Project description:The expression profile of an S. Typhimurium mutant strain unable to synthesise ppGpp (relAspoT deletions) was compared to the wild-type strain. The effect of ppGpp on virulence gene expression was studied under 4 different growth conditions that induce virulence gene expression. Keywords: genetic modification Study comprised 4 separate experiments (with 2 strains and 4 replicates for each strain per growth condition). The experiments were indirect comparisons using Salmonella genomic DNA as the comparator which also acted as the control for spot quality.
Project description:The expression profile of an S. Typhimurium mutant strain unable to synthesise ppGpp (relAspoT deletions) was compared to the wild-type strain. The effect of ppGpp on virulence gene expression was studied under 4 different growth conditions that induce virulence gene expression. Keywords: genetic modification
Project description:Obacunone is a limonoids present in Citrus species. We previously reported that obacunone was inhibitory to the cell-cell signaling in Vibrio harveyi and Escherichia coli O157:H7. In the present work we evaluated the effect of obacunone on the food borne pathogen Salmonella Typhimurium LT2 using cDNA microarray. The results demonstrate that obacunone exerts an antivirulence effect on S. Typhimurium LT2 by repressing SPI1 and SPI2. Furthermore, the effect of obacunone seems to be dependent upon EnvZ.
Project description:Transcriptional profiling of Salmonella Typhimurium SL1344 parental starin and isogenic M-bM-^HM-^FrelA, M-bM-^HM-^FspoT ppGpp null strain grown in LB medium with RNA samples talken at AD600=1.0 (mid log, ML), 2.3 (early stationary phase, ESP), 3.0 (mid stationary phase MSP) and 3.6 (Late stationary phase (LSP) Each array used labelled cDNA against a common genomic DNA reference. Triplicate biologically independent RNA samples were arrayed for each of the 2 strains at each of the 4 growth phases
Project description:Obacunone is a limonoids present in Citrus species. We previously reported that obacunone was inhibitory to the cell-cell signaling in Vibrio harveyi and Escherichia coli O157:H7. In the present work we evaluated the effect of obacunone on the food borne pathogen Salmonella Typhimurium LT2 using cDNA microarray. The results demonstrate that obacunone exerts an antivirulence effect on S. Typhimurium LT2 by repressing SPI1 and SPI2. Furthermore, the effect of obacunone seems to be dependent upon EnvZ. One condition experiment, obacunone treated versus DMSO treated. Biological replicates: 3 control, 3 treatment, hybridized in dye-swapped design
Project description:Investigation of whole genome gene expression level changes in a Salmonella enterica serovar Typhimurium UK1 delta-iacP mutant, compared to the wild-type strain. IacP is resoponsible for the secretion of virulence effector proteins via the type III secretion system, thereby contributing the virulence of S. Typhimurium. The mutants analyzed in this study are further described in Kim et al. 2011. Role of Salmonella Pathogenicity Island 1 Protein IacP in Salmonella enterica Serovar Typhimurium Pathogenesis. Infection and Immunity 79(4):1440-1450 (PMID 21263021).