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Related Experiment Videos

Conformational differences in major histocompatibility complex-peptide complexes can result in alloreactivity

S Chattopadhyay1, M Theobald, J Biggs

  • 1Department of Immunology, Scripps Research Institute, La Jolla, California 92037.

The Journal of Experimental Medicine
|January 1, 1994
PubMed
Summary

Mutations in major histocompatibility complex (MHC) molecules can alter peptide binding, leading to strong allogeneic responses. This study reveals that conformational changes in the peptide-MHC complex, not just peptide binding differences, drive these T cell responses.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Class I Major Histocompatibility Complex (MHC) molecules present peptides to T cells.
  • Mutations affecting peptide binding can elicit strong allogeneic responses, often attributed to altered peptide binding repertoires.

Purpose of the Study:

  • To investigate the role of allopeptides in the alloreactivity between Kb and its mutant Kbm8.
  • To determine if differences in peptide binding or molecular conformation underlie the observed alloreactivity.

Main Methods:

  • Utilized Kb-specific cytotoxic T lymphocyte (CTL) clones.
  • Examined peptide presentation by wild-type Kb and mutant Kbm8 molecules.
  • Assessed T cell recognition of allopeptides associated with both MHC variants.

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Main Results:

  • Most Kb-specific CTL clones did not recognize Kbm8 targets, despite strong mutual alloreactivity.
  • Allopeptides recognized by Kb-specific clones were found associated with both Kb and Kbm8.
  • Increasing peptide levels did not restore reactivity to Kbm8, indicating peptide presence/absence was not the primary driver.

Conclusions:

  • Alloreactivity in the Kb/Kbm8 system is not solely due to differences in bound allopeptides.
  • Conformational differences in the peptide-MHC complex are a significant factor in T cell recognition and alloreactivity.
  • T cell recognition of conformational variations between MHC molecules can drive strong alloreactive responses.