Recombinant Hemagglutinin neuraminidase protein (Tagged)

Supplementary information

This supplementary information is collated from multiple sources and compiled automatically.

Hemagglutinin neuraminidase often known as HN is a protein complex mechanically combining the functions of both hemagglutinin and neuraminidase activities. This protein resides on the surface of certain viruses particularly within the Paramyxoviridae family like human parainfluenza viruses. The hemagglutinin component assists the virus in attaching to the host cell by binding to sialic acid residues on the cell surface. The neuraminidase activity then helps the release of the newly formed viral particles by cleaving sialic acids preventing the aggregation of virions. The protein usually displays a mass of around 66 kDa with its expression highly specific to the cells infected by the virus.

Biological function summary

The hemagglutinin neuraminidase protein plays a critical role in viral infectivity and propagation. Its dual functions significantly contribute to both the initial adhesion of the virus to the host cell and the subsequent release of progeny virions. The interaction of hemagglutinin and neuraminidase activities facilitates efficient viral replication making the protein essential for the viral life cycle. It often forms part of a larger protein complex on the viral surface to enhance its multifunctional capabilities assisting in the spread from host to host.

Pathways

Hemagglutinin neuraminidase actively participates in the sialic acid biosynthesis and interference pathways. The enzymatic removal and binding actions of this protein modulate the sialic acid-rich glycoproteins and glycolipids found on the host cell surface. This process is essential for preventing premature viral aggregation allowing efficient release of newly produced virions. The protein interacts with other viral surface proteins such as the fusion protein (F) in viruses to optimize infective efficiency across host cells integrating into notable synergy within a successful infection pathway.

Hemagglutinin neuraminidase significantly relates to respiratory illnesses caused by paramyxoviruses such as croup in children and certain types of pneumonia. Its role in viral attachment and release makes it an important player in the pathogenesis of these diseases. Additionally the protein connects to disease processes through its interaction with other viral proteins including the aforementioned fusion protein which contributes to the pathophysiology of viral infections by mediating membrane fusion required for viral entry into the host cell. Overall hemagglutinin neuraminidase’s function and interaction with cell surfaces highlight its impact on viral virulence and pathogenicity in respiratory tract conditions.