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Target intelligence / Profile preview
Influenza A (H1N1) Hemagglutinin (HA (H1N1))
- Target
- HA (H1N1)
- Molecular classification
- Type I transmembrane glycoprotein, Viral surface protein, Receptor
01
Overview
The hemagglutinin (HA) antigen of Influenza A (H1N1) is a surface glycoprotein and the principal antigenic determinant of the influenza virus. It plays a central role in viral infectivity, host specificity, and immune recognition. HA binds sialic acid-containing receptors on host cell surfaces, initiating infection, and mediates membrane fusion for viral entry. Frequent mutations in HA lead to new variants requiring regular updates to seasonal influenza vaccines.
- Other names
- H1N1 HemagglutininHAHemagglutinin
02
Mechanism of action
Neutralization of viral infectivity by blocking receptor binding or membrane fusion.
03
Biological functions
Receptor bindingMembrane fusionViral entryImmune recognition
04
Disease associations
InfectionInfluenzaPandemicViral disease
05
Safety considerations
Antigenic drift (leading to vaccine failure)Potential for pandemic emergenceImmune escape
06
Interacting drugs
NA inhibitors (e.g., Oseltamivir, Zanamivir) - indirectly
1 more in the full profile.
07
Biomarkers
HA antibody titers (for vaccine efficacy)HA sequence variation (for predicting antigenic drift)
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