title: A novel HLA-A determinant recognized by a cytotoxic human hybridoma IgG1 monoclonal antibody (TrJ14).
abstract: TrJ14 is a cytotoxic human IgG1 lambda hybridoma mAb that recognized a novel HLA-A epitope expressed by lymphoblastoid B cells that are homo- or heterozygous for A2, A3, A11, A30, A31, A33, A68 and A69. Based on these results, the HLA type of cell line TEM (10w9057) was retyped as A66. When peripheral blood T cells isolated freshly from 265 HLA-typed normal individuals served as targets, TrJ14 killed cells expressing two TrJ14-positive HLA-A alleles, as well as the majority of cells having one TrJ14-positive and one TrJ14-negative HLA-A antigen. However, TrJ14 failed to recognize or reacted weakly with most HLA-A2 and -A3 heterozygous normal T cells when A2 or A3 was coexpressed together with a TrJ14-negative antigen. The serological reactivity of TrJ14 correlated with the amino acid valine and aspartic acid at positions 76 and 77 of the alpha 1-domain helix. These amino acids were shared exclusively by all the identified TrJ14+ alleles.
authors.affiliation: Department of Immunology, University of Tromsø, School of Medicine, Norway.
authors.forename: J
authors.initials: J
authors.lastname: Ge
authors.forename: A
authors.initials: A
authors.lastname: Bratlie
authors.forename: K
authors.initials: K
authors.lastname: Hannestad
mesh_terms: D000595:Amino Acid Sequence; D000911:Antibodies, Monoclonal / Q000276:immunology*; D002460:Cell Line; D003601:Cytotoxicity Tests, Immunologic; D000939:Epitopes / Q000276:immunology*; D005434:Flow Cytometry; D015234:HLA-A Antigens / Q000276:immunology*; D006801:Humans; D006825:Hybridomas / Q000276:immunology*; D007074:Immunoglobulin G / Q000276:immunology*; D008214:Lymphocytes / Q000276:immunology; D008969:Molecular Sequence Data
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D015234:HLA-A Antigens; D007074:Immunoglobulin G