4m5z

From Proteopedia

(Difference between revisions)

Revision as of 20:15, 25 December 2014

Crystal structure of broadly neutralizing antibody 5J8 bound to 2009 pandemic influenza hemagglutinin, HA1 subunit

Structural highlights

4m5z is a 3 chain structure with sequence from Homo sapiens and Influenza a virus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	4m4y, 4m5y
Gene:	HA (Influenza A virus)
Resources:	FirstGlance, OCA, RCSB, PDBsum

Function

[G8XMJ2_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 (By similarity).[RuleBase:RU003324][SAAS:SAAS013827_004_327643]

Publication Abstract from PubMed

Influenza virus is a global health concern due to its unpredictable pandemic potential. This potential threat was realized in 2009 when an H1N1 virus emerged that resembled the 1918 virus in antigenicity, but fortunately was not nearly as deadly. 5J8 is a human antibody that potently neutralizes a broad spectrum of H1N1 viruses, including the 1918 and 2009 pandemic viruses. Here, we present the crystal structure of 5J8 Fab in complex with a bacterially expressed and refolded globular head domain from the hemagglutinin (HA) of the A/California/07/2009 (H1N1) pandemic virus. 5J8 recognizes a conserved epitope in and around the receptor binding site (RBS) and its HCDR3 closely mimics interactions of the sialic acid receptor. EM reconstructions of 5J8 Fab in complex with an HA trimer from a 1986 H1 strain and with an engineered stabilized HA trimer from the 2009 H1 pandemic virus showed a similar mode of binding. As for other characterized RBS-targeted antibodies, 5J8 uses avidity to extend its breadth and affinity against divergent H1 strains. 5J8 selectively interacts with HA insertion residue 133a, which is conserved in pandemic H1 strains and has precluded binding of other RBS-targeted antibodies. Thus, the RBS of divergent HAs is targeted by 5J8 and adds to the growing arsenal of common recognition motifs for design of therapeutics and vaccines. Moreover, consistent with previous studies, bacterially expressed H1 HA properly refolds, retaining its antigenic structure, and presents a low-cost and rapid alternative for engineering and manufacturing candidate flu vaccines.

Antibody Recognition of the Pandemic H1N1 Influenza Hemagglutinin Receptor Binding Site.,Hong M, Lee PS, Hoffman RM, Zhu X, Krause JC, Laursen NS, Yoon SI, Song L, Tussey L, Crowe JE Jr, Ward AB, Wilson IA J Virol. 2013 Sep 11. PMID:24027321^[1]

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

References

↑ Hong M, Lee PS, Hoffman RM, Zhu X, Krause JC, Laursen NS, Yoon SI, Song L, Tussey L, Crowe JE Jr, Ward AB, Wilson IA. Antibody Recognition of the Pandemic H1N1 Influenza Hemagglutinin Receptor Binding Site. J Virol. 2013 Sep 11. PMID:24027321 doi:10.1128/JVI.01388-13

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4m5z"

@@ Line 7: / Line 7: @@
 <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=4m5z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4m5z OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4m5z RCSB], [http://www.ebi.ac.uk/pdbsum/4m5z PDBsum]</span></td></tr>
 </table>
+== Function ==
+[[http://www.uniprot.org/uniprot/G8XMJ2_9INFA G8XMJ2_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 (By similarity).[RuleBase:RU003324][SAAS:SAAS013827_004_327643]
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==

4m5z

From Proteopedia

Revision as of 20:15, 25 December 2014

Crystal structure of broadly neutralizing antibody 5J8 bound to 2009 pandemic influenza hemagglutinin, HA1 subunit

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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