What is the function of hemagglutinin in the influenza virus quizlet?
Hemagglutinin (HA) or Haemagglutinin (BE) is an antigenic glycoprotein found on the surface of the influenza viruses. It is responsible for binding the virus to the cell that is being infected.
Does influenza have hemagglutinin?
Influenza A virions possess two surface glycoproteins—the hemagglutinin (HA) and neuraminidase (NA)—which exert opposite functions.
Are any viruses motile?
Until now, it was generally accepted that no viruses, including influenza, possess motile machinery. Our findings confirmed the presence of motile machinery employing HA and NA molecules in IAV. This virus motility mechanism is different from those known to exist in bacterial and eukaryotic cells.
What protein does influenza bind to?
For influenza viruses, it has been known for a long time that the viral attachment protein, hemagglutinin (HA), binds to and uses sialic acid-containing molecules as receptors.
What makes up the influenza virus?
All influenza viruses consist of single-stranded RNA as opposed to dual-stranded DNA. The RNA genes of influenza viruses are made up of chains of nucleotides that are bonded together and coded by the letters A, C, G and U, which stand for adenine, cytosine, guanine, and uracil, respectively.
What cells does the influenza virus infect?
Influenza virus replicates in the epithelial cells throughout the respiratory tree, with virus being recoverable from both the upper and lower respiratory tract of people naturally or experimentally infected (2).
Does every virus have a capsid?
Each virus possesses a protein capsid to protect its nucleic acid genome from the harsh environment. Virus capsids predominantly come in two shapes: helical and icosahedral. The helix (plural: helices) is a spiral shape that curves cylindrically around an axis.
What is the role of N neuraminidase proteins of influenza viruses?
An important function of the NA protein is to remove sialic acid from glycoproteins. Sialic acid is present on many cell surface proteins as well as on the viral glycoproteins; it is the cell receptor to which influenza virus attaches via the HA protein.
What does the N neuraminidase designation indicate?
The designation “H1N1” indicates unique traits, which exhibit characteristics that identify the virus to the immune system and allows for attachment and replication of the virus. The “H” (hemagglutinin) and the “N” (neuraminidases) are both proteins that are found on the outer shell or envelope of the virus.
Which one is not useful in the treatment of virus?
Antibiotics cannot kill viruses because bacteria and viruses have different mechanisms and machinery to survive and replicate. The antibiotic has no “target” to attack in a virus. However, antiviral medications and vaccines are specific for viruses.