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Using Microtiter Dish Radiolabeling for Multiple In Vivo Measurements Of Escherichia coli pppGpp Followed by Thin Layer Chromatography
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Triggering the stringent response: signals responsible for activating (p)ppGpp synthesis in bacteria.

Sophie E Irving1, Rebecca M Corrigan1

  • 1Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, S10 2TN, UK.

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Summary

The bacterial stringent response, mediated by alarmones (p)ppGpp, helps bacteria survive nutritional stress. Diverse RSH enzymes regulate this crucial pathway, impacting gene expression across species.

Keywords:
RSHRelAbacterial signalling pathwayppGppregulationstringent response

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • The stringent response is a vital bacterial stress survival mechanism.
  • It is regulated by alarmones, guanosine polyphosphates (p)ppGpp.
  • These alarmones are synthesized and hydrolyzed by the ubiquitous RSH enzyme superfamily.

Purpose of the Study:

  • To provide an overview of the regulatory mechanisms governing the bacterial stringent response.
  • To highlight the diversity in transcriptional and post-translational regulation of RSH enzymes.
  • To offer insights into the biological roles of this signaling pathway.

Main Methods:

  • Literature review of RSH enzyme superfamily and stringent response regulation.
  • Comparative analysis of regulatory mechanisms across bacterial species.
  • Synthesis of current knowledge on (p)ppGpp signaling networks.

Main Results:

  • The RSH superfamily comprises long-RSH, small alarmone synthetases (SAS), and small alarmone hydrolases (SAH).
  • (p)ppGpp accumulation globally alters gene expression in response to nutritional stress.
  • Significant differences exist in RSH enzyme regulation between Gram-negative and Gram-positive bacteria.

Conclusions:

  • Understanding RSH enzyme regulation is key to deciphering the stringent response.
  • This pathway plays diverse and crucial roles in bacterial survival and adaptation.
  • Further research into these regulatory mechanisms can reveal novel targets for antimicrobial strategies.