its central channel in the control of type III secretion.
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A polymorphic helix of a Salmonella needle protein relays signals defining distinct steps in type III secretion.,Guo EZ, Desrosiers DC, Zalesak J, Tolchard J, Berbon M, Habenstein B, Marlovits T, Loquet A, Galan JE PLoS Biol. 2019 Jul 1;17(7):e3000351. doi: 10.1371/journal.pbio.3000351. PMID:31260457<ref>PMID:31260457</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 6ofh" style="background-color:#fffaf0;"></div>
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== References ==
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<references/>
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__TOC__
__TOC__
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</StructureSection>
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</SX>
[[Category: Large Structures]]
[[Category: Large Structures]]
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[[Category: Salts]]
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[[Category: Salmonella enterica subsp. enterica serovar Typhimurium str. SL1344]]
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[[Category: Galan, J E]]
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[[Category: Galan JE]]
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[[Category: Guo, E Z]]
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[[Category: Guo EZ]]
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[[Category: Helical reconstruction]]
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[[Category: Protein transport]]
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[[Category: Salmonella]]
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[[Category: Type iii secretion system]]
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Current revision

Structure of Salmonella type III secretion system needle filament

6ofh, resolution 3.70Å

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