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sRNA-controlled iron sparing response in Staphylococci.

Rodrigo H Coronel-Tellez1, Mateusz Pospiech2, Maxime Barrault1

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This summary is machine-generated.

A novel small RNA, IsrR, helps Staphylococcus aureus survive iron scarcity by regulating essential enzymes. This discovery highlights RNA

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Pathogenesis

Background:

  • Staphylococcus aureus adapts its metabolism to survive iron-limited conditions within a host.
  • Small non-coding RNAs (sRNAs) are investigated for their role in regulating bacterial responses to nutrient availability.
  • Iron homeostasis is crucial for bacterial survival and virulence.

Purpose of the Study:

  • To identify and characterize small non-coding RNAs involved in Staphylococcus aureus iron-deprivation response.
  • To elucidate the regulatory mechanism of the identified sRNA, IsrR, on target gene expression.
  • To assess the in vivo significance of IsrR in bacterial pathogenesis.

Main Methods:

  • Competition assays with tagged-mutant libraries to identify iron-regulated sRNAs.
  • RNA sequencing and bioinformatics analysis to predict sRNA targets.
  • Reporter assays and mutational analysis to validate IsrR targets and regulatory mechanisms.
  • In vivo studies using a mouse septicemia model to evaluate the role of IsrR in virulence.

Main Results:

  • A novel iron-repressed sRNA, IsrR, was identified and found to be essential during iron starvation.
  • IsrR was demonstrated to down-regulate the translation of mRNAs encoding iron-containing enzymes, including those involved in anaerobic nitrate respiration.
  • Mutational analysis revealed differential contributions of C-rich regions within IsrR to target regulation.
  • IsrR plays a significant role in Staphylococcus aureus lethality in a mouse septicemia model, indicating its importance in the iron-sparing response.

Conclusions:

  • IsrR is a key regulator of the iron-sparing response in Staphylococcus aureus, crucial for bacterial survival during infection.
  • The distinct sRNA IsrR, though not orthologous to other known sRNAs, regulates common targets, showcasing convergent evolution in RNA-based regulatory strategies for bacterial fitness under iron scarcity.
  • IsrR represents a potential therapeutic target for combating Staphylococcus aureus infections by disrupting its iron acquisition and utilization mechanisms.