title: Sequence restrictions in T cell receptor beta-chains that have specificity for a self-peptide/Ld complex.
abstract: Cytotoxic T lymphocytes that react with a complex of Ld and a ubiquitous self-peptide derived from the enzyme alpha-ketoglutarate dehydrogenase (p2Ca, LSPFPFDL) can be readily elicited by the addition of synthetic peptide to cultures of BALB/c spleen cells. As with other Ld-restricted CTL, the p2Ca-specific cells use predominantly the V beta 8.3 region. In addition, the p2Ca-specific cells use almost exclusively one of three J beta gene segments. Selection for these J beta regions appears to be related to the presence of a glutamic acid residue that is encoded at the 5' end of the J beta and is present within the CDR3. As p2Ca does not contain a complementary charged residue, this finding may suggest that the beta-chain CDR3 from p2Ca-specific CTL contacts one of the five basic residues located on the Ld helices. Together, the results support the possibility that CDR1 and/or CDR2 (within V beta 8.3) and the CDR3 may each contact the Ld molecule. In contrast to the V beta and J beta regions, the V beta D beta J beta junctions and V alpha J alpha repertoires were diverse. The diversity could explain why p2Ca-specific CTL have relatively high precursor frequencies allowing them to be generated rapidly in primary cultures.
authors.affiliation: Department of Biochemistry, University of Illinois, Urbana 61801.
authors.forename: B A
authors.initials: BA
authors.lastname: Tjoa
authors.forename: D M
authors.initials: DM
authors.lastname: Kranz
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D000939:Epitopes / Q000276:immunology; D006183:H-2 Antigens / Q000276:immunology*; D064532:Histocompatibility Antigen H-2D; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D009842:Oligopeptides / Q000276:immunology*; D017260:Receptor-CD3 Complex, Antigen, T-Cell / Q000276:immunology; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*
chemical_list: D000939:Epitopes; D006183:H-2 Antigens; D064532:Histocompatibility Antigen H-2D; D009842:Oligopeptides; D017260:Receptor-CD3 Complex, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta; C088354:p2Ca peptide