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Related Experiment Video

Updated: May 14, 2026

Using X-ray Crystallography, Biophysics, and Functional Assays to Determine the Mechanisms Governing T-cell Receptor Recognition of Cancer Antigens
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Revisiting the putative TCR Cα dimerization model through structural analysis.

Jia-Huai Wang1, Ellis L Reinherz

  • 1Laboratory of Immunobiology, Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School Boston, MA, USA ; Department of Pediatrics, Harvard Medical School Boston, MA, USA ; Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School Boston, MA, USA.

Frontiers in Immunology
|February 7, 2013
PubMed
Summary
This summary is machine-generated.

T cell receptor (TCR) activation by peptide-MHC (pMHC) is not driven by TCR dimerization. Structural analysis shows no Cα-Cα contacts, and glycans prevent dimerization, suggesting alternative activation mechanisms at the immune synapse.

Keywords:
TCRreceptor dimerizationsignal transductionstructural immunology

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A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins

Published on: March 22, 2012

Area of Science:

  • Immunology
  • Structural Biology
  • Molecular Biology

Background:

  • T cell receptor (TCR) activation is crucial for adaptive immunity.
  • The precise mechanism of TCR triggering by peptide-MHC (pMHC) ligands remains debated.
  • Two prevailing models propose either monomeric TCR-pMHC ligation or TCR-TCR cis-dimerization via Cα domains.

Purpose of the Study:

  • To investigate the structural basis of TCR activation.
  • To evaluate the hypothesis that TCR-TCR dimerization is critical for pMHC ligand-induced activation.
  • To determine if structural data supports TCR dimerization through Cα domains.

Main Methods:

  • Analysis of 22 existing crystal structures of TCR/pMHC complexes.
  • Examination of potential Cα-Cα contacts in TCR structures.
  • Assessment of the impact of Cα domain glycan adducts on dimerization.

Main Results:

  • No predicted molecular Cα-Cα contacts were identified in the analyzed TCR/pMHC crystal structures.
  • Conserved glycan adducts on the Cα domain outer face sterically hinder hypothesized TCR dimerization.
  • Functional effects of Cα mutations are likely indirect, not due to dimerization.

Conclusions:

  • TCR-TCR dimerization via Cα domain interaction is unlikely to be the primary mechanism for pMHC-induced TCR activation.
  • TCR microcluster formation at the immunological synapse is likely mediated by transmembrane/cytoplasmic domain interactions.
  • Alternative signaling pathways involving scaffold proteins and cytoskeletal elements drive TCR microcluster formation and activation.