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Related Experiment Videos

Characterization of Mengo virus neutralization epitopes.

U Boege1, D Kobasa, S Onodera

  • 1Department of Biochemistry, University of Alberta, Edmonton, Canada.

Virology
|March 1, 1991
PubMed
Summary

Researchers identified mutations in Mengo virus escape mutants, revealing a single composite neutralization site on the viral capsid. This site, formed by altered VP2 and VP3 proteins, is crucial for antibody binding and viral infectivity.

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Area of Science:

  • Virology
  • Structural Biology
  • Immunology

Background:

  • Mengo virus infectivity is neutralized by specific monoclonal antibodies.
  • Understanding viral neutralization sites is key to developing antiviral strategies.

Purpose of the Study:

  • To identify and characterize the neutralization sites on the Mengo virus capsid.
  • To elucidate the structural basis of viral escape from antibody neutralization.

Main Methods:

  • Selection of Mengo virus escape mutants resistant to antibody neutralization.
  • Sequence analysis of capsid-coding regions to identify amino acid alterations.
  • Structural mapping of mutations onto the Mengo virus capsid.

Main Results:

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  • Twenty escape mutants were generated, with mutations predominantly in VP2 and VP3 proteins.
  • Mengo virus VP2 and VP3 mutations align with known neutralization sites in other picornaviruses.
  • Cross-neutralization experiments revealed a single composite neutralization site on the Mengo virion.
  • Mutations are located on the outer surface of the capsid, forming a crescent-shaped area around the three-fold axes.

    • Conclusions:

    • A single composite antigenic determinant, comprising altered VP2 and VP3 residues, mediates Mengo virus neutralization.
    • This site is distinct from the cellular receptor binding site.
    • The findings provide insights into viral evolution and antibody evasion mechanisms.