Influenza A virus protein epitopes

Influenza A virus protein epitopes are the specific biochemical regions on viral proteins recognized by the host immune system, serving as primary targets for vaccines and therapeutic antibodies. These epitopes are located on major surface proteins, including Hemagglutinin (HA), Neuraminidase (NA), and the Matrix 2 (M2) ion channel. HA epitopes are subdivided into the immunodominant globular head, which mediates attachment to host sialic acid receptors, and the highly conserved stalk region, which is essential for membrane fusion and is the primary target for broadly neutralizing antibodies (bnAbs). NA epitopes, including those at the enzymatic active site and the recently discovered "dark side" on the protein underside, facilitate the release of new viral particles from the host cell. The M2e epitope is a small, highly conserved extracellular domain that is a major focus for universal vaccine development. Therapeutics targeting these epitopes aim to neutralize viral entry or exit, providing protection against seasonal drift and pandemic shift.

Other names

Influenza A antigensViral antigenic sitesHemagglutinin epitopesNeuraminidase epitopesM2e epitopesUniversal flu targets

Inhibition of viral attachment through receptor-binding site (RBS) blocking, inhibition of viral-host membrane fusion by preventing HA conformational changes, and inhibition of viral release via neuraminidase blockade or Fc-mediated effector functions like ADCC.