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Recognition surfaces of MHC class I

E Y Jones¹, J Tormo, S W Reid

¹Laboratory of Molecular Biophysics, Oxford, UK. Yvon@biop.ox.ac.uk

Immunological Reviews

|August 13, 1998

Summary

Recent crystallographic data reveals how T-cell receptors (TCRs) bind to MHC class I molecules. Key interactions with the MHC scaffold dictate TCR orientation, influencing immune recognition of peptides.

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Area of Science:

Immunology
Structural Biology
Molecular Recognition

Background:

Recent crystallographic studies offer high-resolution insights into MHC class I-mediated recognition events.
The interaction between MHC class I/peptide and T-cell receptors (TCRs) is crucial for adaptive immunity.
Understanding these molecular interactions is key to deciphering immune responses.

Purpose of the Study:

To elucidate the structural basis of TCR recognition of MHC class I/peptide complexes.
To analyze the role of specific interactions with the MHC scaffold in determining TCR binding orientation.
To re-evaluate previous findings on TCR recognition variations in light of new structural data.

Main Methods:

High-resolution crystallography
Structural analysis of molecular interactions
Comparative analysis of protein-protein interfaces

Main Results:

Key interactions with the MHC scaffold, particularly involving the TCR V alpha domain, establish a standard TCR binding orientation.
The binding of CD8 to MHC class I utilizes loops, similar to antibody-antigen interactions.
Despite similar buried surface areas and low affinity, the CD8-MHC interaction exhibits precise shape complementarity, unlike the TCR-MHC interface.

Conclusions:

A defined TCR binding mode to MHC class I molecules has been structurally characterized.
The precise interaction of CD8 with MHC class I highlights a distinct binding mechanism compared to TCR recognition.
These findings provide a framework for reinterpreting variations in TCR recognition of MHC/peptide complexes.

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