title: Identification of the amino acid residues contributing to monoclonal antibody-defined DQw1 epitopes.
abstract: The reactivity of monoclonal antibodies (mAbs) R1, S1, and S5, shown previously to recognize polymorphic epitopes on HLA-DQ molecules, have been found to correlate with the presence of certain DQB1 alleles. mAb S5 reacts with cells expressing DQB1*0503, 0601, 0602, 0603, or 0604 alleles while R1 and S1 react with all DQB1 alleles except *0201 and 0301. In the case of R1 and S1, sequence comparison of these chains suggests the involvement of residues 45-47 (GVY) in formation of the epitopes. This prediction has been confirmed by showing that a G----E mutation in position 45 of the DQB1*0302 gene eliminates binding of both mAbs.
authors.affiliation: Institut für Immunologie, München, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Nordwig
authors.forename: W W
authors.initials: WW
authors.lastname: Kwok
authors.forename: J P
authors.initials: JP
authors.lastname: Johnson
mesh_terms: D000483:Alleles; D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D001666:Binding Sites, Antibody / Q000276:immunology; D000939:Epitopes / Q000276:immunology*; D006683:HLA-DQ Antigens / Q000276:immunology*; D059866:HLA-DQ beta-Chains; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D011110:Polymorphism, Genetic; D014162:Transfection; D014407:Tumor Cells, Cultured
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D006683:HLA-DQ Antigens; D059866:HLA-DQ beta-Chains; C051568:HLA-DQ1 antigen; C069051:HLA-DQB1 antigen