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Evidence for a complex structure of neutralization antigenic site I of poliovirus type 1 Mahoney
K Wiegers1, H Uhlig, R Dernick
1Heinrich-Pette-Institut für Experimentelle Virologie, Universität Hamburg, Federal Republic of Germany.
Abstract:
We have selected neutralization escape mutants by using a monoclonal antibody (nt-MAb) against a sequential epitope between amino acids 93 through 104 (neutralization antigenic site I) of poliovirus type 1 Mahoney. The majority of mutants were also resistant against five strain-specific nt-MAbs which recognized conformation-dependent epitopes, suggesting that the neutralization antigenic site I must be involved in the formation of such epitopes. An analysis of all mutants by the binding of nt-MAbs and by isoelectric focusing of VP1 allowed discrimination of five classes of mutants. Sequence analysis of mutant RNAs revealed point mutations and deletions in the antibody-binding site.
Insights
Researchers identified poliovirus mutants resistant to neutralization. These escape mutants, affecting neutralization antigenic site I, also showed resistance to other antibodies, indicating site I’s role in forming epitopes.
Area of Science:
- Virology
- Immunology
- Molecular Biology
Background:
- Poliovirus neutralization is crucial for preventing infection.
- Monoclonal antibodies (MAbs) targeting specific epitopes are key tools for studying viral immunity.
- Understanding neutralization escape mechanisms is vital for vaccine development.
Purpose of the Study:
- To generate and characterize neutralization escape mutants of poliovirus type 1 Mahoney.
- To investigate the role of neutralization antigenic site I in antibody recognition and viral escape.
- To elucidate the structural basis of poliovirus escape from neutralizing antibodies.
Main Methods:
- Selection of neutralization escape mutants using a specific anti-Epitope I monoclonal antibody (nt-MAb).
- Testing mutant resistance against a panel of strain-specific nt-MAbs.
- Isoelectric focusing of viral protein 1 (VP1) and nt-MAb binding assays.
- RNA sequencing to identify mutations in escape mutants.
Main Results:
- The majority of selected mutants exhibited resistance to multiple nt-MAbs, including those recognizing conformation-dependent epitopes.
- Mutants were classified into five distinct groups based on antibody binding and VP1 isoelectric focusing.
- Sequence analysis revealed point mutations and deletions within the antibody-binding site of the viral RNA.
Conclusions:
- Neutralization antigenic site I is critically involved in the formation of conformation-dependent epitopes.
- Mutations within neutralization antigenic site I can confer broad-spectrum resistance to neutralizing antibodies.
- These findings provide insights into poliovirus evolution and antibody escape mechanisms.