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• W2022874528 endingPage "982" @default.
• W2022874528 startingPage "971" @default.
• W2022874528 abstract "SirA of Salmonella typhimurium is known to regulate the hilA and prgH genes within Salmonella pathogenicity island 1 (SPI1). To identify more members of the SirA regulon, we screened 10,000 random lacZY fusions (chromosomal MudJ insertions) for regulation by SirA and identified 10 positively regulated fusions. Three fusions were within the SPI1 genes hilA (an SPI1 transcriptional regulator), spaS (a component of the SPI1 type III export apparatus) and sipB (a substrate of the SPI1 export apparatus). Two fusions were within the sopB gene (also known as sigD). sopB is located within SPI5, but encodes a protein that is exported via the SPI1 export apparatus. In addition, five fusions were within genes of unknown function that are located in SPI4. As spaS and sipB were likely to be hilA dependent, we tested all of the fusions (except hilA) for hilA dependence. Surprisingly, we found that all of the fusions require hilA for expression and that plasmid-encoded SirA cannot bypass this requirement. Therefore, SirA regulates hilA, the product of which regulates genes within SPI1, SPI4 and SPI5. Both sirA and hilA mutants are dramatically attenuated in a bovine model of gastroenteritis, but have little or no effect in the mouse model of typhoid fever. This study establishes the SirA/HilA regulatory cascade as the primary regulon controlling enteropathogenic virulence functions in S. typhimurium. Because S. typhimurium causes gastroenteritis in both cattle and humans, we believe that this information may be directly applicable to the human disease." @default.
• W2022874528 created "2016-06-24" @default.
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• W2022874528 date "1999-02-01" @default.
• W2022874528 modified "2023-09-27" @default.
• W2022874528 title "Salmonella SirA is a global regulator of genes mediating enteropathogenesis" @default.
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• W2022874528 doi "https://doi.org/10.1046/j.1365-2958.1999.01244.x" @default.
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