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T-cell recognition of antigen. A process controlled by transient intermolecular interactions
1Department of Microbiology and Immunology, Stanford University School of Medicine, California 94305-5428, USA.
Annals of the New York Academy of Sciences
|September 7, 1995
Summary
Understanding T-cell receptor (TCR) and MHC interactions is crucial for T-cell immunity. New research reveals these interactions are transient, with rapid off-rates, suggesting a model of reversible cell-cell association.
Area of Science:
- Immunology
- Molecular Biology
- Biophysics
Background:
- The T-cell receptor (TCR) and its interaction with peptide-MHC complexes are central to adaptive immunity.
- Despite advances in cloning TCRs and determining MHC structures, the dynamics of these interactions remain poorly understood.
Purpose of the Study:
- To investigate the kinetic parameters governing TCR-MHC interactions.
- To elucidate the role of molecular interactions in T-cell-mediated immunity.
Main Methods:
- Engineering soluble forms of proteins involved in T-cell recognition.
- Measuring kinetic parameters of TCR-MHC and other relevant interactions.
Main Results:
- Many T-cell recognition interactions exhibit transient behavior with very rapid off-rates.
- A model is proposed where reversible intermolecular interactions mediate cell-cell adhesion.
- Adhesion molecules likely stabilize conjugates before TCR-MHC engagement, with diffusion concentrating interactions at the interface.
Conclusions:
- Highly reversible interactions are key to T-cell-mediated cell-cell association.
- Rapid off-rates are essential for maintaining reversibility and efficient signaling or disengagement.
- This dynamic model provides insights into the mechanisms of T-cell activation and regulation.