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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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sRNA-mediated RNA processing regulates bacterial cell division.

Julian Grützner1, Bernhard Remes1, Katrin M H Eisenhardt1

  • 1Institute of Microbiology and Molecular Biology, University of Giessen, Heinrich-Buff-Ring 26-32, D-35392 Giessen, Germany.

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Summary
This summary is machine-generated.

The small non-coding RNA StsR regulates cell division in Rhodobacter sphaeroides, linking environmental cues to growth. A mutant lacking StsR shows altered entry into stationary phase and faster resumption of growth.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Gene Regulation

Background:

  • Cell division control is crucial for organism survival.
  • Regulatory mechanisms for prokaryotic cell division remain largely uncharacterized.
  • Small non-coding RNAs (sRNAs) are emerging as key regulators in bacteria.

Purpose of the Study:

  • To investigate the role of the sRNA StsR in cell division and growth regulation in Rhodobacter sphaeroides.
  • To elucidate the regulatory network involving StsR and its targets.
  • To understand how environmental cues influence bacterial cell division.

Main Methods:

  • Analysis of a Rhodobacter sphaeroides mutant lacking the StsR sRNA.
  • Identification of StsR targets, including the sRNA UpsM and the division and cell wall (dcw) gene cluster mRNA.
  • Investigation of sRNA-sRNA and sRNA-mRNA interactions.
  • Assessment of ribonuclease RNase E activity and its role in the regulatory pathway.

Main Results:

  • StsR is induced by stress and stationary phase via alternative sigma factors RpoHI/HII.
  • StsR regulates the abundance of dcw mRNAs by interacting with UpsM and the dcw mRNA 5' UTR.
  • These interactions trigger RNase E-mediated cleavage, impacting cell growth.
  • The StsR mutant exhibits delayed entry into stationary phase and faster post-stationary growth resumption.

Conclusions:

  • StsR acts as a critical regulator of cell division and growth in Rhodobacter sphaeroides.
  • StsR provides a regulatory link between environmental conditions and bacterial proliferation.
  • sRNA-mediated regulation, involving interactions with other sRNAs and mRNAs, is vital for bacterial adaptation.