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Target intelligence / Profile preview
Hemagglutinin protein of Influenza A virus H1 subtype (HA)
- Target
- HA
- Molecular classification
- Glycoprotein, Viral protein, Surface antigen
01
Overview
Hemagglutinin (HA) is a surface glycoprotein on influenza A viruses, specifically the H1 subtype. It is crucial for viral entry into host cells, mediating receptor binding to sialic acid and membrane fusion. HA is a trimeric protein with a globular head domain for receptor binding and a stem domain for membrane fusion. As the primary target of neutralizing antibodies, HA's rapid evolution necessitates constant vaccine updates. The H1 subtype has been implicated in multiple influenza pandemics, including the 1918 Spanish flu, the 1977 Russian flu, and the 2009 swine-origin pandemic. Its cleavage site sequence and acid stability are key factors influencing pathogenicity and transmissibility.
- Other names
- H1 hemagglutininInfluenza A H1 HAHA protein
02
Mechanism of action
Neutralization of viral infectivity by blocking receptor binding or membrane fusion.
03
Biological functions
Receptor bindingMembrane fusionViral entryHost cell attachmentAntigen presentation
04
Disease associations
InfluenzaPandemic influenzaViral infection
05
Safety considerations
Antigenic drift (requiring frequent vaccine updates)Potential for antibody-dependent enhancement (ADE) of infectionRisk of vaccine-associated adverse events
06
Interacting drugs
Monoclonal antibodies (targeting HA)
1 more in the full profile.
07
Biomarkers
Antibody titers against HAHA sequence variations (for vaccine strain selection)
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