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The BosR Is Back!

D Scott Samuels1, Meghan C Lybecker2

  • 1Division of Biological and Biomedical Sciences, University of Montana, Missoula, Montana, USA.

Molecular Microbiology
|January 2, 2026
PubMed
Summary
This summary is machine-generated.

BosR, a key regulator in Lyme disease bacteria Borrelia burgdorferi, controls gene expression through DNA and RNA binding. This study defines its broad regulatory role in the host, independent of RpoS, impacting bacterial survival.

Keywords:
Borrelia (Borreliella) burgdorferiDNA bindingRNA bindingferric uptake regulator (FUR)gene regulation

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • BosR is a nucleic acid-binding protein in the ferric uptake regulator (FUR) family, crucial for gene regulation in Borrelia burgdorferi.
  • BosR has been primarily linked to the regulation of RpoS, the alternative sigma factor essential for vertebrate infection establishment.
  • The study investigates the broader regulatory functions of BosR beyond its known role in RpoS regulation.

Purpose of the Study:

  • To comprehensively define the regulatory scope of BosR in the vertebrate host of B. burgdorferi using transcriptomic analysis.
  • To elucidate BosR's RpoS-independent regulatory mechanisms.
  • To clarify BosR's role in bacterial adaptation and persistence in different environments.

Main Methods:

  • Comprehensive transcriptomic analysis to identify BosR-regulated genes.
  • Investigation of BosR's regulatory mechanisms, including RpoS-dependent and independent pathways.
  • Assessment of BosR's role in oxidative and nitrosative stress defense.

Main Results:

  • BosR regulates a wide array of genes in B. burgdorferi through both RpoS-dependent and independent mechanisms.
  • BosR does not play a significant role in the defense against oxidative and nitrosative stress in the vertebrate host.
  • The study highlights BosR's function as an RNA-binding protein with RNA chaperone activity, influencing post-transcriptional gene regulation.

Conclusions:

  • BosR is a major regulator of gene expression in B. burgdorferi, controlling diverse cellular functions.
  • BosR plays a critical role in the spirochete's ability to transition between tick and vertebrate hosts and persist in these environments.
  • Understanding BosR's multifaceted regulatory roles is crucial for comprehending B. burgdorferi pathogenesis and host adaptation.