title: Monoclonal antibodies directed against a cell surface-exposed outer membrane protein of Haemophilus influenzae type b.
abstract: Monoclonal antibodies directed against several different Haemophilus influenzae type b outer membrane proteins with apparent molecular weights of 45,000, 39,000, and 37,000 were identified by a radioimmunoprecipitation method. Five monoclonal antibodies, including both immunoglobulin G and M isotypes, were specific for the same H. influenzae type b major outer membrane protein (39,000 molecular weight). One of these immunoglobulin G monoclonal antibodies (6A2) was shown to be directed against a cell surface-exposed antigenic determinant of the 39,000-molecular-weight protein, whereas the other monoclonal antibodies directed against this same protein were apparently specific for antigenic determinants not exposed on the H. Influenzae type b cell surface. The cell surface-exposed protein antigenic determinant recognized by monoclonal antibody 6A2 was not unique to the H. influenzae type b strain used as the source of outer membrane vesicles for generating immune spleen cells, but was found in a majority of independently isolated strains of H. influenzae type b. These data indicate that there is antigenic cross-reactivity among H. influenzae type b strains with regard to cell surface-exposed proteins.
mesh_terms: D000911:Antibodies, Monoclonal / Q000032:analysis*; D000942:Antigens, Bacterial / Q000276:immunology; D001426:Bacterial Proteins / Q000276:immunology*; D003429:Cross Reactions; D000939:Epitopes; D006193:Haemophilus influenzae / Q000276:immunology*; D006825:Hybridomas; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D008565:Membrane Proteins / Q000276:immunology*; D008970:Molecular Weight; D013045:Species Specificity
chemical_list: D000911:Antibodies, Monoclonal; D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D000939:Epitopes; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D008565:Membrane Proteins