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Related Experiment Videos

Major histocompatibility complex conformational epitopes are peptide specific.

B Catipović1, J Dal Porto, M Mage

  • 1Department of Medicine, Johns Hopkins University School of Medicine, Johns Hopkins University, Baltimore, Maryland 21224.

The Journal of Experimental Medicine
|December 1, 1992
PubMed
Summary
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Specific peptides stabilize distinct forms of H-2Kb molecules, influencing major histocompatibility complex (MHC) epitopes. This peptide-MHC interaction impacts T cell receptor diversity and repertoire development.

Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • Major histocompatibility complex (MHC) class I molecules present peptide antigens to T cells.
  • The conformation of MHC class I molecules can be influenced by the bound peptide.
  • Distinct epitopes on MHC class I molecules may arise from variations in bound peptides.

Purpose of the Study:

  • To investigate how different peptides stabilize serologically distinct forms of H-2Kb molecules.
  • To determine the peptide-specific stabilization of H-2Kb epitopes recognized by monoclonal antibodies (mAbs).
  • To explore the relationship between peptide binding and MHC conformational epitopes.

Main Methods:

  • Loading empty H-2Kb molecules with various peptides (OVA, MCMV pp89, VSV NP, influenza NP).

Related Experiment Videos

  • Using monoclonal antibodies (mAbs 28.8.6 and 34.4.20) to detect specific H-2Kb epitopes.
  • Immunoprecipitation to assess epitope presence on H-2Kb molecules from normal cells.
  • Alanine substitution analysis of VSV NP peptide to map stabilizing residues.

    • Main Results:

    • The H-2Kb epitope for mAb 28.8.6 was stabilized by OVA and MCMV pp89 peptides, but not VSV NP or influenza NP peptides.
    • The H-2Kb epitope for mAb 34.4.20 was stabilized by VSV NP peptide only.
    • Specific peptide substitutions in VSV NP significantly altered the stabilization of the 28.8.6 epitope.
    • Only a subset of conformationally reactive H-2Kb molecules displayed these specific epitopes.

    Conclusions:

    • Distinct conformational MHC epitopes are critically dependent on the specific peptide bound within the peptide-binding groove.
    • Peptide-induced conformational changes in MHC molecules may influence T cell receptor recognition and T cell repertoire development.
    • Understanding peptide-MHC interactions is crucial for deciphering immune responses and T cell selection processes.