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The molecular basis of T-cell specificity
1Division of Biochemistry and Biophysics, Food and Drug Administration, Bethesda, Maryland 20892.
Annual Review of Immunology
|January 1, 1990
Summary
Structural characterization of the T-cell receptor (TCR) is crucial for understanding antigen-specific immune responses and T-cell activation. Determining TCR structure will clarify TCR/antigen/MHC interactions and superantigen recognition.
Area of Science:
- Immunology
- Structural Biology
- Molecular Biology
Background:
- Extensive research correlates T-cell receptor (TCR) primary structure with antigen specificity in immune responses.
- Mechanisms for TCR diversity generation and V element selection are understood, but TCR structure remains elusive.
- TCR/antigen/MHC complex structure is key to interpreting functional data.
Purpose of the Study:
- To highlight the necessity of crystallographic characterization of the TCR.
- To explain how TCR structural data will aid interpretation of immune response data.
- To underscore the importance of understanding TCR V beta interactions with superantigens.
Main Methods:
- Crystallography for TCR structural determination.
- Analysis of TCR/antigen/MHC interactions.
- Investigation of T-cell superantigen binding.
Main Results:
- Structural characterization of TCR is pending.
- MHC molecule structure and antigen-binding sites are known, providing a precedent.
- T-cell superantigens stimulate T cells via TCR V beta, indicating a distinct interaction.
Conclusions:
- TCR structural characterization is essential for interpreting TCR usage in immune responses.
- Understanding TCR structure will elucidate positive and negative selection during thymic ontogeny.
- The structural basis of T-cell activation by superantigens requires determination due to clinical significance.