title: Characterization of a protective protein antigen of Erysipelothrix rhusiopathiae.
abstract: Although vaccination is widely practiced against infection by Erysipelothrix rhusiopathiae in pigs and turkeys, the protective antigen(s) involved have not been fully characterized or purified to homogeneity. Antigens of E. rhusiopathiae strain T28, serotype 2b, and of FRANKFURT XI, serotype N, in culture supernatant and in extracts made with hot acid, 10 mM NaOH, ultrasound or EDTA were compared by SDS-PAGE and immunoblotting and in a mouse protection test. EDTA and 10 mM NaOH yielded highly protective extracts; culture supernatant was less protective and ultrasonic or hot acid extracts stimulated little or no protection in mice. Protective antisera from swine, horses and mice recognized prominent bands of molecular mass (m.m.) of 66-64 and 40-39 kDa in EDTA and 10 mM NaOH extracts. Mice immunized with preparations of the 66-64 kDa band purified by preparative electrophoresis were protected. Both antigens were trypsin sensitive, contained no detectable polysaccharide, and showed a marked tendency to aggregate in the absence of SDS.
authors.affiliation: Department of Microbiology, Immunology and Parasitology, NYSCVM, Cornell University, Ithaca 14850.
authors.forename: M H
authors.initials: MH
authors.lastname: Groschup
authors.forename: K
authors.initials: K
authors.lastname: Cussler
authors.forename: R
authors.initials: R
authors.lastname: Weiss
authors.forename: J F
authors.initials: JF
authors.lastname: Timoney
mesh_terms: D000818:Animals; D000942:Antigens, Bacterial / Q000032:analysis / Q000276:immunology*; D001428:Bacterial Vaccines; D004492:Edetic Acid; D004591:Electrophoresis, Polyacrylamide Gel; D004888:Erysipelothrix / Q000276:immunology*; D004889:Erysipelothrix Infections / Q000517:prevention & control*; D006736:Horses; D007106:Immune Sera / Q000276:immunology; D015151:Immunoblotting; D051379:Mice; D012972:Sodium Hydroxide; D013552:Swine; D014465:Ultrasonics; D014611:Vaccination / Q000662:veterinary
chemical_list: D000942:Antigens, Bacterial; D001428:Bacterial Vaccines; D007106:Immune Sera; D012972:Sodium Hydroxide; D004492:Edetic Acid