title: A new monoclonal antibody recognizing a linear determinant on the HLA-DRalpha chain N-terminus.
abstract: We report the generation of a monoclonal antibody (MAb) that reacts to the N-terminus of the denatured HLA-DRalpha chain. The 1C4.6 MAb was raised against a peptide corresponding to amino acid residues 10 to 32 of a highly conserved region within the alpha1 domain of HLA-DR. This region partially overlaps with the epitope recognized by the conformationally dependent L243 MAb. In Western blot analysis, MAb 1C4.6 reacted with denatured HLA-DRalpha chains, but failed to bind the HLA-DRbeta chain expressed individually by transfectant cells, confirming that it recognizes an epitope on the alpha-chain of HLA-DR. In addition, this antibody was found to be isotype specific to HLA-DRalpha, as it did not cross-react to HLA class II proteins HLA-DP and-HLA-DQ. The 1C4.6 MAb is a valuable addition to existing reagents used to probe the structure and function of MHC class II molecules. This anti-HLA-DRalpha1 domain MAb may prove valuable for studies of HLA class II heterodimer assembly, structure, and function, as well as for studies into the release of soluble MHC class II.
authors.affiliation: Department of Microbiology and Immunology, University of Otago, Dunedin, New Zealand.
authors.forename: Yi Tian
authors.initials: YT
authors.lastname: Ting
authors.forename: Sebastian
authors.initials: S
authors.lastname: Temme
authors.forename: Norbert
authors.initials: N
authors.lastname: Koch
authors.forename: Alexander D
authors.initials: AD
authors.lastname: McLellan
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis* / Q000276:immunology*; D015153:Blotting, Western; D045744:Cell Line, Tumor; D004797:Enzyme-Linked Immunosorbent Assay; D000939:Epitopes / Q000235:genetics / Q000378:metabolism; D005434:Flow Cytometry; D006684:HLA-DR Antigens / Q000276:immunology*; D006801:Humans; D006825:Hybridomas / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D006684:HLA-DR Antigens