Molecular Genetics and Genomics

, Volume 279, Issue 3, pp 267–277

RpoS regulation of gene expression during exponential growth of Escherichia coli K12

Original Paper

Abstract

RpoS is a major regulator of genes required for adaptation to stationary phase in E. coli. However, the exponential phase expression of some genes is affected by rpoS mutation, suggesting RpoS may also have an important physiological role in growing cells. To test this hypothesis, we examined the regulatory role of RpoS in exponential phase using both genomic and biochemical approaches. Microarray expression data revealed that, in the rpoS mutant, the expression of 268 genes was attenuated while the expression of 24 genes was enhanced. Genes responsible for carbon source transport (the mal operon for maltose), protein folding (dnaK and mopAB), and iron acquisition (fepBD, entCBA, fecI, and exbBD) were positively controlled by RpoS. The importance of RpoS-mediated control of iron acquisition was confirmed by cellular metal analysis which revealed that the intracellular iron content of wild type cells was two-fold higher than in rpoS mutant cells. Surprisingly, many previously identified RpoS stationary-phase dependent genes were not controlled by RpoS in exponential phase and several genes were RpoS-regulated only in exponential phase, suggesting the involvement of other regulators. The expression of RpoS-dependent genes osmY, tnaA and malK was controlled by Crl, a transcriptional regulator that modulates RpoS activity. In summary, the identification of a group of exponential phase genes controlled by RpoS reveals a novel aspect of RpoS function.

Keywords

Regulation RpoS Microarray Stress response Exponential phase 

Supplementary material

438_2007_311_MOESM1_ESM.doc (148 kb)
(DOC 148 kb)
438_2007_311_MOESM2_ESM.xls (124 kb)
(XLS 124 kb)

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Tao Dong
    • 1
  • Mark G. Kirchhof
    • 2
  • Herb E. Schellhorn
    • 1
  1. 1.Department of BiologyMcMaster UniversityHamiltonCanada
  2. 2.Robarts Research Institute, Departments of Microbiology and Immunology, and Medicine, The FOCIS Center for Clinical Immunology and ImmunotherapeuticsUniversity of Western OntarioLondonCanada

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