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Q9WCE3

- HEMA_I80A1

UniProt

Q9WCE3 - HEMA_I80A1

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Protein
Hemagglutinin
Gene
HA
Organism
Influenza A virus (strain A/Duck/Australia/749/1980 H1N1)
Status
Reviewed - Annotation score: 4 out of 5 - Experimental evidence at transcript leveli

Functioni

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.

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Sitei344 – 3452Cleavage; by host By similarity

GO - Biological processi

  1. clathrin-mediated endocytosis of virus by host cell Source: UniProtKB-KW
  2. fusion of virus membrane with host endosome membrane Source: UniProtKB-KW
  3. fusion of virus membrane with host plasma membrane Source: InterPro
  4. virion attachment to host cell Source: UniProtKB-KW
Complete GO annotation...

Keywords - Molecular functioni

Hemagglutinin

Keywords - Biological processi

Clathrin- and caveolin-independent endocytosis of virus by host, Clathrin-mediated endocytosis of virus by host, Fusion of virus membrane with host endosomal membrane, Fusion of virus membrane with host membrane, Host-virus interaction, Viral attachment to host cell, Viral penetration into host cytoplasm, Virus endocytosis by host, Virus entry into host cell

Names & Taxonomyi

Protein namesi
Recommended name:
Hemagglutinin
Cleaved into the following 2 chains:
Gene namesi
Name:HA
OrganismiInfluenza A virus (strain A/Duck/Australia/749/1980 H1N1)
Taxonomic identifieri383547 [NCBI]
Taxonomic lineageiVirusesssRNA negative-strand virusesOrthomyxoviridaeInfluenzavirus A
Virus hostiAves [TaxID: 8782]
Homo sapiens (Human) [TaxID: 9606]
Sus scrofa (Pig) [TaxID: 9823]

Subcellular locationi

Virion membrane; Single-pass type I membrane protein Reviewed prediction. Host apical cell membrane; Single-pass type I membrane protein
Note: Targeted to the apical plasma membrane in epithelial polarized cells through a signal present in the transmembrane domain. Associated with glycosphingolipid- and cholesterol-enriched detergent-resistant lipid rafts By similarity.

Topology

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Topological domaini18 – 529512Extracellular Reviewed prediction
Add
BLAST
Transmembranei530 – 55021Helical; Reviewed prediction
Add
BLAST
Topological domaini551 – 56616Cytoplasmic Reviewed prediction
Add
BLAST

GO - Cellular componenti

  1. host cell plasma membrane Source: UniProtKB-SubCell
  2. integral component of membrane Source: UniProtKB-KW
  3. viral envelope Source: UniProtKB-KW
  4. virion membrane Source: UniProtKB-SubCell
Complete GO annotation...

Keywords - Cellular componenti

Host cell membrane, Host membrane, Membrane, Viral envelope protein, Virion

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Signal peptidei1 – 1717 Reviewed prediction
Add
BLAST
Chaini18 – 343326Hemagglutinin HA1 chain
PRO_5000055165Add
BLAST
Chaini345 – 566222Hemagglutinin HA2 chain
PRO_5000055166Add
BLAST

Amino acid modifications

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Disulfide bondi21 ↔ 481Interchain (between HA1 and HA2 chains) By similarity
Glycosylationi27 – 271N-linked (GlcNAc...); by host Reviewed prediction
Glycosylationi28 – 281N-linked (GlcNAc...); by host Reviewed prediction
Glycosylationi40 – 401N-linked (GlcNAc...); by host Reviewed prediction
Disulfide bondi59 ↔ 292 By similarity
Disulfide bondi72 ↔ 84 By similarity
Glycosylationi104 – 1041N-linked (GlcNAc...); by host Reviewed prediction
Disulfide bondi107 ↔ 153 By similarity
Disulfide bondi296 ↔ 320 By similarity
Glycosylationi304 – 3041N-linked (GlcNAc...); by host Reviewed prediction
Disulfide bondi488 ↔ 492 By similarity
Glycosylationi498 – 4981N-linked (GlcNAc...); by host Reviewed prediction
Lipidationi555 – 5551S-palmitoyl cysteine; by host By similarity
Lipidationi562 – 5621S-palmitoyl cysteine; by host By similarity
Lipidationi565 – 5651S-palmitoyl cysteine; by host By similarity

Post-translational modificationi

In natural infection, inactive HA is matured into HA1 and HA2 outside the cell by one or more trypsin-like, arginine-specific endoprotease secreted by the bronchial epithelial cells. One identified protease that may be involved in this process is secreted in lungs by Clara cells By similarity.
Palmitoylated By similarity.

Keywords - PTMi

Disulfide bond, Glycoprotein, Lipoprotein, Palmitate

Interactioni

Subunit structurei

Homotrimer of disulfide-linked HA1-HA2 By similarity.

Structurei

3D structure databases

ProteinModelPortaliQ9WCE3.
SMRiQ9WCE3. Positions 18-519.

Family & Domainsi

Sequence similaritiesi

Keywords - Domaini

Signal, Transmembrane, Transmembrane helix

Family and domain databases

Gene3Di2.10.77.10. 1 hit.
3.90.20.10. 1 hit.
3.90.209.20. 1 hit.
InterProiIPR008980. Capsid_hemagglutn.
IPR013828. Hemagglutn_HA1_a/b_dom.
IPR013827. Hemagglutn_HA1_b-rbn_dom.
IPR000149. Hemagglutn_influenz_A.
IPR001364. Hemagglutn_influenz_A/B.
IPR013829. Hemagglutn_stalk.
[Graphical view]
PfamiPF00509. Hemagglutinin. 1 hit.
[Graphical view]
PRINTSiPR00330. HEMAGGLUTN1.
PR00329. HEMAGGLUTN12.
SUPFAMiSSF49818. SSF49818. 1 hit.

