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Diversity of Antigen Receptors

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 Selection

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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...

Antigens Involved in Adaptive Immunity

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.

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Using X-ray Crystallography, Biophysics, and Functional Assays to Determine the Mechanisms Governing T-cell Receptor Recognition of Cancer Antigens

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Immunodominant-peptide recognition: beta testing TCRalphabeta.

Jia-huai Wang¹, Robert J Mallis, Ellis L Reinherz

¹Laboratory of Immunobiology and Department of Medical Oncology, Dana-Farber Cancer Institute, 44 Binney St., Boston, MA 02115, USA.

|February 16, 2008

Summary

Researchers detailed how T cell receptors recognize an influenza A peptide bound to HLA-A*0201. This provides atomic-level insights into immune responses and T cell beta chain function.

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Area of Science:

Immunology
Structural Biology
Virology

Background:

The adaptive immune system relies on T cell receptors (TCRs) to recognize foreign antigens presented by human leukocyte antigens (HLAs).
Influenza A virus poses a significant global health threat, necessitating a deep understanding of its interaction with the host immune system.

Discussion:

Ishizuka et al. present the atomic structure of an immunodominant influenza A matrix peptide bound to the HLA-A*0201 molecule.
This structural elucidation reveals the precise molecular interactions governing T cell receptor recognition of the peptide-MHC complex.

Key Insights:

The study defines, in atomic detail, the recognition of an influenza A matrix peptide by human T cell receptors.
The findings offer critical insights into the structural basis of T cell-mediated immunity against influenza viruses.

Outlook:

This work raises significant questions regarding the role and function of the T cell receptor's beta chain in antigen recognition.
Further research into TCR beta chain function could lead to novel therapeutic strategies for influenza and other viral infections.