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Insights into the mRNA cleavage mechanism by MazF, an mRNA interferase

Yonglong Zhang1, Junjie Zhang, Hiroto Hara

  • 1Department of Biochemistry, Robert Wood Johnson Medical School, Piscataway, New Jersey 08854 and Takara Bio Inc., Seta 3-4-1, Otsu, Shiga, 520-2193, Japan.

The Journal of Biological Chemistry
|November 13, 2004
PubMed

Insights

MazF, an Escherichia coli toxin, is an endoribonuclease that cleaves messenger RNAs specifically at ACA sequences. This finding clarifies its role in regulating cell growth and protein synthesis.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Microbiology

Background:

  • MazF is a conserved prokaryotic toxin from Escherichia coli.
  • It plays a role in regulating cell growth by inhibiting protein synthesis.
  • The precise mechanism of MazF's action has been debated.

Purpose of the Study:

  • To unequivocally demonstrate the enzymatic mechanism of MazF.
  • To identify the specific cleavage site and requirements for MazF activity.

Main Methods:

  • Enzymatic assays using short RNA substrates.
  • Utilizing DNA-RNA chimeric substrates to identify essential residues for cleavage.

Main Results:

  • MazF was confirmed as an endoribonuclease.
  • It specifically cleaves messenger RNAs (mRNAs) at ACA sequences.
  • Cleavage occurs at the 5'-end of ACA, producing a 2',3'-cyclic phosphate and a 5'-OH group.
  • The 2'-OH group of the residue preceding the ACA sequence is essential for cleavage.

Conclusions:

  • MazF exhibits exquisite site specificity for ACA sequences.
  • MazF functions as an RNA-restriction enzyme.
  • It can be utilized as an mRNA interferase to control cell growth in prokaryotes and eukaryotes.

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