Primary Citation of Related Structures: 1QRN, 1QSE, 1QSF
PubMed Abstract:
The interactions of three singly substituted peptide variants of the HTLV-1 Tax peptide bound to HLA-A2 with the A6 T cell receptor have been studied using T cell assays, kinetic and thermodynamic measurements, and X-ray crystallography. The three peptide/MHC ligands include weak agonists and antagonists with different affinities for TCR ...
The interactions of three singly substituted peptide variants of the HTLV-1 Tax peptide bound to HLA-A2 with the A6 T cell receptor have been studied using T cell assays, kinetic and thermodynamic measurements, and X-ray crystallography. The three peptide/MHC ligands include weak agonists and antagonists with different affinities for TCR. The three-dimensional structures of the three A6-TCR/peptide/HLA-A2 complexes are remarkably similar to each other and to the wild-type agonist complex, with minor adjustments at the interface to accommodate the peptide substitutions (P6A, V7R, and Y8A). The lack of correlation between structural changes and the type of T cell signals induced provides direct evidence that different signals are not generated by different ligand-induced conformational changes in the alphabeta TCR.
Related Citations:
Structure of the complex between human T-cell receptor, viral peptide and HLA-A Garboczi, D.N., Ghosh, P., Utz, U., Fan, Q.R., Biddison, W.E., Wiley, D.C. (1996) Nature 384: 134
Two human T cell receptors bind in a similar diagonal mode to the HLA-A2/Tax peptide complex using different TCR amino acids. Ding, Y.H., Smith, K., Garboczi, D.N., Utz, U., Biddison, W.E., Wiley, D.C. (1998) Immunity 8: 403
Organizational Affiliation:
Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
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