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Area of Science:

  • Immunology
  • Cellular Biology
  • Molecular Biology

Background:

  • T cell activation relies on T cell receptors (TCRs) binding to peptide-MHC (pMHC) complexes on antigen-presenting cells.
  • T cells exhibit high sensitivity, responding to single pMHC interactions, leading to hypotheses about higher-order TCR structures.
  • The precise molecular configuration of TCRs involved in antigen recognition remains unclear.

Purpose of the Study:

  • To determine the stoichiometry of T cell receptor (TCR) and CD3 complexes on the surface of living T cells.
  • To investigate the role of TCR-CD3 complex stoichiometry in T cell antigen recognition and signaling.

Main Methods:

  • Utilized single-molecule brightness and coincidence analysis.
  • Employed photon-antibunching-based fluorescence correlation spectroscopy.
  • Conducted Förster resonance energy transfer (FRET) measurements on living T cells.

Main Results:

  • Exclusively monomeric TCR-CD3 complexes were found on the T cell surface.
  • Single TCR-CD3 complexes were identified as the functional units for recognizing antigenic pMHCs.
  • Demonstrated that individual TCR-CD3 complexes can elicit robust intracellular signaling.

Conclusions:

  • TCR-CD3 complexes function as monomers during T cell antigen recognition.
  • A single TCR-CD3 complex possesses the capacity to initiate significant intracellular signaling pathways.
  • This finding refines our understanding of T cell sensitivity and activation mechanisms.