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Related Experiment Video

Updated: Jun 13, 2025

Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis
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Diribonuclease activity eliminates toxic diribonucleotide accumulation.

Soo-Kyoung Kim1, Mona W Orr2, Husan Turdiev2

  • 1Department of Cell Biology and Molecular Genetics, University of Maryland at College Park, College Park, MD 20742, USA; Research Institute for Drug Development, Pusan National University, Busan 46241, South Korea.

Cell Reports
|September 14, 2024
PubMed
Summary

Diribonucleases, like RNase AM, prevent toxic buildup of diribonucleotides. This RNA degradation monitoring mechanism is conserved across bacteria and eukaryotes.

Keywords:
CP: Molecular biologyRNA degradationRNase AMYciVdiribonucleasediribonucleotidesessentialitylinearoligoribonuclease

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Area of Science:

  • Molecular Biology
  • Microbiology
  • Biochemistry

Background:

  • RNA degradation is crucial for gene regulation, involving the breakdown of diribonucleotides into mononucleotides by diribonucleases.
  • In Escherichia coli, oligoribonuclease (Orn) is essential for this process, but its absence in Pseudomonas aeruginosa suggests alternative mechanisms exist.

Purpose of the Study:

  • To investigate the role of diribonucleases in bacterial RNA degradation and identify functional equivalents of Orn in other bacteria.
  • To understand the conservation of RNA degradation monitoring mechanisms across different organisms.

Main Methods:

  • Genetic screening of Pseudomonas aeruginosa orn mutants to identify suppressor mutations.
  • Biochemical characterization of purified YciV (RNase AM) for diribonuclease activity.
  • Phylogenetic analysis of RNase AM across γ-proteobacteria.
  • Functional expression of RNase AM in Escherichia coli.

Main Results:

  • The gene yciV was identified as a suppressor in P. aeruginosa orn mutants, and its product, RNase AM, was confirmed to have diribonuclease activity.
  • Phylogenetic analysis revealed variations in RNase AM active sites across γ-proteobacteria.
  • Expression of RNase AM from P. aeruginosa in E. coli rendered the orn gene non-essential, preventing toxic diribonucleotide accumulation.

Conclusions:

  • Diribonuclease activity is essential for preventing toxic diribonucleotide accumulation in γ-proteobacteria, serving as a conserved RNA degradation efficacy monitoring system.
  • The findings suggest a conserved mechanism for monitoring RNA degradation, extending from bacteria to higher eukaryotes that encode Orn.