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Related Experiment Videos

Interactions between immunogenic peptides and MHC proteins.

J B Rothbard1, M L Gefter

  • 1ImmuLogic Pharmaceutical Corp., Palo Alto, California 94304.

Annual Review of Immunology
|January 1, 1991
PubMed
Summary

The Major Histocompatibility Complex (MHC) proteins bind peptides slowly, a process crucial for T cell recognition and distinguishing self from non-self. This slow binding may involve conformational changes, with minimal structural requirements for peptide interaction.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • Major Histocompatibility Complex (MHC) class-I and class-II molecules are polymorphic membrane proteins essential for cellular immunity.
  • They present peptide fragments to T lymphocytes, enabling self vs. non-self discrimination.
  • The slow kinetics of peptide binding are critical for effective T cell scanning but poorly understood.

Purpose of the Study:

  • To investigate the binding kinetics and specificity of peptide-MHC interactions.
  • To elucidate the mechanism underlying the slow peptide-MHC association and dissociation rates.
  • To understand the structural requirements for peptide binding to MHC molecules.

Main Methods:

  • Utilized various binding assays to study peptide-MHC interactions.

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  • Employed strategies with modified peptides (e.g., biotinylated, polyalanine) to probe binding requirements.
  • Analyzed crystal structures of MHC class-I alleles (A2, Aw68) to visualize the peptide-binding site.

    • Main Results:

    • Optimal peptide binding occurs for lengths of 8-12 amino acids, with central residues being key.
    • Peptide-MHC binding is characterized by slow association and dissociation rates at physiological pH.
    • Structural requirements for peptide binding are minimal, with avoidance of deleterious contacts being significant.
    • Degenerate binding across multiple MHC alleles suggests conserved features in the binding site.

    Conclusions:

    • The slow binding rate of peptides to MHC molecules may be mediated by a conformational change leading to peptide entrapment.
    • Minimal structural constraints for peptide binding indicate that MHC's selectivity arises from avoiding unfavorable interactions.
    • Structural analysis reveals conserved overall dimensions but variable surface topology in the MHC peptide-binding cleft due to polymorphism.