Influenza hemagglutinin-neuraminidase

The submitted target name "Influenza hemagglutinin-neuraminidase" is a combination of two distinct influenza virus surface glycoproteins, each with different structure and function: **hemagglutinin (HA)** and **neuraminidase (NA)**. Both are essential for the influenza virus life cycle. **Hemagglutinin** is a trimeric glycoprotein responsible for binding to sialic acid receptors on host cells and triggering fusion of the viral membrane with the host cell membrane, enabling entry of the viral genome[1][4][7]. **Neuraminidase** is a tetrameric enzyme that cleaves sialic acid residues from glycoproteins and glycolipids, allowing newly formed virus particles to be released from the host cell and spread infection[2][3][5]. The balance between HA and NA activities is critical for virus fitness and transmissibility[5]. Drugs such as oseltamivir and zanamivir target neuraminidase activity, blocking viral release. Both HA and NA are major targets for the immune response and distinguish different influenza virus subtypes (e.g., H1N1, H3N2)[1][4][3]. The combined term is non-canonical; in scientific practice, these molecules are treated and targeted separately. Additional notes: - The input term is **incorrect as a canonical designation**—there is no single protein called "hemagglutinin-neuraminidase" in human influenza A or B viruses. Each gene encodes only one: HA or NA. - Some unrelated paramyxoviruses do have a single glycoprotein called "hemagglutinin-neuraminidase", but for influenza viruses these are discrete proteins. This will allow later structured retrieval of the full relevant information for either hemagglutinin or neuraminidase individually as needed.

Other names

HemagglutininHA proteinNeuraminidaseNA protein

Inhibition of neuraminidase to prevent viral release from host cell, interrupting the viral replication cycle