4we4 | pdb_00004we4

The crystal structure of hemagglutinin from 1968 H3N2 influenza virus

spinqualitylabelsall models 4we4, resolution 2.35Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4we4 is a 2 chain structure with sequence from Influenza A virus (A/Hong Kong/1/1968(H3N2)). Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.351Å Ligands: BMA, MAN, NAG, PE5, PEG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function HEMA_I68A4 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). Publication Abstract from PubMed A(H3N2) influenza viruses have circulated in humans since 1968, and antigenic drift of the hemagglutinin (HA) protein continues to be a driving force that allows the virus to escape the human immune response. Since the major antigenic sites of the HA overlap into the receptor binding site (RBS) of the molecule, the virus constantly struggles to effectively adapt to host immune responses, without compromising its functionality. Here, we have structurally assessed the evolution of the A(H3N2) virus HA RBS, using an established recombinant expression system. Glycan binding specificities of nineteen A(H3N2) influenza virus HAs, each a component of the seasonal influenza vaccine between 1968 and 2012, were analyzed. Results suggest that while its receptor-binding site has evolved from one that can bind a broad range of human receptor analogs to one with a more restricted binding profile for longer glycans, the virus continues to circulate and transmit efficiently among humans. Structure and receptor binding preferences of recombinant human A(H3N2) virus hemagglutinins.,Yang H, Carney PJ, Chang JC, Guo Z, Villanueva JM, Stevens J Virology. 2015 Jan 21;477C:18-31. doi: 10.1016/j.virol.2014.12.024. PMID:25617824 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Hemagglutinin 3D structures

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