title: Bacterial phenotypes mediated by mviA and their relationship to the mouse virulence of Salmonella typhimurium.
abstract: The focus of this study was the phenotypic characterization of Salmonella typhimurium mutants lacking the function of the response regulator mviA. The inactivation of mviA+ (mviA::kan) is shown to induce a significant change in the growth of most virulent strains, as reflected in the size of the colonies formed on agar plates. The colony phenotype observed in these strains has been designated as the small colony morphology (Scm+) phenotype. Mutants exhibiting the Scm+ phenotype are shown to be significantly attenuated for virulence in susceptible (ItyB) mice. The Scm+ phenotype therefore provides an in vitro phenotypic marker for mviA+ activity. Further examination of Scm+ mutants has revealed that they lack expression of a 55 kDa periplasmic protein which is detected in isogenic mviA+ strains. This protein has been designated mviA+ related protein A (MrpA) and was expressed in direct correlation with virulence in all S. typhimurium strains examined.
authors.affiliation: Department of Pathology, University of Alabama at Birmingham 35294-0007, USA.
authors.forename: W E
authors.initials: WE
authors.lastname: Swords
authors.forename: A
authors.initials: A
authors.lastname: Giddings
authors.forename: W H
authors.initials: WH
authors.lastname: Benjamin
mesh_terms: D000818:Animals; D001426:Bacterial Proteins / Q000235:genetics* / Q000502:physiology; D003593:Cytoplasm / Q000378:metabolism; D005798:Genes, Bacterial; D051379:Mice; D008807:Mice, Inbred BALB C; D009154:Mutation; D010641:Phenotype; D012486:Salmonella typhimurium / Q000235:genetics* / Q000472:pathogenicity*; D014774:Virulence
chemical_list: D001426:Bacterial Proteins