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CsrA and Cra influence Shigella flexneri pathogenesis.

Aja L Gore1, Shelley M Payne

  • 1Institute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712, USA.

Infection and Immunity
|August 18, 2010
PubMed
Summary
This summary is machine-generated.

Shigella flexneri virulence relies on carbon metabolism regulation. Disrupting glycolysis regulators (CsrA, pfkA) impairs invasion by affecting virulence gene expression.

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Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Molecular Biology

Background:

  • Shigella flexneri invades the colonic epithelium, requiring adaptation to host nutrient availability.
  • Carbon metabolism regulators, CsrA and Cra, influence bacterial survival and virulence.

Purpose of the Study:

  • To investigate the roles of CsrA and Cra in Shigella flexneri virulence.
  • To determine the impact of glycolysis on bacterial invasion and plaque formation.

Main Methods:

  • Utilized a cell culture model to study S. flexneri virulence.
  • Generated and analyzed csrA, cra, and pfkA mutants.
  • Assessed bacterial attachment, invasion, plaque formation, and expression of virulence factors (virF, virB, Ipa).

Main Results:

  • csrA and pfkA mutants showed decreased attachment and invasion, while cra mutants exhibited increased invasion.
  • Both csrA and pfkA mutants were defective in plaque formation.
  • Loss of invasion in csrA and pfkA mutants correlated with reduced expression of virF, virB, and Ipa.

Conclusions:

  • Carbon metabolism regulation, particularly involving CsrA and the glycolysis gene pfkA, is critical for S. flexneri virulence.
  • Both glycolytic and gluconeogenic pathways impact bacterial invasion and plaque formation.
  • Virulence gene regulator synthesis (VirF, VirB) is linked to carbon metabolism and glycolysis.