Influenza A virus Neuraminidase N3 (NA N3)

Influenza A virus Neuraminidase N3 is a surface glycoprotein essential for the life cycle of the influenza virus, primarily found in avian influenza strains. As a glycosyl hydrolase, its primary biological function is to cleave terminal sialic acid residues from host cell receptors and newly synthesized viral hemagglutinin, which facilitates the release of progeny virions from infected cells and prevents their self-aggregation. This enzymatic activity is also crucial for the virus to navigate through the respiratory mucus layer to reach target epithelial cells (Source: UniProt, P06755; Wikipedia, Influenza neuraminidase). In the context of human health, while N3 is predominantly associated with avian species, it represents a potential zoonotic threat and a target for pandemic preparedness. Therapeutic intervention typically involves Neuraminidase Inhibitors (NAIs) such as oseltamivir and zanamivir, which occupy the enzyme's active site to block viral dissemination. Monitoring the N3 subtype is vital for detecting emerging resistance mutations that could render standard antiviral treatments ineffective during an outbreak (Source: CDC, Influenza Antiviral Drug Resistance; PubMed, PMID: 24503064).

Other names

Neuraminidase subtype N3Exo-alpha-sialidase N3Sialidase N3NA N3Neuraminidase protein N3

Neuraminidase inhibitors act as competitive analogues of sialic acid, binding to the highly conserved active site of the neuraminidase enzyme. This prevents the enzyme from cleaving terminal sialic acid residues on host cell surfaces and viral glycoproteins, thereby trapping newly formed virions on the surface of the infected cell and preventing the spread of the infection to neighboring cells (Source: PubMed, PMID: 22230256; StatPearls, NBK539909).