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Updated: Jun 26, 2026

Studying Ribonucleotide Incorporation: Strand-specific Detection of Ribonucleotides in the Yeast Genome and Measuring Ribonucleotide-induced Mutagenesis
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RNA decay by messenger RNA interferases

Mikkel Christensen-Dalsgaard1, Martin Overgaard, Kristoffer Skovbo Winther

  • 1Institute for Cell and Molecular Biosciences, Medical School, University of Newcastle, Newcastle, United Kingdom.

Methods in Enzymology
|January 24, 2009
PubMed

Insights

This study details methods for producing and analyzing mRNA-cleaving enzymes like RelE from Escherichia coli. These enzymes, part of toxin-antitoxin systems, inhibit bacterial growth by stopping translation.

Area of Science:

  • Molecular Biology
  • Bacteriology
  • Genetics

Background:

  • Toxin-antitoxin (TA) systems, including relBE and mazEF, are abundant in bacteria.
  • These systems encode mRNA-cleaving enzymes that inhibit translation and induce bacteriostasis.
  • Understanding these enzymes is crucial for controlling bacterial growth.

Purpose of the Study:

  • To describe protocols for overproduction, purification, and analysis of mRNA-cleaving enzymes.
  • To provide methods for studying RelE of Escherichia coli and its antitoxin RelB.
  • To present plasmid vectors for detailed cleavage site analysis in model mRNAs.

Main Methods:

  • Overproduction and purification of mRNA-cleaving enzymes.
  • Analysis of enzyme activity on model mRNAs.
  • Utilizing specific plasmid vectors for cleavage site mapping.

Main Results:

  • Established protocols for obtaining functional RelE and RelB proteins.
  • Demonstrated the utility of developed plasmid vectors for site-specific analysis.
  • Provided a framework for studying mRNA cleavage mechanisms in TA systems.

Conclusions:

  • The described protocols facilitate in-depth study of bacterial mRNA-cleaving enzymes.
  • This work aids in understanding the bacteriostatic mechanisms of TA systems.
  • The developed tools are valuable for research on bacterial gene regulation and antibiotic development.

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