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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
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RNA G-Quadruplex Structures Mediate Gene Regulation in Bacteria.

Xiaolong Shao1, Weitong Zhang1, Mubarak Ishaq Umar2

  • 1Department of Biomedical Sciences, City University of Hong Kong, Kowloon Tong, Hong Kong SAR, China.

Mbio
|January 23, 2020
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Summary

RNA G-quadruplexes (rG4s) are abundant in bacteria, regulating virulence and metabolism. This study confirms their presence and function in prokaryotes, opening new avenues for research.

Keywords:
RNA G-quadruplexes (rG4)bacteriagene regulationnucleic acid structuresprokaryotestranscriptome-wide

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Area of Science:

  • Molecular Biology
  • Genomics
  • Microbiology

Background:

  • RNA G-quadruplexes (rG4s) are known to regulate biological functions in eukaryotes.
  • The existence, location, and roles of rG4s in prokaryotes remain largely unknown.
  • Investigating bacterial rG4s is crucial for understanding prokaryotic gene regulation and pathogenicity.

Purpose of the Study:

  • To determine the prevalence and distribution of rG4 structures in diverse bacterial species.
  • To identify and characterize functional rG4 sites within bacterial transcriptomes.
  • To elucidate the regulatory roles of bacterial rG4s in key cellular processes, including virulence and metabolism.

Main Methods:

  • Utilized QUMA-1, an rG4-specific fluorescent probe, for detection in vitro and in live bacterial cells.
  • Employed transcriptome-wide RNA G-quadruplex sequencing (rG4-seq) in *Escherichia coli* and *Pseudomonas aeruginosa*.
  • Performed biophysical assays, genetic manipulations (point mutation, lux reporter assays), and phenotypic analyses for functional validation.

Main Results:

  • rG4 structures were found to be abundant across a wide range of bacterial species.
  • Identified 168 and 161 in vitro rG4 sites in *E. coli* and *P. aeruginosa*, respectively.
  • rG4-containing genes are implicated in bacterial virulence, gene regulation, cell envelope synthesis, and metabolism; functional validation of *hemL* and *bswR* rG4s confirmed their roles.

Conclusions:

  • RNA G-quadruplexes are prevalent and functionally significant structures in bacteria.
  • Bacterial rG4s play critical regulatory roles in pathogenicity and metabolic pathways.
  • This study provides substantial evidence for the formation and function of rG4s in prokaryotes, highlighting their importance.