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Protein

Hemagglutinin

Gene

HA

Organism
Influenza A virus (A/Taiwan/0095/1996(H3N2))
Status
Unreviewed-Annotation score: Annotation score: 3 out of 5-Experimental evidence at protein 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 either through clathrin-dependent endocytosis or through 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.SAAS annotation
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.UniRule annotation

GO - Molecular functioni

GO - Biological processi

Keywordsi

Molecular functionHemagglutininUniRule annotationSAAS annotation
Biological processClathrin- and caveolin-independent endocytosis of virus by hostSAAS annotation, Clathrin-mediated endocytosis of virus by hostSAAS annotation, Fusion of virus membrane with host endosomal membraneSAAS annotation, Fusion of virus membrane with host membrane, Host-virus interaction, Viral attachment to host cellSAAS annotation, Viral penetration into host cytoplasm, Virus endocytosis by host, Virus entry into host cell

Names & Taxonomyi

Protein namesi
Recommended name:
HemagglutininSAAS annotation
Gene namesi
Name:HAImported
OrganismiInfluenza A virus (A/Taiwan/0095/1996(H3N2))Imported
Taxonomic identifieri162497 [NCBI]
Taxonomic lineageiVirusesssRNA virusesssRNA negative-strand virusesOrthomyxoviridaeInfluenzavirus A

Subcellular locationi

  • Host apical cell membrane SAAS annotation; Single-pass type I membrane protein SAAS annotation
  • Virion membrane SAAS annotation; Single-pass type I membrane protein SAAS annotation

GO - Cellular componenti

Keywords - Cellular componenti

Host cell membraneSAAS annotation, Host membrane, Membrane, Viral envelope proteinUniRule annotationSAAS annotation, Virion

PTM / Processingi

Keywords - PTMi

Disulfide bondSAAS annotation

Interactioni

Subunit structurei

Homotrimer of disulfide-linked HA1-HA2.UniRule annotationSAAS annotation

GO - Molecular functioni

Structurei

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
2OJEX-ray3.00C/G260-272[»]
ProteinModelPortaliQ91LS8.
SMRiQ91LS8.
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiQ91LS8.

Family & Domainsi

Sequence similaritiesi

Belongs to the influenza viruses hemagglutinin family.UniRule annotationSAAS annotation

Keywords - Domaini

Transmembrane, Transmembrane helixSAAS annotation

Family and domain databases

Gene3Di3.90.209.20. 1 hit.
InterProiView protein in InterPro
IPR008980. Capsid_hemagglutn.
IPR013828. Hemagglutn_HA1_a/b_dom.
IPR000149. Hemagglutn_influenz_A.
IPR001364. Hemagglutn_influenz_A/B.
PfamiView protein in Pfam
PF00509. Hemagglutinin. 1 hit.
PRINTSiPR00330. HEMAGGLUTN1.
PR00329. HEMAGGLUTN12.
SUPFAMiSSF49818. SSF49818. 1 hit.

Sequencei

Sequence statusi: Fragment.

Q91LS8-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
STGRICDSPH RILDGKNCTL IDALLGDPHC DGFQNKEWDL FVERSKAYSN
60 70 80 90 100
CYPYDVPDYA SLRSLVASSG TLEFTNEGFN WTGVAQNGTS YACKRGSVKS
110 120 130 140 150
FFSRLNWLHK LEYKYPALNV TMPNNDKFDK LYIWGVHHPS TDSDQTSLYV
160 170 180 190 200
QASGRITVST KRSQQTVIPN IGSRPWVRGV SSIISIYWTI VKPGDILLIN
210 220 230 240 250
STGNLIAPRG YFKIRSGKSS IMRSDAPIGN CNSECITPNG SIPNDKPFQN
260 270 280
VNRITYGACP KYVKQNTLKL ATGMRNVPEK Q
Length:281
Mass (Da):31,362
Last modified:December 1, 2001 - v1
Checksum:i63B306D7AD351E2D
GO

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Non-terminal residuei1Imported1
Non-terminal residuei281Imported1

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AF362820 mRNA. Translation: AAK82869.1.

Similar proteinsi

Entry informationi

Entry nameiQ91LS8_9INFA
AccessioniPrimary (citable) accession number: Q91LS8
Entry historyiIntegrated into UniProtKB/TrEMBL: December 1, 2001
Last sequence update: December 1, 2001
Last modified: August 30, 2017
This is version 100 of the entry and version 1 of the sequence. See complete history.
Entry statusiUnreviewed (UniProtKB/TrEMBL)

Miscellaneousi

Keywords - Technical termi

3D-structureCombined sources