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==Helicobacter pylori Vacuolating Cytotoxin A Oligomeric Assembly 2b (OA-2b)==
<SX load='6nyj' size='340' side='right' viewer='molstar' caption='[[6nyj]], [[Resolution|resolution]] 3.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6nyj]] is a 12 chain structure with sequence from [https://en.wikipedia.org/wiki/Helicobacter_pylori Helicobacter pylori]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6NYJ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6NYJ FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 3.2&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=6nyj FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6nyj OCA], [https://pdbe.org/6nyj PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6nyj RCSB], [https://www.ebi.ac.uk/pdbsum/6nyj PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6nyj ProSAT]</span></td></tr>
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== Function ==
[https://www.uniprot.org/uniprot/VACA2_HELPX VACA2_HELPX] Induces vacuolation of eukaryotic cells. Causes ulceration and gastric lesions.
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== Publication Abstract from PubMed ==
Human gastric pathogen Helicobacter pylori (H. pylori) is the primary risk factor for gastric cancer and is one of the most prevalent carcinogenic infectious agents. Vacuolating cytotoxin A (VacA) is a key virulence factor secreted by H. pylori and induces multiple cellular responses. Although structural and functional studies of VacA have been extensively performed, the high-resolution structure of a full-length VacA protomer and the molecular basis of its oligomerization are still unknown. Here, we use cryoelectron microscopy to resolve 10 structures of VacA assemblies, including monolayer (hexamer and heptamer) and bilayer (dodecamer, tridecamer, and tetradecamer) oligomers. The models of the 88-kDa full-length VacA protomer derived from the near-atomic resolution maps are highly conserved among different oligomers and show a continuous right-handed beta-helix made up of two domains with extensive domain-domain interactions. The specific interactions between adjacent protomers in the same layer stabilizing the oligomers are well resolved. For double-layer oligomers, we found short- and/or long-range hydrophobic interactions between protomers across the two layers. Our structures and other previous observations lead to a mechanistic model wherein VacA hexamer would correspond to the prepore-forming state, and the N-terminal region of VacA responsible for the membrane insertion would undergo a large conformational change to bring the hydrophobic transmembrane region to the center of the oligomer for the membrane channel formation.

Cryo-EM structures of Helicobacter pylori vacuolating cytotoxin A oligomeric assemblies at near-atomic resolution.,Zhang K, Zhang H, Li S, Pintilie GD, Mou TC, Gao Y, Zhang Q, van den Bedem H, Schmid MF, Au SWN, Chiu W Proc Natl Acad Sci U S A. 2019 Mar 20. pii: 1821959116. doi:, 10.1073/pnas.1821959116. PMID:30894496<ref>PMID:30894496</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 6nyj" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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[[Category: Helicobacter pylori]]
[[Category: Large Structures]]
[[Category: Au S]]
[[Category: Chiu W]]
[[Category: Li S]]
[[Category: Zhang H]]
[[Category: Zhang K]]