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[Measles Virus].

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Measles virus (MeV) remains a significant threat, but vaccines are effective. The MeV hemagglutinin (H) protein

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Area of Science:

  • Virology
  • Immunology
  • Structural Biology

Background:

  • Measles virus (MeV) is highly contagious and a leading cause of childhood mortality.
  • Increased vaccination coverage has led to significant progress in measles elimination efforts.
  • The MeV hemagglutinin (H) protein mediates viral entry by interacting with cellular receptors.

Purpose of the Study:

  • To elucidate the role of the MeV H protein in viral infection and vaccine effectiveness.
  • To understand the structural basis for MeV receptor interactions and neutralization.
  • To explain the long-term efficacy of existing measles vaccines.

Main Methods:

  • Analysis of MeV H protein structure and function.
  • Investigation of H protein interactions with cellular receptors SLAM and nectin-4.
  • Epitope mapping of the H protein's receptor binding site.

Main Results:

  • The H protein binds to SLAM on immune cells and nectin-4 on epithelial cells, explaining MeV's properties.
  • Receptor binding by H protein triggers conformational changes in the fusion (F) protein for viral entry.
  • The receptor binding site on the H protein is a key neutralizing epitope.
  • Functional constraints on this epitope limit amino acid changes, contributing to vaccine efficacy.

Conclusions:

  • The MeV H protein's interaction with two distinct receptors is crucial for viral pathogenesis.
  • The conserved nature of the H protein's receptor binding site explains the enduring effectiveness of current measles vaccines.
  • Understanding these interactions provides insights into MeV control and vaccine development.