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Target intelligence / Profile preview
Hemagglutinin Protein of Influenza A H1N1 Virus (HA)
- Target
- HA
- Molecular classification
- Glycoprotein, Viral Fusion Protein, Type I transmembrane protein
01
Overview
The hemagglutinin protein of influenza A H1N1 virus is a trimeric class I viral fusion glycoprotein that enables attachment to sialylated receptors on host cells via its variable head domain, followed by pH-triggered conformational change leading to membrane fusion through its conserved stem region. Its structure-function relationship underlies both immune recognition/escape mechanisms and cross-species transmission potential—making it central to influenza pathogenesis, epidemiology, vaccine design, and antiviral targeting.
- Other names
- H1N1 HemagglutininHA ProteinInfluenza A HemagglutininHA0HA1HA2
02
Mechanism of action
Inhibition of HA-mediated membrane fusion or receptor binding, prevention of viral release from cells (neuraminidase inhibitors interfere with the activity of neuraminidase, a protein also present on the surface of influenza viruses)
03
Biological functions
Receptor bindingMembrane fusionViral entryHost cell recognitionAntigen presentation
04
Disease associations
InfectionInfluenzaPandemicAcute Respiratory Distress Syndrome (ARDS)
05
Safety considerations
Antigenic drift and shift leading to vaccine mismatchDevelopment of drug resistancePotential for zoonotic transmissionImmune evasionAntibody-dependent enhancement (ADE)
06
Interacting drugs
Oseltamivir
5 more in the full profile.
07
Biomarkers
HA antibody titers (IgG, IgM, IgA)HA sequence variations (antigenic drift)HA glycosylation patternsViral load
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