ID   HEMA_INBVM              Reviewed;         362 AA.
AC   Q67381;
DT   07-DEC-2004, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1996, sequence version 1.
DT   25-MAY-2022, entry version 94.
DE   RecName: Full=Hemagglutinin;
DE   Contains:
DE     RecName: Full=Hemagglutinin HA1 chain;
DE   Flags: Precursor; Fragment;
GN   Name=HA;
OS   Influenza B virus (strain B/Victoria/19/1989).
OC   Viruses; Riboviria; Orthornavirae; Negarnaviricota; Polyploviricotina;
OC   Insthoviricetes; Articulavirales; Orthomyxoviridae; Betainfluenzavirus.
OX   NCBI_TaxID=291804;
OH   NCBI_TaxID=9606; Homo sapiens (Human).
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC RNA].
RX   PubMed=1402807; DOI=10.1099/0022-1317-73-10-2737;
RA   Rota P.A., Hemphill M., Whistler T., Regnery H.L., Kendal A.P.;
RT   "Antigenic and genetic characterization of the haemagglutinins of recent
RT   cocirculating strains of influenza B virus.";
RL   J. Gen. Virol. 73:2737-2742(1992).
CC   -!- FUNCTION: Binds to sialic acid-containing receptors on the cell
CC       surface, bringing about the attachment of the virus particle to the
CC       cell. Plays a major role in the determination of host range restriction
CC       and virulence. Class I viral fusion protein. Responsible for
CC       penetration of the virus into the cell cytoplasm by mediating the
CC       fusion of the membrane of the endocytosed virus particle with the
CC       endosomal membrane. Low pH in endosomes induce an irreversible
CC       conformational change in HA2, releasing the fusion hydrophobic peptide.
CC       Several trimers are required to form a competent fusion pore.
CC   -!- SUBUNIT: Homotrimer of disulfide-linked HA1-HA2.
CC   -!- SUBCELLULAR LOCATION: Virion membrane {ECO:0000305}; Single-pass type I
CC       membrane protein {ECO:0000305}. Host apical cell membrane; Single-pass
CC       type I membrane protein. Note=Targeted to the apical plasma membrane in
CC       epithelial polarized cells through a signal present in the
CC       transmembrane domain. Associated with glycosphingolipid- and
CC       cholesterol-enriched detergent-resistant lipid rafts.
CC   -!- PTM: In natural infection, inactive HA is matured into HA1 and HA2
CC       outside the cell by one or more trypsin-like, arginine-specific
CC       endoprotease secreted by the bronchial epithelial cells. One identified
CC       protease that may be involved in this process is secreted in lungs by
CC       Clara cells (By similarity). {ECO:0000250}.
CC   -!- PTM: Palmitoylated. {ECO:0000250}.
CC   -!- MISCELLANEOUS: Major glycoprotein, comprises over 80% of the envelope
CC       proteins present in virus particle.
CC   -!- MISCELLANEOUS: The extent of infection into host organism is determined
CC       by HA. Influenza viruses bud from the apical surface of polarized
CC       epithelial cells (e.g. bronchial epithelial cells) into lumen of lungs
CC       and are therefore usually pneumotropic. The reason is that HA is
CC       cleaved by tryptase clara which is restricted to lungs. However, HAs of
CC       H5 and H7 pantropic avian viruses subtypes can be cleaved by furin and
CC       subtilisin-type enzymes, allowing the virus to grow in other organs
CC       than lungs.
CC   -!- MISCELLANEOUS: The influenza B genome consist of 8 RNA segments.
CC       Genetic variation of hemagglutinin and/or neuraminidase genes results
CC       in the emergence of new influenza strains. The mechanism of variation
CC       can be the result of point mutations or the result of genetic
CC       reassortment between segments of two different strains.
CC   -!- SIMILARITY: Belongs to the influenza viruses hemagglutinin family.
CC       {ECO:0000305}.
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DR   EMBL; M65177; AAA43715.1; -; Genomic_RNA.
DR   PIR; JQ1905; JQ1905.
DR   SMR; Q67381; -.
DR   GO; GO:0020002; C:host cell plasma membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0019031; C:viral envelope; IEA:UniProtKB-KW.
DR   GO; GO:0055036; C:virion membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0046789; F:host cell surface receptor binding; IEA:InterPro.
DR   GO; GO:0039654; P:fusion of virus membrane with host endosome membrane; IEA:UniProtKB-KW.
DR   GO; GO:0019064; P:fusion of virus membrane with host plasma membrane; IEA:InterPro.
DR   GO; GO:0046718; P:viral entry into host cell; IEA:UniProtKB-KW.
DR   GO; GO:0019062; P:virion attachment to host cell; IEA:UniProtKB-KW.
DR   Gene3D; 3.90.209.20; -; 1.
DR   InterPro; IPR008980; Capsid_hemagglutn.
DR   InterPro; IPR013828; Hemagglutn_HA1_a/b_dom_sf.
DR   InterPro; IPR001364; Hemagglutn_influenz_A/B.
DR   Pfam; PF00509; Hemagglutinin; 1.
DR   SUPFAM; SSF49818; SSF49818; 1.
PE   3: Inferred from homology;
KW   Disulfide bond; Fusion of virus membrane with host endosomal membrane;
KW   Fusion of virus membrane with host membrane; Glycoprotein; Hemagglutinin;
KW   Host cell membrane; Host membrane; Host-virus interaction; Lipoprotein;
KW   Membrane; Palmitate; Signal; Transmembrane; Viral attachment to host cell;
KW   Viral envelope protein; Viral penetration into host cytoplasm; Virion;
KW   Virus entry into host cell.
FT   SIGNAL          1..15
FT                   /evidence="ECO:0000255"
FT   CHAIN           16..362
FT                   /note="Hemagglutinin HA1 chain"
FT                   /evidence="ECO:0000250"
FT                   /id="PRO_0000039140"
FT   CARBOHYD        40
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255"
FT   CARBOHYD        74
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255"
FT   CARBOHYD        160
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255"
FT   CARBOHYD        181
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255"
FT   CARBOHYD        319
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255"
FT   CARBOHYD        348
FT                   /note="N-linked (GlcNAc...) asparagine; by host"
FT                   /evidence="ECO:0000255"
FT   NON_TER         362
SQ   SEQUENCE   362 AA;  39165 MW;  F9512FE443581026 CRC64;
     MKAIIVLLMV VTSNADRICT GITSSNSPHV VKTATQGEVN VTGVIPLTTT PTKSHFANLK
     GTKTRGKLCP KCLNCTDLDV ALARPKCTGT IPSAKASILH EVKPVTFGCF PIMHDRTKIR
     QLPNLLRGYE HIRLSTHNVI NAEKAPGGPY KIGTSGSCPN VTNGNGFFAT MAWAVPKNDN
     NKTATNSLTV EVPYICTEGE DQITVWGFHS DNEIQMVKLY GDSKPQKFTS SANGVTTHYV
     SQIGGFPNQA EDGGLPQSGR IVVDYMVQKS GKTGTITYQR GILLPQKVWC ASGRSKVIKG
     SLPLIGEADC LHEKYGGLNK SKPYYTGEHA KAIGNCPIWV KTPLKLANGT KYRPPAKLLK
     ER