title: Monoclonal antibodies against the M-protein and carbohydrate antigens of histoplasmin characterized by the enzyme-linked immunoelectrotransfer blot method.
abstract: Monoclonal antibodies (MAbs) of two different specificities were produced by immunizing mice with the semipurified M antigen of histoplasmin. One type, from clone CB4, was an immunoglobulin M that precipitated a polysaccharide present in histoplasmin and also formed immunoprecipitates with a cross-reactive polysaccharide present in extracts of Blastomyces dermatitidis and Coccidioides immitis. The second type of MAb, from clone EC2, was an immunoglobulin G that reacted in the enzyme-linked immunoelectrotransfer blot (EITB) assay with a doublet of proteins with an apparent molecular size of 70 to 75 kilodaltons. This molecule is proposed as the authentic M protein antigen that is recognized by M antibodies in sera from mice and rabbits immunized with Histoplasma capsulatum and from persons with histoplasmosis. The M factor also occurs in an abundant disulfide-bridged dimer which has a molecular size of 150 kilodaltons and is nonimmunoreactive under the conditions of sodium dodecyl sulfate-polyacrylamide gel electrophoresis.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000946:Antigens, Fungal / Q000032:analysis*; D002241:Carbohydrates / Q000032:analysis* / Q000276:immunology; D004229:Dithiothreitol / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D005656:Fungal Proteins / Q000032:analysis* / Q000276:immunology; D006659:Histoplasmin / Q000032:analysis* / Q000276:immunology; D006801:Humans; D007124:Immunoenzyme Techniques; D007525:Isoelectric Focusing; D051379:Mice; D008807:Mice, Inbred BALB C; D010504:Periodic Acid / Q000494:pharmacology; D011233:Precipitin Tests
chemical_list: D000911:Antibodies, Monoclonal; D000946:Antigens, Fungal; D002241:Carbohydrates; D005656:Fungal Proteins; D010504:Periodic Acid; D006659:Histoplasmin; D004229:Dithiothreitol