4xrc

From Proteopedia

(Difference between revisions)

Revision as of 10:17, 26 February 2016

Antibody hemagglutinin Complexes

Structural highlights

4xrc is a 6 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Related:	4xnm
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[Q6Q9G9_9INFA] Binds to sialic acid-containing receptors on the cell surface, bringing about the attachment of the virus particle to the cell. This attachment induces virion internalization of about two third of the virus particles through clathrin-dependent endocytosis and about one third through a clathrin- and caveolin-independent pathway. Plays a major role in the determination of host range restriction and virulence. Class I viral fusion protein. Responsible for penetration of the virus into the cell cytoplasm by mediating the fusion of the membrane of the endocytosed virus particle with the endosomal membrane. Low pH in endosomes induces an irreversible conformational change in HA2, releasing the fusion hydrophobic peptide. Several trimers are required to form a competent fusion pore.[RuleBase:RU003324] Binds to sialic acid-containing receptors on the cell surface, bringing about the attachment of the virus particle to the cell. This attachment induces virion internalization of about two third of the virus particles through clathrin-dependent endocytosis and about one third through a clathrin- and caveolin-independent pathway. Plays a major role in the determination of host range restriction and virulence. Class I viral fusion protein. Responsible for penetration of the virus into the cell cytoplasm by mediating the fusion of the membrane of the endocytosed virus particle with the endosomal membrane. Low pH in endosomes induces an irreversible conformational change in HA2, releasing the fusion hydrophobic peptide. Several trimers are required to form a competent fusion pore (By similarity).[SAAS:SAAS00204388]

Publication Abstract from PubMed

Antigenic drift of circulating seasonal influenza viruses necessitates an international vaccine effort to reduce the impact on human health. A critical feature of the seasonal vaccine is that it stimulates an already primed immune system to diversify memory B cells to recognize closely related, but antigenically distinct, influenza glycoproteins (hemagglutinins). Influenza pandemics arise when hemagglutinins to which no preexisting adaptive immunity exists acquire the capacity to infect humans. Hemagglutinin 5 is one subtype to which little preexisting immunity exists and is only a few acquired mutations away from the ability to transmit efficiently between ferrets, and possibly humans. Here, we describe the structure and molecular mechanism of neutralization by H5.3, a vaccine-elicited antibody that neutralizes hemagglutinin 5 viruses and variants with expanded host range. H5.3 binds in the receptor-binding site, forming contacts that recapitulate many of the sialic acid interactions, as well as multiple peripheral interactions, yet is not sensitive to mutations that alter sialic acid binding. H5.3 is highly specific for a subset of H5 strains, and this specificity arises from interactions to the periphery of the receptor-binding site. H5.3 is also extremely potent, despite retaining germ line-like conformational flexibility.

Vaccine-elicited antibody that neutralizes H5N1 influenza and variants binds the receptor site and polymorphic sites.,Winarski KL, Thornburg NJ, Yu Y, Sapparapu G, Crowe JE Jr, Spiller BW Proc Natl Acad Sci U S A. 2015 Jul 13. pii: 201502762. PMID:26170302^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Winarski KL, Thornburg NJ, Yu Y, Sapparapu G, Crowe JE Jr, Spiller BW. Vaccine-elicited antibody that neutralizes H5N1 influenza and variants binds the receptor site and polymorphic sites. Proc Natl Acad Sci U S A. 2015 Jul 13. pii: 201502762. PMID:26170302 doi:http://dx.doi.org/10.1073/pnas.1502762112

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4xrc"

@@ Line 1: / Line 1: @@
 ==Antibody hemagglutinin Complexes==
 <StructureSection load='4xrc' size='340' side='right' caption='[[4xrc]], [[Resolution|resolution]] 2.74&Aring;' scene=''>
@@ Line 5: / Line 6: @@
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=FUC:ALPHA-L-FUCOSE'>FUC</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4xnm|4xnm]]</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=4xrc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4xrc OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4xrc RCSB], [http://www.ebi.ac.uk/pdbsum/4xrc PDBsum]</span></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=4xrc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4xrc OCA], [http://pdbe.org/4xrc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4xrc RCSB], [http://www.ebi.ac.uk/pdbsum/4xrc PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 17: / Line 18: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4xrc" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

4xrc

From Proteopedia

Revision as of 10:17, 26 February 2016

Antibody hemagglutinin Complexes

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

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