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Area of Science:

  • Immunology
  • Structural Biology
  • Biophysics

Background:

  • T cell receptor (TCR) specificity is fundamental to adaptive immunity, governing T cell responses.
  • The TCR's ability to bind peptide-MHC complexes is a key determinant of its specificity.
  • A long-standing paradox in immunology is that TCRs exhibit both high specificity and significant cross-reactivity.

Purpose of the Study:

  • To review and discuss the principles underlying T cell receptor (TCR) specificity and cross-reactivity.
  • To emphasize findings from structural and physical studies of TCR binding.
  • To explore the implications of TCR binding principles for TCR-based therapeutics and predictive immunology.

Main Methods:

  • Review of existing literature focusing on structural and biophysical studies of TCR-peptide-MHC interactions.
  • Analysis of TCR binding data through the lens of structural and biophysical principles.
  • Comparison of predictions derived from these principles with established knowledge of TCR cross-reactivity.

Main Results:

  • Structural and biophysical principles can effectively rationalize the observed duality of TCR specificity and cross-reactivity.
  • These principles align well with classic predictions regarding the scope of TCR cross-reactivity.
  • The same principles can explain amino acid preferences within immunogenic epitopes.

Conclusions:

  • The enigmatic specificity/cross-reactivity of T cell receptors can be understood through structural and biophysical mechanisms.
  • These insights offer opportunities for improving TCR-based therapeutic development.
  • Structural considerations hold promise for advancing predictive immunology.