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Three-dimensional structure of poliovirus serotype 1 neutralizing determinants
G S Page1, A G Mosser, J M Hogle
1Department of Applied Biological Sciences, Massachusetts Institute of Technology, Cambridge 02139.
Journal of Virology
|May 1, 1988
Summary
Researchers identified specific amino acid changes in poliovirus that allow it to evade neutralizing antibodies. These mutations cluster in key surface regions, explaining how poliovirus (Poliovirus) variants develop and interact with antibodies.
Area of Science:
- Virology
- Immunology
- Structural Biology
Background:
- Poliovirus causes poliomyelitis, a serious infectious disease.
- Neutralizing monoclonal antibodies are crucial for poliovirus detection and vaccine development.
- Understanding poliovirus antigenic variation is key to combating outbreaks.
Purpose of the Study:
- To identify the specific mutations in poliovirus capsid proteins responsible for altered antigenicity.
- To characterize the immunological phenotypes of poliovirus mutants.
- To map mutation sites within the poliovirus three-dimensional structure and understand their impact on antibody interaction.
Main Methods:
- Isolation of poliovirus antigenic mutants resistant to anti-Sabin neutralizing monoclonal antibodies.
- Sequencing of capsid proteins to identify amino acid replacements in 63 isolates.
- Cross-neutralization analyses using 15 neutralizing anti-Sabin monoclonal antibodies.
- Structural analysis of mutated residues within the poliovirus virion.
Main Results:
- Sixty-three poliovirus antigenic mutants were identified, each with specific amino acid replacements.
- Mutations clustered into distinct peptide segments, defining three immunological phenotypes.
- Mutated residues were located on exposed viral surface features or stabilized antigenic sites through internal interactions.
Conclusions:
- Specific amino acid substitutions drive poliovirus resistance to neutralization.
- The spatial arrangement and interactions of mutated residues explain the generation of neutralization-resistant variants.
- These findings provide insights into poliovirus-antibody interactions and viral evolution.