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Influenza hemagglutinin: a homotrimeric glycoprotein that is found on the surface of influenza viruses which is responsible for their infectivity. [13] Influenza strains are named for the specific hemagglutinin variant they produce, along with the specific variant of another surface protein, neuraminidase.
Since hemagglutinin is the major surface protein of the influenza A virus and is essential to the entry process, it is the primary target of neutralizing antibodies. [citation needed] These antibodies against flu have been found to act by two different mechanisms, mirroring the dual functions of hemagglutinin:
The structure of the influenza virus neuraminidase. [2] Structure of Influenza, showing neuraminidase marked as NA and hemagglutinin as HA Influenza virus replication, showing how in step 6 the neuraminidase and hemagglutinin proteins incorporated into the host cell's membrane are used to escape.
The HA-tag is a protein tag derived from the human influenza hemagglutinin (HA) protein, which allows the virus to target and enter host cells. An HA-tag is composed of a peptide derived from the HA-molecule corresponding to amino acids 98-106, which can be recognized and selectively bound by commercially available antibodies .
Hemagglutinin-neuraminidase refers to a single viral protein that has both hemagglutinin and (endo) neuraminidase EC 3.2.1.18 activity. This is in contrast to the proteins found in influenza, where both functions exist but in two separate proteins.
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Subtypes of IAV are defined by the combination of the antigenic H and N proteins in the viral envelope; for example, "H1N1" designates an IAV subtype that has a type-1 hemagglutinin (H) protein and a type-1 neuraminidase (N) protein. [7] Almost all possible combinations of H (1 through 16) and N (1 through 11) have been isolated from wild birds ...
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