View source for 5f9d


==Blood group antigen binding adhesin BabA of Helicobacter pylori strain P436 in complex with Lewis b blood group B heptasaccharide==
<StructureSection load='5f9d' size='340' side='right'caption='[[5f9d]], [[Resolution|resolution]] 2.59&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5f9d]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Helicobacter_pylori Helicobacter pylori] and [https://en.wikipedia.org/wiki/Lama_glama Lama glama]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5F9D OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5F9D FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.59&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene>, <scene name='pdbligand=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=GAL:BETA-D-GALACTOSE'>GAL</scene>, <scene name='pdbligand=GLA:ALPHA+D-GALACTOSE'>GLA</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></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=5f9d FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5f9d OCA], [https://pdbe.org/5f9d PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5f9d RCSB], [https://www.ebi.ac.uk/pdbsum/5f9d PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5f9d ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/O52269_HELPX O52269_HELPX] [https://www.uniprot.org/uniprot/Q6DT10_HELPX Q6DT10_HELPX] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The Helicobacter pylori adhesin BabA binds mucosal ABO/Le(b) blood group (bg) carbohydrates. BabA facilitates bacterial attachment to gastric surfaces, increasing strain virulence and forming a recognized risk factor for peptic ulcers and gastric cancer. High sequence variation causes BabA functional diversity, but the underlying structural-molecular determinants are unknown. We generated X-ray structures of representative BabA isoforms that reveal a polymorphic, three-pronged Le(b) binding site. Two diversity loops, DL1 and DL2, provide adaptive control to binding affinity, notably ABO versus O bg preference. H. pylori strains can switch bg preference with single DL1 amino acid substitutions, and can coexpress functionally divergent BabA isoforms. The anchor point for receptor binding is the embrace of an ABO fucose residue by a disulfide-clasped loop, which is inactivated by reduction. Treatment with the redox-active pharmaceutic N-acetylcysteine lowers gastric mucosal neutrophil infiltration in H. pylori-infected Le(b)-expressing mice, providing perspectives on possible H. pylori eradication therapies.

Structural Insights into Polymorphic ABO Glycan Binding by Helicobacter pylori.,Moonens K, Gideonsson P, Subedi S, Bugaytsova J, Romao E, Mendez M, Norden J, Fallah M, Rakhimova L, Shevtsova A, Lahmann M, Castaldo G, Brannstrom K, Coppens F, Lo AW, Ny T, Solnick JV, Vandenbussche G, Oscarson S, Hammarstrom L, Arnqvist A, Berg DE, Muyldermans S, Boren T, Remaut H Cell Host Microbe. 2016 Jan 13;19(1):55-66. doi: 10.1016/j.chom.2015.12.004. PMID:26764597<ref>PMID:26764597</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5f9d" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Helicobacter pylori]]
[[Category: Lama glama]]
[[Category: Large Structures]]
[[Category: Boren T]]
[[Category: Gideonsson P]]
[[Category: Moonens K]]
[[Category: Muyldermans S]]
[[Category: Oscarson S]]
[[Category: Remaut H]]
[[Category: Romao E]]
[[Category: Subedi S]]