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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.
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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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Discovering immunoreceptor coupling and organization motifs.

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  • 1Department of Molecular Immunology, Biology III, Faculty of Biology, University of Freiburg, Freiburg, Germany.

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Summary

New research reveals conserved leucine zipper motifs in antigen receptors, suggesting they form larger complexes. This finding is crucial for understanding immune cell signaling and designing better vaccines.

Keywords:
ITAMantigen receptorsleucine zippernanoscale receptor organizationresting state of lymphocytes

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Area of Science:

  • Immunology
  • Structural Biology
  • Molecular Biology

Background:

  • Cryo-EM structures of T cell antigen receptor (TCR) and B cell antigen receptor (BCR) reveal ligand-binding interactions but not signaling mechanisms.
  • Understanding antigen receptor signaling is vital for rational vaccine design.

Purpose of the Study:

  • To investigate the molecular basis of antigen receptor signaling and organization.
  • To identify conserved motifs involved in antigen receptor complex formation and lateral interactions.

Main Methods:

  • Analysis of evolutionary conserved amino acid sequences within transmembrane domains of antigen receptors and related proteins.
  • Identification of leucine zipper (LZ) motifs and their potential role in complex formation.

Main Results:

  • Discovered conserved leucine zipper (LZ) motifs, termed immunoreceptor coupling and organization motifs (ICOMs), within the transmembrane domains of antigen and coreceptor components.
  • These ICOMs are likely involved in the oligomerization and lateral interaction of antigen receptor complexes on T and B cells.
  • ICOMs are also found in other receptor types and viral envelope proteins, suggesting a broader role in receptor organization.

Conclusions:

  • Antigen receptors function as part of a larger interactome, not as isolated units.
  • ICOMs mediate the nanoscale organization of antigen receptors on resting cells and their remodeling upon activation.
  • This provides a new framework for understanding immune receptor function and potential therapeutic targeting.