Target intelligence / Profile preview

Hemagglutinin Protein of Influenza A Virus (H3N2) (HA (H3N2))

Target
HA (H3N2)
Molecular classification
Glycoprotein, Viral protein, Surface antigen
01

Overview

Hemagglutinin (HA) is a major antigenic glycoprotein found on the surface of influenza A viruses, including the H3N2 subtype. It plays a central role in viral infectivity and immune recognition. HA binds to sialic acid-containing receptors on host cell surfaces, determining host specificity and initiating infection. After endocytosis into the host cell, acidic pH in endosomes triggers conformational changes in HA that mediate fusion between viral and cellular membranes, allowing release of the viral genome into the cytoplasm. HA is the primary target for neutralizing antibodies. Its antigenic variability underlies both seasonal epidemics (antigenic drift) and pandemics (antigenic shift).

Other names
H3N2 HemagglutininHAInfluenza A HemagglutininHA1 subunitHA2 subunit
02

Mechanism of action

Inhibition of receptor binding; disruption of membrane fusion

03

Biological functions

Receptor bindingMembrane fusionAntigen presentationViral entry
04

Disease associations

InfectionInfluenzaSeasonal epidemicsPandemics
05

Safety considerations

Antigenic driftAntigenic shiftImmune escape
06

Interacting drugs

NA

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