5f97

Blood group antigen binding adhesin BabA of Helicobacter pylori strain A730 in complex with blood group A type 1 hexasaccharide

spinqualitylabelsall models 5f97, resolution 2.62Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5f97 is a 8 chain structure with sequence from Helicobacter pylori and Lama glama. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.62Å Ligands: A2G, BGC, FUC, GAL, NAG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function O52269_HELPX Q6DSX7_HELPX 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 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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