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Influenza Virus Hemagglutinin Protein H1N1 Subtype Antigen (H1N1 HA)

Target: H1N1 HA
Molecular classification: Viral Protein, Glycoprotein, Surface Antigen

Overview

The hemagglutinin (HA) protein is a major surface glycoprotein of the influenza A virus, including the H1N1 subtype. It is an integral membrane protein and functions as both an attachment factor and a membrane fusion protein, making it essential for viral entry into host cells. HA is also the primary antigen recognized by the host immune system and is a key target for neutralizing antibodies and vaccine development. The H1N1 subtype has caused significant pandemics.

Other names: H1N1 HemagglutininHA H1N1H1N1 HA proteinHemagglutinin H1N1

Mechanism of action

Neutralization of viral entry by blocking receptor binding or membrane fusion

Biological functions

Receptor BindingMembrane FusionViral EntryAntigen presentationImmune stimulation

Disease associations

InfectionInfluenzaPandemicViral Disease

Safety considerations

Antigenic drift leading to vaccine mismatchPotential for antibody-dependent enhancement (ADE)Evolution of drug resistanceImmunogenicity concerns

Interacting drugs

Monoclonal Antibodies (e.g., against HA stem)

1 more in the full profile.

Biomarkers

HA antibody titersHA sequence variations

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