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.

4bh2

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 10:36, 5 August 2016

Crystal Structure of the Haemagglutinin from a Transmissible Mutant H5 Influenza Virus

Structural highlights

4bh2 is a 2 chain structure with sequence from Influenza a virus (a/viet nam/1203/2004(h5n1)). Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, , ,
Related:	4bgw, 4bgx, 4bgy, 4bgz, 4bh0, 4bh1, 4bh3, 4bh4
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[Q5EP31_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:SAAS008980_004_327643]

Publication Abstract from PubMed

Cell-surface-receptor binding by influenza viruses is a key determinant of their transmissibility, both from avian and animal species to humans as well as from human to human. Highly pathogenic avian H5N1 viruses that are a threat to public health have been observed to acquire affinity for human receptors, and transmissible-mutant-selection experiments have identified a virus that is transmissible in ferrets, the generally accepted experimental model for influenza in humans. Here, our quantitative biophysical measurements of the receptor-binding properties of haemagglutinin (HA) from the transmissible mutant indicate a small increase in affinity for human receptor and a marked decrease in affinity for avian receptor. From analysis of virus and HA binding data we have derived an algorithm that predicts virus avidity from the affinity of individual HA-receptor interactions. It reveals that the transmissible-mutant virus has a 200-fold preference for binding human over avian receptors. The crystal structure of the transmissible-mutant HA in complex with receptor analogues shows that it has acquired the ability to bind human receptor in the same folded-back conformation as seen for HA from the 1918, 1957 (ref. 4), 1968 (ref. 5) and 2009 (ref. 6) pandemic viruses. This binding mode is substantially different from that by which non-transmissible wild-type H5 virus HA binds human receptor. The structure of the complex also explains how the change in preference from avian to human receptors arises from the Gln226Leu substitution, which facilitates binding to human receptor but restricts binding to avian receptor. Both features probably contribute to the acquisition of transmissibility by this mutant virus.

Receptor binding by a ferret-transmissible H5 avian influenza virus.,Xiong X, Coombs PJ, Martin SR, Liu J, Xiao H, McCauley JW, Locher K, Walker PA, Collins PJ, Kawaoka Y, Skehel JJ, Gamblin SJ Nature. 2013 Apr 24. doi: 10.1038/nature12144. PMID:23615615^[1]

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

References

↑ Xiong X, Coombs PJ, Martin SR, Liu J, Xiao H, McCauley JW, Locher K, Walker PA, Collins PJ, Kawaoka Y, Skehel JJ, Gamblin SJ. Receptor binding by a ferret-transmissible H5 avian influenza virus. Nature. 2013 Apr 24. doi: 10.1038/nature12144. PMID:23615615 doi:10.1038/nature12144

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/4bh2"

@@ Line 1: / Line 1: @@
 ==Crystal Structure of the Haemagglutinin from a Transmissible Mutant H5 Influenza Virus==
 <StructureSection load='4bh2' size='340' side='right' caption='[[4bh2]], [[Resolution|resolution]] 2.12&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=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=EPE:4-(2-HYDROXYETHYL)-1-PIPERAZINE+ETHANESULFONIC+ACID'>EPE</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4bgw|4bgw]], [[4bgx|4bgx]], [[4bgy|4bgy]], [[4bgz|4bgz]], [[4bh0|4bh0]], [[4bh1|4bh1]], [[4bh3|4bh3]], [[4bh4|4bh4]]</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=4bh2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4bh2 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4bh2 RCSB], [http://www.ebi.ac.uk/pdbsum/4bh2 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=4bh2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4bh2 OCA], [http://pdbe.org/4bh2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4bh2 RCSB], [http://www.ebi.ac.uk/pdbsum/4bh2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4bh2 ProSAT]</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 4bh2" style="background-color:#fffaf0;"></div>
 ==See Also==

4bh2

From Proteopedia

Revision as of 10:36, 5 August 2016

Crystal Structure of the Haemagglutinin from a Transmissible Mutant H5 Influenza Virus

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox