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Control of Salmonella pathogenicity island-2 gene expression Fass E; Groisman EACurr Opin Microbiol 2009[Apr]; 12 (2): 199-204The Salmonella Pathogenicity Island-2 (i.e. SPI-2) encodes a unique type III secretion system that delivers effector proteins from the Salmonella-containing vacuole (SCV) into the host cell. The SPI-2 locus also encodes translocated effectors as well as a two-component system - termed SpiR/SsrB - that is essential for the expression of SPI-2 genes. Transcription of the horizontally acquired SPI-2 genes requires the ancestral nucleoid-associated proteins (i.e. NAPs) IHF and Fis, the regulatory protein SlyA, and the two-component systems PhoP/PhoQ and OmpR/EnvZ, as well as the DNA binding protein HilD encoded in a different pathogenicity island. Some of these positive SPI-2 regulators act to antagonize the robust silencing promoted by the NAPs H-NS, Hha, and YdgT.|*Gene Expression Regulation, Bacterial[MESH]|Bacterial Proteins/genetics/*metabolism[MESH]|Membrane Proteins/genetics/*metabolism[MESH]|Transcription Factors/*metabolism[MESH] |
