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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Related Experiment Video

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Examination of Thymic Positive and Negative Selection by Flow Cytometry
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Pre-T cell receptors topologically sample self-ligands during thymocyte β-selection.

Xiaolong Li1,2,3, Réka Mizsei1, Kemin Tan4

  • 1Laboratory of Immunobiology, Dana-Farber Cancer Institute, Boston, MA, USA. jwang@crystal.harvard.edu ellis_reinherz@dfci.harvard.edu.

Science (New York, N.Y.)
|December 18, 2020
PubMed
Summary

The pre-T cell receptor (preTCR) uses a unique "horizontal" binding mechanism to sample peptides, distinct from the "vertical" binding of alpha-beta T cell receptors (TCRs). This preTCR interaction guides subsequent TCR selection and repertoire diversification.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • Thymocyte development involves self-discrimination, a crucial process mediated by T cell receptors (TCRs).
  • The precise molecular mechanisms of pre-TCR and TCR interactions during this process remain incompletely understood.

Purpose of the Study:

  • To elucidate the distinct binding modes of pre-TCRs and alpha-beta TCRs to MHC molecules.
  • To understand how these distinct interactions influence T cell repertoire development and selection.

Main Methods:

  • X-ray crystallography was employed to determine the high-resolution structures of pre-TCR and TCR interactions.
  • Comparative structural analysis of pre-TCR and TCR binding interfaces.

Main Results:

  • The pre-TCR utilizes a "horizontal" docking mechanism, engaging the MHC α2-helix with its Vβ domain.
  • Alpha-beta TCRs employ a "vertical" head-to-head binding mode, utilizing all six CDR loops to recognize peptide-MHC complexes.
  • The pre-TCR's binding mode facilitates sampling of the peptide's C-terminal region, setting the stage for canonical alpha-beta TCR docking.

Conclusions:

  • The pre-TCR's distinct binding strategy allows for broader β-chain repertoire diversification by preventing germline CDR1β and CDR2β interactions with MHC.
  • This sequential attunement of recognition logic by receptor subunits is critical for refining the T cell repertoire before alpha-beta TCR-mediated selection.