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Related Experiment Videos

Mapping epitopes and antigenicity by site-directed masking.

Didrik Paus1, Greg Winter

  • 1Division of Protein and Nucleic Acid Chemistry, Medical Research Council Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|June 7, 2006
PubMed
Summary

This study introduces a novel method to map antibody binding sites on antigens by masking surface regions. This technique revealed key antigenic epitopes and linked antibody responses to protein flexibility, particularly in flexible loops.

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Greg Winter.

Nature biotechnology·2011

Area of Science:

  • Immunology
  • Structural Biology
  • Biochemistry

Background:

  • Mapping antibody-epitope interactions is crucial for understanding immune responses and developing vaccines.
  • Current methods may lack precision in identifying specific binding sites on folded antigens.

Purpose of the Study:

  • To develop and validate a method for precisely mapping antibody binding sites on folded protein surfaces.
  • To characterize the epitopes of monoclonal and polyclonal antibodies against beta-lactamase.
  • To investigate the relationship between antigen flexibility and antibody recognition.

Main Methods:

  • Creation of mutant antigens (beta-lactamase) with single cysteine residues on the surface.
  • Chemical tethering of cysteine residues to a solid phase to mask surface patches.

Related Experiment Videos

  • Epitope mapping using masked antigens and antibody binding assays.
  • Analysis of antibody responses to native and denatured antigens after immunization.

    • Main Results:

    • Successfully mapped epitopes for several monoclonal antibodies (mAbs) against beta-lactamase.
    • Identified 23 distinct epitopes using antibody depletion assays with polyclonal antisera.
    • Demonstrated that immunization with Freund's adjuvant (inducing denaturation) elicits antibodies targeting flexible loops.
    • Showed that immunization in PBS results in a broader antibody response over the antigen surface.

    Conclusions:

    • The developed method effectively maps antibody-antigen interactions on folded proteins.
    • Antigen flexibility, especially in loop regions, significantly influences antibody recognition.
    • The method of antigen preparation (native vs. denatured) during immunization impacts the resulting antibody epitope specificity.