This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.
Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.
6y54
From Proteopedia
(Difference between revisions)
m (Protected "6y54" [edit=sysop:move=sysop]) |
|||
| (2 intermediate revisions not shown.) | |||
| Line 1: | Line 1: | ||
| - | '''Unreleased structure''' | ||
| - | + | ==Crystal structure of a Neisseria meningitidis serogroup A capsular oligosaccharide bound to a functional Fab== | |
| + | <StructureSection load='6y54' size='340' side='right'caption='[[6y54]], [[Resolution|resolution]] 2.67Å' scene=''> | ||
| + | == Structural highlights == | ||
| + | <table><tr><td colspan='2'>[[6y54]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6Y54 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6Y54 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]] 2.67Å</td></tr> | ||
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=IOD:IODIDE+ION'>IOD</scene>, <scene name='pdbligand=OA8:{[(2R,3S,4R,5S,6S)-3-(acetyloxy)-5-acetamido-4,6-dihydroxyoxan-2-yl]methoxy}phosphonic+acid'>OA8</scene>, <scene name='pdbligand=OAB:{[(2R,3S,4R,5S,6S)-5-acetamido-3,6-dihydroxy-4-(2-oxopropyl)oxan-2-yl]methoxy}phosphonic+acid'>OAB</scene>, <scene name='pdbligand=OOW:{[(2R,3S,4R,5S,6R)-5-acetamido-3-hydroxy-4-(2-oxopropyl)-6-(phosphonooxy)oxan-2-yl]methoxy}phosphonic+acid'>OOW</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=6y54 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6y54 OCA], [https://pdbe.org/6y54 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6y54 RCSB], [https://www.ebi.ac.uk/pdbsum/6y54 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6y54 ProSAT]</span></td></tr> | ||
| + | </table> | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Meningococcal meningitis remains a substantial cause of mortality and morbidity worldwide. Until recently, countries in the African meningitis belt were susceptible to devastating outbreaks, largely attributed to serogroup A Neisseria meningitidis (MenA). Vaccination with glycoconjugates of MenA capsular polysaccharide led to an almost complete elimination of MenA clinical cases. To understand the molecular basis of vaccine-induced protection, we generated a panel of oligosaccharide fragments of different lengths and tested them with polyclonal and monoclonal antibodies by inhibition enzyme-linked immunosorbent assay, surface plasmon resonance, and competitive human serum bactericidal assay, which is a surrogate for protection. The epitope was shown to optimize between three and six repeating units and to be O-acetylated. The molecular interactions between a protective monoclonal antibody and a MenA capsular polysaccharide fragment were further elucidated at the atomic level by saturation transfer difference NMR spectroscopy and X-ray crystallography. The epitope consists of a trisaccharide anchored to the antibody via the O- and N-acetyl moieties through either H-bonding or CH-pi interactions. In silico docking showed that 3-O-acetylation of the upstream residue is essential for antibody binding, while O-acetate could be equally accommodated at three and four positions of the other two residues. These results shed light on the mechanism of action of current MenA vaccines and provide a foundation for the rational design of improved therapies. | ||
| - | + | Structure of a protective epitope reveals the importance of acetylation of Neisseria meningitidis serogroup A capsular polysaccharide.,Henriques P, Dello Iacono L, Gimeno A, Biolchi A, Romano MR, Arda A, Bernardes GJL, Jimenez-Barbero J, Berti F, Rappuoli R, Adamo R Proc Natl Acad Sci U S A. 2020 Nov 6. pii: 2011385117. doi:, 10.1073/pnas.2011385117. PMID:33158970<ref>PMID:33158970</ref> | |
| - | + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |
| - | [[Category: | + | </div> |
| + | <div class="pdbe-citations 6y54" style="background-color:#fffaf0;"></div> | ||
| + | |||
| + | ==See Also== | ||
| + | *[[Monoclonal Antibodies 3D structures|Monoclonal Antibodies 3D structures]] | ||
| + | == References == | ||
| + | <references/> | ||
| + | __TOC__ | ||
| + | </StructureSection> | ||
| + | [[Category: Large Structures]] | ||
| + | [[Category: Mus musculus]] | ||
| + | [[Category: Adamo R]] | ||
| + | [[Category: Dello Iacono L]] | ||
| + | [[Category: Henriques P]] | ||
Current revision
Crystal structure of a Neisseria meningitidis serogroup A capsular oligosaccharide bound to a functional Fab
| |||||||||||
