Neuraminidase (Influenza A virus) (NA)

Neuraminidase (NA) is an essential surface glycoprotein found on the influenza A virus that functions as a sialidase enzyme. Its primary biological role is to cleave terminal sialic acid residues from host cell receptors and viral glycoproteins, a process required for the release of newly formed progeny virions from infected cells and the prevention of viral self-aggregation. By facilitating the movement of the virus through the mucus of the respiratory tract, NA plays a critical role in the spread of infection within the host. (Source: UniProt P03468; NIH/NCBI). In the context of drug development, NA is the primary target for neuraminidase inhibitors (NAIs) such as oseltamivir and zanamivir. These small molecules act as transition-state analogs that bind to the highly conserved active site of the enzyme, effectively blocking its catalytic activity and limiting the infection to a single cycle of replication. While highly effective, the target is prone to rapid evolution, leading to the emergence of resistant strains that pose significant challenges for pandemic preparedness and clinical management. The term 'neuraminidase-like' is sometimes specifically used to describe the proteins found in bat-derived influenza viruses (N10 and N11), which possess a similar scaffold but may lack traditional sialidase activity, representing an area of ongoing virological research. (Source: PubMed PMC4054015; Wikipedia).

Other names

SialidaseExo-alpha-sialidaseInfluenza A virus NANeuraminidase-like proteinN1-N11 subtypes

Competitive inhibition of the neuraminidase active site, preventing the cleavage of terminal sialic acid residues on host cell receptors and viral glycoproteins, which traps progeny virions at the host cell surface and halts viral spread.