Dual regulation by phospho-OmpR of ssrA/B gene expression in Salmonella pathogenicity island 2

Xiuhong Feng, Ricardo Oropeza, Linda Kenney

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103 Scopus citations


Expression of genes located on Salmonella pathogenicity island 2 (SPI-2) is required for systemic infection in mice. This region encodes a type III secretion system, secreted effectors and the two-component regulatory system SsrA/B (also referred to as SpiR), as well as additional uncharacterized genes. In the present work, we demonstrate that phospho-OmpR (OmpR-P) functions as an activator at the spiC-ssrA/B locus. There are two promoters at spiR; one is upstream of ssrA and the other upstream of ssrB. Our results indicate that, in contrast to many two-component regulatory systems, regulation of the sensor kinase SsrA appears to be uncoupled and distinct from regulation of the response regulator SsrB. OmpR regulation of ssrA/B is one of only a few examples known in which a two-component response regulator directly regulates the expression of another two-component regulatory system.

Original languageEnglish (US)
Pages (from-to)1131-1143
Number of pages13
JournalMolecular Microbiology
Issue number4
StatePublished - May 1 2003
Externally publishedYes


ASJC Scopus subject areas

  • Molecular Biology
  • Microbiology

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