Complexes of five peptides (from HIV-1, influenza A virus, HTLV-1, and hepatitis B virus proteins) bound to the human class I MHC molecule HLA-A2 have been studied by X-ray crystallography. While the peptide termini and their second and C-terminal anchor side chains are bound similarly in all five cases, the main chain and side chain conformations of each peptide are strikingly different in the center of the binding site, and these differences are accessible to direct TCR recognition ...
Complexes of five peptides (from HIV-1, influenza A virus, HTLV-1, and hepatitis B virus proteins) bound to the human class I MHC molecule HLA-A2 have been studied by X-ray crystallography. While the peptide termini and their second and C-terminal anchor side chains are bound similarly in all five cases, the main chain and side chain conformations of each peptide are strikingly different in the center of the binding site, and these differences are accessible to direct TCR recognition. Each of the central peptide residues is seen to point up for some bound peptides, but down or sideways for others. Thus, although fixed at its ends, the structure of an MHC-bound peptide appears to be a highly complex function of its entire sequence, potentially sensitive to even small sequence differences. In contrast, MHC structural variation is relatively limited. These results offer a structural framework for understanding the role of nonanchor peptide side chains in both peptide-MHC binding affinity and TCR recognition.
Related Citations:
Hla-A2-Peptide Complexes: Refolding and Crystallization of Molecules Expressed in Escherichia Coli and Complexed with Single Antigenic Peptides Garboczi, D.N., Hung, D.T., Wiley, D.C. (1992) Proc Natl Acad Sci U S A 89: 3429
The Minimum Peptide Epitope from the Influenza Virus Matrix Protein Bednarek, M.A., Sauma, S.Y., Gammon, M.C., Porter, G., Tamhankar, S., Williamson, A.R., Zweerink, H.J. (1991) J Immunol 147: 4047
Identification of the Nonamer Peptide from Influenza a Matrix Protein and the Role of Pockets of Hla-A2 in its Recognition by Cytotoxic T Lymphocytes Morrison, J., Elvin, J., Latron, F., Gotch, F., Moots, R., Strominger, J.L., Mcmichael, A. (1992) Eur J Immunol 22: 903
The Three-Dimensional Structure of Hla-B27 at 2.1 Angstroms Resolution Suggests a General Mechanism for Tight Peptide Binding to Mhc Madden, D.R., Gorga, J.C., Strominger, J.L., Wiley, D.C. (1992) Cell 70: 1035
Refined Structure of the Human Histocompatibility Antigen Hla-A2 at 2.6 Angstroms Resolution Saper, M.A., Bjorkman, P.J., Wiley, D.C. (1991) J Mol Biol 219: 277
Structure of the Human Class I Histocompatibility Antigen, Hla-A2 Bjorkman, P.J., Saper, M.A., Samraoui, B., Bennett, W.S., Strominger, J.L., Wiley, D.C. (1987) Nature 329: 506
The Foreign Antigen Binding Site and T Cell Recognition Regions of Class I Histocompatibility Antigens Bjorkman, P.J., Saper, M.A., Samraoui, B., Bennett, W.S., Strominger, J.L., Wiley, D.C. (1987) Nature 329: 512
Crystallization and X-Ray Diffraction Studies on the Histocompatibility Antigens Hla-A2 and Hla-A28 from Human Cell Membranes Bjorkman, P.J., Strominger, J.L., Wiley, D.C. (1985) J Mol Biol 186: 205
Organizational Affiliation:
Department of Biochemistry and Molecular Biology, Howard Hughes Medical Institute, Harvard University, Cambridge, Massachusetts 02138.
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