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Improving T Cell Receptor On-Target Specificity via Structure-Guided Design.

Lance M Hellman1, Kendra C Foley2, Nishant K Singh1

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T cell receptors (TCRs) are promising therapeutics but suffer from cross-reactivity. This study introduces a structure-guided design to enhance TCR specificity without increasing affinity, improving safety for TCR-based therapies.

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T cell receptorcross-reactivitystructural biology

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Area of Science:

  • Immunology
  • Biotechnology
  • Drug Development

Background:

  • T cell receptors (TCRs) are key components of adaptive immunity.
  • TCRs exhibit cross-reactivity, posing challenges for therapeutic development due to potential off-target effects and toxicity.
  • Enhancing TCR affinity can inadvertently worsen cross-reactivity.

Purpose of the Study:

  • To develop a novel structure-guided approach for enhancing TCR specificity independent of affinity.
  • To address the challenge of TCR cross-reactivity in therapeutic applications.
  • To improve the safety profile of TCR-based immunotherapies.

Main Methods:

  • Employed a structure-guided design strategy to engineer TCRs.
  • Investigated the impact of peptide-targeted mutations on TCR reactivity.
  • Tested the novel approach using the MART-1-specific TCR DMF5.

Main Results:

  • Demonstrated that peptide-targeted mutations can introduce new, unintended TCR reactivities.
  • The structure-guided approach showed a modest reduction in cross-reactivity towards MART-1 homologs.
  • Successfully eliminated cross-recognition of unrelated epitopes by the engineered TCR.

Conclusions:

  • Advanced structure-guided design can improve TCR specificity independent of affinity.
  • This approach offers a promising strategy to mitigate TCR cross-reactivity and enhance therapeutic safety.
  • Provides a proof of principle for engineering safer and more effective TCR-based therapeutics.