4kth

From Proteopedia

(Difference between revisions)

Revision as of 14:44, 25 December 2014

Structure of A/Hubei/1/2010 H5 HA

Structural highlights

4kth is a 6 chain structure with sequence from Influenza a virus (a/hubei/1/2010(h5n1)). Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	4kw1, 4kwm
Gene:	HA (Influenza A virus (A/Hubei/1/2010(H5N1)))
Resources:	FirstGlance, OCA, RCSB, PDBsum

Function

[G2U0T8_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:SAAS013828_004_327643]

Publication Abstract from PubMed

Antigenic variation among circulating H5N1 highly pathogenic avian influenza A viruses mandates the continuous production of strain-specific pre-pandemic vaccine candidates and represents a significant challenge for pandemic preparedness. Here we assessed the structural, antigenic and receptor-binding properties of three H5N1 HPAI virus hemagglutinins, which were recently selected by the WHO as vaccine candidates [A/Egypt/N03072/2010 (Egypt10, clade 2.2.1), A/Hubei/1/2010 (Hubei10, clade 2.3.2.1) and A/Anhui/1/2005 (Anhui05, clade 2.3.4)]. These analyses revealed that antigenic diversity among these three isolates was restricted to changes in the size and charge of amino acid side chains at a handful of positions, spatially equivalent to the antigenic sites identified in H1 subtype viruses circulating among humans. All three of the H5N1 viruses analyzed in this study were responsible for fatal human infections, with the most recently-isolated strains, Hubei10 and Egypt10, containing multiple residues in the receptor-binding site of the HA, which were suspected to enhance mammalian transmission. However, glycan-binding analyses demonstrated a lack of binding to human alpha2-6-linked sialic acid receptor analogs for all three HAs, reinforcing the notion that receptor-binding specificity contributes only partially to transmissibility and pathogenesis of HPAI viruses and suggesting that changes in host specificity must be interpreted in the context of the host and environmental factors, as well as the virus as a whole. Together, our data reveal structural linkages with phylogenetic and antigenic analyses of recently emerged H5N1 virus clades and should assist in interpreting the significance of future changes in antigenic and receptor-binding properties.

Structural and Antigenic Variation among Diverse Clade 2 H5N1 Viruses.,Shore DA, Yang H, Balish AL, Shepard SS, Carney PJ, Chang JC, Davis CT, Donis RO, Villanueva JM, Klimov AI, Stevens J PLoS One. 2013 Sep 27;8(9):e75209. doi: 10.1371/journal.pone.0075209. PMID:24086467^[1]

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

References

↑ Shore DA, Yang H, Balish AL, Shepard SS, Carney PJ, Chang JC, Davis CT, Donis RO, Villanueva JM, Klimov AI, Stevens J. Structural and Antigenic Variation among Diverse Clade 2 H5N1 Viruses. PLoS One. 2013 Sep 27;8(9):e75209. doi: 10.1371/journal.pone.0075209. PMID:24086467 doi:http://dx.doi.org/10.1371/journal.pone.0075209

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/4kth"

@@ Line 8: / Line 8: @@
 <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=4kth FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kth OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4kth RCSB], [http://www.ebi.ac.uk/pdbsum/4kth PDBsum]</span></td></tr>
 </table>
+== Function ==
+[[http://www.uniprot.org/uniprot/G2U0T8_9INFA G2U0T8_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:SAAS013828_004_327643]
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==

4kth

From Proteopedia

Revision as of 14:44, 25 December 2014

Structure of A/Hubei/1/2010 H5 HA

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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