title: Specific antibodies to diphtheria toxin and type 6A pneumococcal capsular polysaccharide induced by a model of semi-synthetic glycoconjugate antigen.
abstract: A molecular model of a carbohydrate-protein conjugate is described, involving the non-toxic mutant protein CRM197, serologically related to the diphtheria toxin, covalently bound to a characterized oligosaccharide derived from the molecular structure of type 6A pneumococcal capsular polysaccharide. Physicochemical and immunochemical characteristics of this oligosaccharide-protein conjugate were consistent with a molecule showing a molar carbohydrate/protein ratio of 8, an av. mol. wt of 75,000, and retention of complete immunochemical identity when tested towards the homologous antisera. The immunological characteristics obtained after immunization of 2 animal models showed a high immunogenicity of the glycoconjugate specifically directed towards diphtheria toxin and the type 6A pneumococcal capsular polysaccharide.
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis*; D000918:Antibody Specificity; D000942:Antigens, Bacterial / Q000276:immunology*; D001426:Bacterial Proteins / Q000276:immunology; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004167:Diphtheria Toxin / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D006168:Guinea Pigs; D007122:Immunoelectrophoresis; D007074:Immunoglobulin G / Q000096:biosynthesis; D008970:Molecular Weight; D009844:Oligosaccharides / Q000276:immunology*; D011135:Polysaccharides, Bacterial / Q000276:immunology*; D011817:Rabbits; D013296:Streptococcus pneumoniae / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D004167:Diphtheria Toxin; D007074:Immunoglobulin G; D009844:Oligosaccharides; D011135:Polysaccharides, Bacterial; C028581:CRM197 (non-toxic variant of diphtheria toxin)