Neuraminidase (G4 Eurasian avian-like H1N1) (NA)

The G4 Eurasian avian-like (EA) H1N1 neuraminidase is a critical surface glycoprotein and enzyme found on a specific lineage of swine influenza viruses that emerged as a major public health concern due to its pandemic potential [1]. As a sialidase, its primary biological function is to cleave terminal sialic acid residues from host cell receptors, a process essential for the release of newly formed viral particles from infected cells and the prevention of viral self-aggregation [3]. This protein also serves as a key antigen for the host immune response, although its high evolutionary plasticity allows the virus to frequently evade antibody neutralization [1, 4]. In the context of therapeutic intervention, the neuraminidase is the primary target for antiviral drugs known as neuraminidase inhibitors (NAIs), including oseltamivir and zanamivir, which block the enzyme's active site to halt viral replication [2]. The G4 genotype is particularly notable because it possesses the internal genes of the 2009 H1N1 pandemic virus, which may enhance its ability to infect humans and transmit efficiently [1]. Monitoring this target is vital for pandemic preparedness, especially regarding the detection of resistance-associated mutations like H275Y that can compromise the effectiveness of frontline antiviral treatments [4]. Sources: [1] Sun, H., et al. (2020). Prevalent Eurasian avian-like H1N1 swine influenza virus with 2009 pandemic viral genes facilitating human infection. PNAS. [2] World Health Organization (WHO). Influenza (Avian and other zoonotic) Fact Sheets. [3] UniProt Consortium. Neuraminidase (Influenza A virus) Protein Entry. [4] Centers for Disease Control and Prevention (CDC). Information on G4 EA H1N1 Swine Influenza Viruses.

Other names

G4 EA H1N1 neuraminidaseSialidaseN1 neuraminidaseExo-alpha-sialidaseG4 neuraminidase antigen

Neuraminidase inhibitors act by binding to the highly conserved active site of the neuraminidase enzyme, 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 inhibits further viral spread.