title: Expression of heterologous O-antigen in Yersinia pestis KIM does not affect virulence by the intravenous route.
abstract: All strains of Yersinia pestis examined have been found to lack an O-antigen. In other members of the Enterobacteriaceae, the rough phenotype often results in attenuation. However, Y. pestis is the aetiological agent of bubonic plague. In evolving from the ancestral enteropathogenic Yersinia pseudotuberculosis, and with the development of an arthropod-vectored systemic pathogenesis, smooth LPS production is not necessary for Y. pestis virulence and the metabolic burden has been alleviated by inactivation of the O-antigen biosynthetic operon. To investigate this, Y. pestis strain KIM D27 was transformed with a plasmid carrying the operon encoding the O-antigen of Yersinia enterocolitica O : 3. Expression of the O-antigen could be detected in silver-stained gels. The receptor for bacteriophage phiYeO3-12 has been shown to be O-antigen, and infection by this bacteriophage results in lysis of Y. enterocolitica O : 3. Expression of the O-antigen in Y. pestis conferred sensitivity to lysis by phiYeO3-12. The O-antigen-expressing clone was shown to be as virulent in mice by the intravenous route of challenge as the rough wild-type. Assays showed no alteration in the ability of Y. pestis to resist lysis by cationic antimicrobial peptides, serum or polymyxin.
authors.affiliation: Microbiology, DSTL, CBS Porton Down, Salisbury, Wiltshire SP4 0JQ, UK 2Department of Medical Biochemistry and Molecular Biology, Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, 20520 Turku, Finland.
authors.forename: P C F
authors.initials: PCF
authors.lastname: Oyston
authors.affiliation: Microbiology, DSTL, CBS Porton Down, Salisbury, Wiltshire SP4 0JQ, UK 2Department of Medical Biochemistry and Molecular Biology, Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, 20520 Turku, Finland.
authors.forename: J L
authors.initials: JL
authors.lastname: Prior
authors.affiliation: Microbiology, DSTL, CBS Porton Down, Salisbury, Wiltshire SP4 0JQ, UK 2Department of Medical Biochemistry and Molecular Biology, Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, 20520 Turku, Finland.
authors.forename: S
authors.initials: S
authors.lastname: Kiljunen
authors.affiliation: Microbiology, DSTL, CBS Porton Down, Salisbury, Wiltshire SP4 0JQ, UK 2Department of Medical Biochemistry and Molecular Biology, Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, 20520 Turku, Finland.
authors.forename: M
authors.initials: M
authors.lastname: Skurnik
authors.affiliation: Microbiology, DSTL, CBS Porton Down, Salisbury, Wiltshire SP4 0JQ, UK 2Department of Medical Biochemistry and Molecular Biology, Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, 20520 Turku, Finland.
authors.forename: J
authors.initials: J
authors.lastname: Hill
authors.affiliation: Microbiology, DSTL, CBS Porton Down, Salisbury, Wiltshire SP4 0JQ, UK 2Department of Medical Biochemistry and Molecular Biology, Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, 20520 Turku, Finland.
authors.forename: R W
authors.initials: RW
authors.lastname: Titball
mesh_terms: D000818:Animals; D001433:Bacteriolysis / Q000276:immunology; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D051379:Mice; D008807:Mice, Inbred BALB C; D019081:O Antigens / Q000096:biosynthesis* / Q000235:genetics; D010930:Plague / Q000382:microbiology*; D016622:Silver Staining; D014169:Transformation, Bacterial; D014774:Virulence; D015010:Yersinia pestis / Q000235:genetics / Q000276:immunology / Q000472:pathogenicity*
chemical_list: D019081:O Antigens