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Ribonuclease E is a 5'-end-dependent endonuclease

G A Mackie1

  • 1Department of Biochemistry & Molecular Biology, University of British Columbia, Vancouver, Canada. gamackie@unixg.ubc.ca

Nature
|October 28, 1998
PubMed
Summary

Ribonuclease E (RNase E) activity is directed by the 5' end of messenger RNAs (mRNAs), explaining mRNA decay direction in E. coli. This enzyme prefers 5' monophosphorylated substrates, influencing mRNA stability.

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Area of Science:

  • Molecular Biology
  • Microbiology
  • Biochemistry

Background:

  • Messenger RNA (mRNA) degradation is crucial for cellular regulation.
  • Ribonuclease E (RNase E) initiates mRNA decay in Escherichia coli but lacks sequence specificity.
  • The 5'-to-3' directionality of mRNA decay is not fully explained by RNase E's known properties.

Purpose of the Study:

  • To investigate the factors determining the directionality of mRNA degradation by RNase E.
  • To understand how RNase E's activity is regulated in Escherichia coli.

Main Methods:

  • Preparation of covalently closed circular mRNA derivatives.
  • Assays using antisense oligo-deoxynucleotides to probe substrate susceptibility.
  • In vitro cleavage assays with linear and circular substrates of varying 5' terminal modifications.

Main Results:

  • Circular mRNA substrates are more resistant to RNase E cleavage than linear ones.
  • Antisense oligonucleotides targeting the 5' end reduce RNase E activity.
  • RNase E shows a strong preference for 5' monophosphorylated substrates over 5'-triphosphate forms.

Conclusions:

  • RNase E possesses inherent vectorial properties dependent on the 5' end of its substrates.
  • This 5'-end dependence explains the directional mRNA decay and 'all or none' decay phenomena.
  • The findings shed light on mRNA stability mechanisms, including the role of 5' stem-loop structures.

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