title: MHC recognition by hapten-specific HLA-A2-restricted CD8+ CTL.
abstract: T cell recognition by peptide-specific alphabeta TCRs involves not only recognition of the peptide, but also recognition of multiple molecular features on the surface of the MHC molecule to which the peptide has been bound. We have previously shown that TCRs that are specific for five different peptides presented by HLA-A2 recognize similar molecular features on the surface of the alpha1 and alpha2 helices of the HLA-A2 molecule. We next asked whether these same molecular features of the HLA-A2 molecule would be recognized by hapten-specific HLA-A2-restricted TCRs, given that hapten-specific T cells frequently show reduced MHC dependence/restriction. The results show that a panel of CD8+ CTL that are specific for the hapten DNP bound to two different peptides presented by HLA-A2 do the following: 1) show stringent MHC restriction, and 2) are largely affected by the same mutations on the HLA-A2 molecule that affected recognition by peptide-specific CTL. A small subset of this panel of CD8+ CTL can recognize a mutant HLA-A2 molecule in the absence of hapten. These data suggest that TCR recognition of a divergent repertoire of ligands presented by HLA-A2 is largely dependent upon common structural elements in the central portion of the peptide-binding site.
authors.affiliation: Molecular Immunology Section, Neuroimmunology Branch, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA.
authors.forename: Susan J
authors.initials: SJ
authors.lastname: Gagnon
authors.forename: Zichun
authors.initials: Z
authors.lastname: Wang
authors.forename: Richard
authors.initials: R
authors.lastname: Turner
authors.forename: Marale
authors.initials: M
authors.lastname: Damirjian
authors.forename: William E
authors.initials: WE
authors.lastname: Biddison
mesh_terms: D000409:Alanine / Q000235:genetics; D019943:Amino Acid Substitution / Q000235:genetics; D017951:Antigen Presentation / Q000235:genetics; D001216:Asparagine / Q000235:genetics; D002460:Cell Line; D002462:Cell Membrane / Q000276:immunology / Q000378:metabolism; D002478:Cells, Cultured; D003602:Cytotoxicity, Immunologic / Q000235:genetics; D004136:Dinitrobenzenes / Q000276:immunology / Q000378:metabolism / Q000494:pharmacology; D018984:Epitopes, T-Lymphocyte / Q000276:immunology* / Q000378:metabolism; D015234:HLA-A Antigens / Q000276:immunology; D015789:HLA-A2 Antigen / Q000235:genetics / Q000276:immunology* / Q000378:metabolism*; D006241:Haptens / Q000276:immunology* / Q000378:metabolism; D006801:Humans; D008239:Lysine / Q000235:genetics; D010446:Peptide Fragments / Q000276:immunology / Q000378:metabolism / Q000494:pharmacology; D011485:Protein Binding / Q000235:genetics / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology* / Q000378:metabolism*; D014162:Transfection
chemical_list: D004136:Dinitrobenzenes; D018984:Epitopes, T-Lymphocyte; D015234:HLA-A Antigens; C435939:HLA-A*02:01 antigen; D015789:HLA-A2 Antigen; D006241:Haptens; D010446:Peptide Fragments; D001216:Asparagine; D008239:Lysine; D000409:Alanine