Sequencei

Sequence statusi: Complete.

Sequence processingi: The displayed sequence is further processed into a mature form.

Q9WCE3-1 [UniParc]FASTAAdd to Basket

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MEAKLLVLFC TFAALKADTI CIGYHANNST DTVDTVLEKN VTVTHSVNLL    50
ENSHNGKLCS LNGIAPLQLG KCNVAGWLLG NLECDLLLTA NSWSYIIETS 100
NSENGTCYPG EFIDYEELRE QLSSVSSFEK FEIFPKASSW PNHETTKGVT 150
AACSYLGASS FYRNLLWMTK KGTSYPKLSK SYTNNKGKEV LVLWGVHHPP 200
TTSEQQTLYQ NVDAYVSVGS SKYNRRFTPE IAARPKVRGQ AGKMNYYWTL 250
LDQGDTITFE ATGNLIAPWY AFALNKGSDS GIITSDAPVH NCDTKCQTPY 300
GALNSSLPFQ NVHPITIGEC PKYVKSTKLR MATGLRNVPS IQSRGLFGAI 350
AGFIEGGWTG MIDGWYGYHH QNEQGSGYAA DQKSTQSAID GITNKVNSVI 400
EKMNTQFTAV GKEFNNLERR IENLNKKVDD GFLDVWTYNA ELLVLLENER 450
TLDFHDSNVR NLYEKVKSQL RNNAKEIGNG CFEFYHKCDD ECMESVKNGT 500
YDYPKYSEES KLNREEIDGV KLESMGVYQI LAIYSTVASS LVLLVSLGAV 550
SFWMCSNGSL QCRICI 566
Length:566
Mass (Da):63,009
Last modified:November 1, 1999 - v1
Checksum:iEEA7D23C5B0FFB31
GO

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
AF091312 mRNA. Translation: AAD25307.1.
U47309 mRNA. Translation: AAB52909.1.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
AF091312 mRNA. Translation: AAD25307.1 .
U47309 mRNA. Translation: AAB52909.1 .

3D structure databases

ProteinModelPortali Q9WCE3.
SMRi Q9WCE3. Positions 18-519.
ModBasei Search...
MobiDBi Search...

Protocols and materials databases

Structural Biology Knowledgebase Search...

Family and domain databases

Gene3Di 2.10.77.10. 1 hit.
3.90.20.10. 1 hit.
3.90.209.20. 1 hit.
InterProi IPR008980. Capsid_hemagglutn.
IPR013828. Hemagglutn_HA1_a/b_dom.
IPR013827. Hemagglutn_HA1_b-rbn_dom.
IPR000149. Hemagglutn_influenz_A.
IPR001364. Hemagglutn_influenz_A/B.
IPR013829. Hemagglutn_stalk.
[Graphical view ]
Pfami PF00509. Hemagglutinin. 1 hit.
[Graphical view ]
PRINTSi PR00330. HEMAGGLUTN1.
PR00329. HEMAGGLUTN12.
SUPFAMi SSF49818. SSF49818. 1 hit.
ProtoNeti Search...

Publicationsi

  1. "Molecular basis for the generation in pigs of influenza A viruses with pandemic potential."
    Ito T., Couceiro J.N., Kelm S., Baum L.G., Krauss S., Castrucci M.R., Donatelli I., Kida H., Paulson J.C., Webster R.G., Kawaoka Y.
    J. Virol. 72:7367-7373(1998) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [MRNA].
  2. "Emergence of avian H1N1 influenza viruses in pigs in China."
    Guan Y., Shortridge K.F., Krauss S., Li P.H., Kawaoka Y., Webster R.G.
    J. Virol. 70:8041-8046(1996) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [MRNA] OF 18-344.

Entry informationi

Entry nameiHEMA_I80A1
AccessioniPrimary (citable) accession number: Q9WCE3
Secondary accession number(s): O09651
Entry historyi
Integrated into UniProtKB/Swiss-Prot: March 6, 2007
Last sequence update: November 1, 1999
Last modified: February 19, 2014
This is version 78 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programViral Protein Annotation Program

Miscellaneousi

Miscellaneous

Major glycoprotein, comprises over 80% of the envelope proteins present in virus particle.
The extent of infection into host organism is determined by HA. Influenza viruses bud from the apical surface of polarized epithelial cells (e.g. bronchial epithelial cells) into lumen of lungs and are therefore usually pneumotropic. The reason is that HA is cleaved by tryptase clara which is restricted to lungs. However, HAs of H5 and H7 pantropic avian viruses subtypes can be cleaved by furin and subtilisin-type enzymes, allowing the virus to grow in other organs than lungs.
The influenza A genome consist of 8 RNA segments. Genetic variation of hemagglutinin and/or neuraminidase genes results in the emergence of new influenza strains. The mechanism of variation can be the result of point mutations or the result of genetic reassortment between segments of two different strains.

Documents

  1. SIMILARITY comments
    Index of protein domains and families

External Data

Dasty 3

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