Target intelligence / Profile preview

Influenza A Hemagglutinin Protein (H5) (HA H5)

Target: HA H5
Molecular classification: Glycoprotein, Viral Surface Protein, Receptor

Overview

The hemagglutinin (HA) protein, specifically the H5 subtype, is a surface glycoprotein of the influenza A virus. It is essential for viral entry into host cells, mediating attachment to sialic acid receptors and facilitating membrane fusion. H5 is characteristic of avian influenza viruses and can adapt to infect mammals through mutations affecting receptor specificity, posing a significant pandemic threat. It's a key target for vaccine and antiviral development.

Other names: H5 HemagglutininHA protein H5 subtypeH5N1 Hemagglutinin

Mechanism of action

Binds to sialic acid receptors on host cells, initiating viral entry via endocytosis and subsequent membrane fusion.

Biological functions

Viral entryReceptor bindingMembrane fusionHost cell attachment

Disease associations

InfectionInfluenzaAvian Influenza (H5N1)Pandemic Potential

Safety considerations

Antigenic drift and shift leading to vaccine escapePotential for zoonotic transmission and pandemic emergenceResistance to antiviral drugs that indirectly target HA functionRisk of antibody-dependent enhancement (ADE)

Interacting drugs

NA inhibitors (e.g., Oseltamivir, Zanamivir) - indirectly affect HA function

1 more in the full profile.

Biomarkers

HA antibody titers (vaccine efficacy)HA sequence variations (antigenic drift/shift)HA receptor binding specificity (host range)

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