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Target intelligence / Profile preview
Influenza Virus Hemagglutinin Protein H3N2 Subtype Antigen (HA H3N2)
- Target
- HA H3N2
- Molecular classification
- Viral protein, Glycoprotein, Surface antigen
01
Overview
The hemagglutinin protein from Influenza A virus subtype H3N2 is an essential trimeric surface glycoprotein responsible for both attaching the virus to sialic acid-containing receptors on host cells and mediating subsequent membrane fusion required for infection. Its structure includes highly variable regions that allow immune evasion through antigenic drift—a process central to ongoing challenges with vaccine efficacy against this rapidly evolving pathogen. As such, it remains a principal focus for surveillance efforts and immunization strategies worldwide.
- Other names
- H3N2 HemagglutininHA protein (H3N2)H3N2 HA
02
Mechanism of action
Neutralization of viral attachment and entry, inhibition of membrane fusion
03
Biological functions
Receptor bindingMembrane fusionViral entryImmune evasionAntigen presentation
04
Disease associations
InfluenzaAcute respiratory infection
05
Safety considerations
Antigenic drift and shiftPotential for vaccine mismatchImmune escape mutantsReassortment with other influenza subtypes
06
Interacting drugs
Influenza vaccines (targeting HA)
1 more in the full profile.
07
Biomarkers
HA antibody titers (vaccine efficacy)HA sequence variants (antigenic drift)HA expression levels (viral load)
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