ID C0JRM0_9INFA Unreviewed; 560 AA. AC C0JRM0; DT 05-MAY-2009, integrated into UniProtKB/TrEMBL. DT 05-MAY-2009, sequence version 1. DT 21-SEP-2011, entry version 20. DE SubName: Full=Hemagglutinin; GN Name=HA; OS Influenza A virus (A/chicken/Anhui/AH16/2008(H9N2)). OC Viruses; ssRNA negative-strand viruses; Orthomyxoviridae; OC Influenzavirus A. OX NCBI_TaxID=572976; RN [1] RP NUCLEOTIDE SEQUENCE. RC STRAIN=A/chicken/Anhui/AH16/2008; RX PubMed=19781574; DOI=10.1016/j.jviromet.2009.09.013; RA Ji K., Jiang W.M., Liu S., Chen J.M., Chen J., Hou G.Y., Li J.P., RA Huang B.X.; RT "Characterization of the hemagglutinin gene of subtype H9 avian RT influenza viruses isolated in 2007-2009 in China."; RL J. Virol. Methods 163:186-189(2010). CC -!- FUNCTION: Binds to sialic acid-containing receptors on the cell CC surface, bringing about the attachment of the virus particle to CC the cell. This attachment induces virion internalization of about CC two third of the virus particles through clathrin-dependent CC endocytosis and about one third through a clathrin- and caveolin- CC independent pathway. Plays a major role in the determination of CC host range restriction and virulence. Class I viral fusion CC protein. Responsible for penetration of the virus into the cell CC cytoplasm by mediating the fusion of the membrane of the CC endocytosed virus particle with the endosomal membrane. Low pH in CC endosomes induces an irreversible conformational change in HA2, CC releasing the fusion hydrophobic peptide. Several trimers are CC required to form a competent fusion pore (By similarity). CC -!- SUBUNIT: Homotrimer of disulfide-linked HA1-HA2 (By similarity). CC -!- SIMILARITY: Belongs to the influenza viruses hemagglutinin family. CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; FJ434579; ACJ35235.1; -; Viral_cRNA. DR GO; GO:0020002; C:host cell plasma membrane; IEA:UniProtKB-KW. DR GO; GO:0016021; C:integral to membrane; IEA:UniProtKB-KW. DR GO; GO:0019031; C:viral envelope; IEA:InterPro. DR GO; GO:0046789; F:host cell surface receptor binding; IEA:InterPro. DR GO; GO:0019064; P:viral envelope fusion with host membrane; IEA:InterPro. DR InterPro; IPR008980; Capsid_hemagglutn. DR InterPro; IPR013828; Hemagglutn_HA1_a/b_dom. DR InterPro; IPR013827; Hemagglutn_HA1_b-rbn_dom. DR InterPro; IPR000149; Hemagglutn_influenz_A. DR InterPro; IPR001364; Hemagglutn_influenz_A/B. DR InterPro; IPR013829; Hemagglutn_stalk. DR Gene3D; G3DSA:3.90.209.20; Haemagglutn_HA1_a/b; 1. DR Gene3D; G3DSA:2.10.77.10; Haemagglutn_HA1_b-ribbon; 1. DR Gene3D; G3DSA:3.90.20.10; Haemagglutn_stalk; 1. DR Pfam; PF00509; Hemagglutinin; 1. DR PRINTS; PR00330; HEMAGGLUTN1. DR PRINTS; PR00329; HEMAGGLUTN12. DR SUPFAM; SSF49818; Capsid_hemag; 1. PE 3: Inferred from homology; KW Clathrin- and caveolin-independent endocytosis of virus by host; KW Hemagglutinin; Host cell membrane; Host membrane; KW Host-virus interaction; Membrane; Transmembrane; Transmembrane helix; KW Viral envelope protein; Virion; Virus endocytosis by host. SQ SEQUENCE 560 AA; 62675 MW; 76B576BF9412B81B CRC64; METVSLITML LVVTVINADK ICIGYQSTNS TETVDTLTEN NVPVTHAKEL LHTEHNGMLC ATNLGHPLIL DTCTIEGLIY GNPSCDLLLG GGEWSYIVER PSAVNGLCYP GNVENLEELR SLFSSASSYQ RIQIFPDTIW NVSYSGTSKA CSDSFYRSMR WLTQKNNAYP IQDAQYTNNR EKNILFMWGI NQPPTETAQT NLYTRTDTTT SVATEEINRT FKPLIGPRPL VNGLQGRIDY YWSVLKPGQT LRIRSNGNLI APWYGHILSG ESHGRILKTD LKRGSCTVQC QTEKGGLNTT LPFQNVSKYA FGNCSKYVGI KSLKLAVGLR NVPSRSSRGL FGAIAGFIEG GWSGLVAGWY GFQHSNDQGV GMAADRDSTQ KAIDKITSKV NNIVDKMNKQ YEIIDHEFSE VENRLNMINN KIDDQIQDIW AYNAELLVLL ENQKTLDEHD ANVNNLYNKV KRALGSNAVE DGKGCFELYH KCDDQCMETI RNGTYNRRKY QEESKLKRQR IEGVKLESEG TYKILTIYST VASSLVIAMG FAAFLFWAMS NGSCRCNICI //