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Target intelligence / Profile preview
Influenza A virus hemagglutinin protein subtype H5 (H5 HA)
- Target
- H5 HA
- Molecular classification
- Glycoprotein, Viral protein, Surface antigen, Fusion protein
01
Overview
The Influenza A H5 hemagglutinin (HA) protein is a surface glycoprotein essential for the infectivity and host specificity of influenza viruses, particularly those of the H5 subtype. It mediates viral attachment to host cells via sialic acid binding and triggers membrane fusion, enabling viral entry. It is a major target for neutralizing antibodies, but is subject to antigenic drift, which poses challenges for vaccine development. The amino acid sequence at the HA1/HA2 cleavage site influences pathogenicity.
- Other names
- H5 hemagglutininHAHemagglutininH5N1 hemagglutinin
02
Mechanism of action
Neutralizing antibodies bind to hemagglutinin, blocking receptor binding and/or membrane fusion.
03
Biological functions
Receptor bindingMembrane fusionViral entryImmune evasion
04
Disease associations
InfectionInfluenzaAvian influenzaPandemic potential
05
Safety considerations
Antigenic driftStrain-specific immunityPotential for increased virulence
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