title: Mimotopes for alloreactive and conventional T cells in a peptide-MHC display library.
abstract: The use of peptide libraries for the identification and characterization of T cell antigen peptide epitopes and mimotopes has been hampered by the need to form complexes between the peptides and an appropriate MHC molecule in order to construct a complete T cell ligand. We have developed a baculovirus-based peptide library method in which the sequence encoding the peptide is embedded within the genes for the MHC molecule in the viral DNA, such that insect cells infected with virus encoding a library of different peptides each displays a unique peptide-MHC complex on its surface. We have fished in such a library with two different fluorescent soluble T cell receptors (TCRs), one highly peptide specific and the other broadly allo-MHC specific and hypothesized to be much less focused on the peptide portion of the ligand. A single peptide sequence was selected by the former alphabetaTCR that, not unexpectedly, was highly related to the immunizing peptide. As hypothesized, the other alphabetaTCR selected a large family of peptides, related only by a similarity to the immunizing peptide at the p5 position. These findings have implications for the relative importance of peptide and MHC in TCR ligand recognition. This display method has broad applications in T cell epitope identification and manipulation and should be useful in general in studying interactions between complex proteins.
authors.affiliation: Howard Hughes Medical Institute, Integrated Department of Immunology, National Jewish Medical and Research Center, Denver, Colorado, USA.
authors.forename: Frances
authors.initials: F
authors.lastname: Crawford
authors.forename: Eric
authors.initials: E
authors.lastname: Huseby
authors.forename: Janice
authors.initials: J
authors.lastname: White
authors.forename: Philippa
authors.initials: P
authors.lastname: Marrack
authors.forename: John W
authors.initials: JW
authors.lastname: Kappler
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000737:chemistry; D018122:B7-1 Antigen / Q000737:chemistry; D016367:Baculoviridae / Q000378:metabolism; D002460:Cell Line; D004279:DNA, Viral / Q000235:genetics; D000939:Epitopes / Q000737:chemistry; D018984:Epitopes, T-Lymphocyte / Q000737:chemistry; D005434:Flow Cytometry; D015723:Gene Library; D015395:Histocompatibility Antigens Class I / Q000737:chemistry; D006825:Hybridomas / Q000378:metabolism; D007313:Insecta; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism; D007376:Interleukin-2 / Q000378:metabolism; D008024:Ligands; D008285:Major Histocompatibility Complex; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D009841:Oligonucleotides / Q000737:chemistry; D019151:Peptide Library; D010455:Peptides / Q000737:chemistry; D011948:Receptors, Antigen, T-Cell / Q000378:metabolism; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D018122:B7-1 Antigen; D004279:DNA, Viral; D000939:Epitopes; D018984:Epitopes, T-Lymphocyte; D015395:Histocompatibility Antigens Class I; D007376:Interleukin-2; D008024:Ligands; D009841:Oligonucleotides; D019151:Peptide Library; D010455:Peptides; D011948:Receptors, Antigen, T-Cell; D018799:Intercellular Adhesion Molecule-1