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Related Concept Videos

Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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...
T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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.
Naive T cells that have not yet encountered an antigen express two primary CD...
T Cell Types and Functions01:24

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Enzyme-linked Receptors01:00

Enzyme-linked Receptors

Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
Neurotrophin (NT) receptors are a family of RTKs, including trkA, trkB, and trkC (tropomyosin-related kinase) receptors. TrkA is specific for nerve growth factor (NGF), neurotrophin-6, and neurotrophin-7. TrkB binds...
Receptor Tyrosine Kinases01:26

Receptor Tyrosine Kinases

Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR activation may...

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Updated: May 22, 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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Why rethink the structure-function relationships regulating TCR behavior?

Melvin Cohn1

  • 1Conceptual Immunology Group, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, Tel: (858) 453-4100 Ext. 1351.

Current Trends in Immunology
|May 11, 2012
PubMed
Summary
This summary is machine-generated.

The Standard Model of T-cell receptor (TCR) function is limited. A new view challenges TCR structure-function relationships, suggesting a competing model may better explain experimental data.

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A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins
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Measuring TCR-pMHC Binding In Situ using a FRET-based Microscopy Assay
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Measuring TCR-pMHC Binding In Situ using a FRET-based Microscopy Assay

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Measuring TCR-pMHC Binding In Situ using a FRET-based Microscopy Assay

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Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • The Standard Model of T-cell receptor (TCR) function is widely accepted but has limitations.
  • A key tenet suggests allele-specific recognition of MHC-encoded elements arises from somatic selection on a random repertoire.

Purpose of the Study:

  • To highlight the limitations of the Standard Model.
  • To propose a new perspective on TCR structure-function relationships.
  • To discuss experimental evidence supporting an alternative model.

Main Methods:

  • The study reviews existing literature and discusses a published experiment.
  • It analyzes the implications of the Standard Model's tenets.
  • It explores potential alternative models for TCR recognition.

Main Results:

  • The Standard Model's core tenet regarding TCR repertoire generation is insufficient.
  • This limitation necessitates a re-evaluation of TCR structure-function relationships.
  • Experimental data can be interpreted to support a competing model.

Conclusions:

  • The Standard Model of TCR function requires revision.
  • A new model offers a more comprehensive explanation for TCR-MHC interactions.
  • Understanding TCR structure-function is crucial for immunology.