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Ligand recognition by alpha beta T cell receptors
M M Davis1, J J Boniface, Z Reich
1Howard Hughes Medical Institute, Stanford University School of Medicine, California 94305, USA. mdavis@cmgm.stanford.edu
Annual Review of Immunology
|May 23, 1998
Summary
Biochemistry of T cell receptor-ligand interactions predicts T cell response strength. Structural data reveals TCR engagement orientation and highlights diverse CDR3 loops as key to antigen receptor specificity.
Area of Science:
- Immunology
- Biochemistry
- Structural Biology
Background:
- T cell receptor (TCR) interactions are crucial for adaptive immunity.
- Understanding TCR-ligand binding mechanisms is essential for predicting immune responses.
Purpose of the Study:
- To investigate the predictive value of T cell receptor-ligand interactions in cell-free systems.
- To elucidate the structural basis of TCR engagement with peptide/MHC.
- To analyze the role of CDR3 loops in antigen receptor specificity.
Main Methods:
- Biochemical analysis of T cell receptor-ligand interactions.
- Structural determination of T cell receptor molecules and TCR-ligand complexes.
- Analysis of complementarity-determining region 3 (CDR3) loop diversity.
Main Results:
- Biochemistry data from cell-free systems show predictive value for T cell response strength (strong, weak, or suppressive).
- Structural data confirm a fixed orientation for TCR engagement with peptide/MHC.
- Emerging evidence suggests higher oligomer formation.
- Highly diverse CDR3 loops are present in all antigen receptors.
Conclusions:
- T cell receptor-ligand biochemistry provides insights into T cell responsiveness.
- Structural data on TCR-ligand complexes support a model of fixed engagement orientation.
- CDR3 loops are central to the specificity of both T cell receptors and antibodies.