title: THE IDENTIFICATION AND ISOLATION OF TWO MOUSE-TOXIC PROTEIN COMPONENTS IN EXTRACTS FROM PASTEURELLA PESTIS.
abstract: The toxin activity of Pasteurella pestis cells, strain "Tjiwidej," was found to be associated with two proteins. Using a disc electrophoresis technique in conjunction with mouse lethality, two toxic proteins were isolated exhibiting intraperitoneal LD(50)'s of less than 1.0 to 1.5 microg protein. Each produced a single characteristic precipitin band on agar gel diffusion plates. The slower migrating toxin in gel diffusion or disc electrophoresis was designated as toxin A. It was shown to be sensitive to deoxycholate and digitonin, did not accumulate in 5-fluorotryptophan treated cells, and was associated with the membrane fraction of the cell. The faster migrating toxin B, apparently is resistant to surface-active agents, and is not affected by treatment of cells with 5-fluorotryptophan. Toxin B is associated with the soluble or cytoplasmic fraction of the cell. This evidence suggested that each toxin represented a distinctly different molecular species. The possibility is discussed that toxin B is synonymous with the murine toxin previously isolated by paper curtain electrophoresis which revealed only one antigen band in the Oudin precipitin reaction.
mesh_terms: D000818:Animals; D000992:Antitoxins; D001426:Bacterial Proteins; D001647:Bile Acids and Salts; D003593:Cytoplasm; D004586:Electrophoresis; D005779:Immunodiffusion; D051379:Mice; D011506:Proteins; D012106:Research; D012492:Salts; D012503:Saponins; D013501:Surface-Active Agents; D014116:Toxicology; D014118:Toxins, Biological; D014364:Tryptophan / Q000031:analogs & derivatives; D015010:Yersinia pestis
chemical_list: D000992:Antitoxins; D001426:Bacterial Proteins; D001647:Bile Acids and Salts; D011506:Proteins; D012492:Salts; D012503:Saponins; D013501:Surface-Active Agents; D014118:Toxins, Biological; C026927:5-fluorotryptophan; D014364:Tryptophan
keywords: BACTERIAL PROTEINS; BILE ACIDS AND SALTS; ELECTROPHORESIS; EXPERIMENTAL LAB STUDY; GEL DIFFUSION TESTS; PASTEURELLA PESTIS; SAPONINS; SURFACE-ACTIVE AGENTS; TOXICOLOGIC REPORT; TOXINS AND ANTITOXINS; TRYPTOPHAN