Target intelligence / Profile preview

Hemagglutinin Antigen of Influenza A Virus Subtype H3N2 (HA (H3N2))

Target
HA (H3N2)
Molecular classification
Viral protein, Glycoprotein, Lectin, Membrane protein
01

Overview

Hemagglutinin (HA) is a major surface glycoprotein and antigen of the Influenza A virus, specifically the H3N2 subtype. It mediates viral attachment to host cells via sialic acid binding and facilitates membrane fusion for viral entry. HA is a homotrimeric protein composed of HA1 and HA2 subunits, and undergoes continuous antigenic drift, making it a primary target for neutralizing antibodies and a key component of seasonal influenza vaccines. Recombinant forms are used in serological assays and vaccine development, updated annually to reflect circulating strains.

Other names
H3N2 HemagglutininHA protein (H3N2)Influenza A H3N2 Hemagglutinin
02

Mechanism of action

Neutralization via antibody binding to prevent viral entry

03

Biological functions

Viral attachment to host cellsMembrane fusionReceptor binding (sialic acid)Antigen presentationImmune response elicitation
04

Disease associations

Influenza A infectionRespiratory illnessPandemic (historical)Seasonal influenza
05

Safety considerations

Antigenic drift leading to vaccine mismatchPotential for reassortment with other influenza strainsImmunogenicity varies between strains and individuals
06

Biomarkers

Antibody titers against HA (H3N2)HA sequence variants for strain identification

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