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Related Concept Videos

Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
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The cold truth about TCR structure.

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This summary is machine-generated.

Cryo-electron microscopy revealed that the complete T-cell receptor (TCR) complex bound to peptide-MHC does not undergo allosteric changes. This finding challenges the idea of ligand-induced conformational shifts in TCR signaling.

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Area of Science:

  • Immunology
  • Structural Biology
  • Biochemistry

Background:

  • The T-cell receptor (TCR) complex is crucial for adaptive immunity, mediating T-cell activation upon recognition of peptide-MHC complexes.
  • Understanding the conformational dynamics of the TCR complex upon ligand binding is essential for elucidating T-cell signaling mechanisms.
  • Previous hypotheses suggested ligand-induced allosteric conformational changes within the TCR complex.

Purpose of the Study:

  • To investigate the structural and conformational consequences of peptide-MHC binding to the complete T-cell receptor complex.
  • To provide direct structural evidence for or against ligand-induced allosteric modulation of the TCR complex.

Main Methods:

  • Cryo-electron microscopy (Cryo-EM) was employed to determine the high-resolution structure of the complete TCR complex.
  • The structure was analyzed in its apo state and in complex with a cognate peptide-MHC ligand.
  • Comparative structural analysis focused on identifying conformational differences between the two states.

Main Results:

  • The high-resolution Cryo-EM structure of the complete TCR complex bound to peptide-MHC was obtained.
  • No significant allosteric conformational changes were observed in the TCR complex upon peptide-MHC binding.
  • The structure suggests a pre-formed or constitutively active conformation of the TCR complex.

Conclusions:

  • The study provides direct structural evidence refuting the model of ligand-induced allosteric conformational changes in the TCR complex.
  • These findings imply that T-cell receptor activation may rely on mechanisms other than major allosteric rearrangements upon ligand engagement.
  • The structural data offers a new framework for understanding TCR-pMHC interactions and T-cell activation.