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Salmonella Typhimurium growth on succinate is regulated by novel RpoS-independent systems. Key regulators include CspC, OxyS, IscR, and RbsR, revealing complex control over carbon metabolism during infection.

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Area of Science:

  • Microbiology
  • Bacterial Pathogenesis
  • Molecular Biology

Background:

  • Succinate acts as an immune signal in the gut and macrophages, infection niches for Salmonella Typhimurium.
  • Salmonella Typhimurium exhibits slow growth on succinate, a C4-dicarboxylate carbon source, with regulation involving the sigma factor RpoS.
  • The precise genetic mechanisms underlying succinate utilization repression in bacteria were not fully understood.

Purpose of the Study:

  • To investigate the genetic basis of growth inhibition in Salmonella Typhimurium when utilizing succinate as a sole carbon source.
  • To identify novel regulatory systems, beyond RpoS, that control succinate utilization.

Main Methods:

  • Employing an experimental evolution approach with Salmonella Typhimurium grown on succinate minimal medium.
  • Isolating and analyzing fast-growing mutants to uncover genetic basis of regulation.
  • Investigating the roles of specific proteins and regulatory RNAs in succinate metabolism.

Main Results:

  • Identified RpoS-independent systems that inhibit succinate utilization.
  • Discovered CspC RNA binding protein restricts succinate utilization, antagonized by OxyS sRNA.
  • Found IscR represses the DctA transporter, and RbsR is crucial for RpoS-mediated repression.

Conclusions:

  • Succinate utilization in Salmonella Typhimurium is controlled by multiple, redundant regulatory systems.
  • These findings reveal novel insights into the regulation of central carbon metabolism and its role in niche-specific adaptation.
  • The interplay of RpoS-dependent and -independent pathways provides tight control over succinate metabolism.