Influenza A virus neuraminidase (subtype H5N1) (NA (for neuraminidase); H5N1 NA (for specificity))

Influenza A virus neuraminidase (specifically subtype N1 in H5N1) is a tetrameric enzyme present on the surface of influenza virions. It plays a critical role in the influenza lifecycle by cleaving terminal sialic acid residues from host cell glycoproteins and glycolipids, facilitating the release of newly formed viral particles and preventing aggregation at the cell surface. Its catalytic domain forms a six-bladed beta-propeller and is a well-validated target for antiviral drugs, including oseltamivir and zanamivir. NA is also increasingly targeted by monoclonal antibodies and next-generation vaccines, especially in pandemic strains such as H5N1, where it contributes directly to viral pathogenicity and transmissibility. The molecule's structural instability, antigenic variability, and rapid mutation rate pose challenges for antiviral and vaccine development, and monitoring NA activity and inhibitor resistance is central to influenza surveillance and treatment strategies

Other names

Neuraminidase (N1)Influenza virus neuraminidaseSialidaseN1 neuraminidase

Competitive inhibition of the active site, preventing the cleavage of sialic acid on host cell surfaces and thus impeding viral release and spread