AAU-specific RNA cleavage mediated by MazF toxin endoribonuclease conserved in Nitrosomonas Europaea

Tatsuki Miyamoto, Akiko Yokota, Satoshi Tsuneda*, Naohiro Noda

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Nitrosomonas europaea carries numerous toxin-antitoxin systems. However, despite the abundant representation in its chromosome, studies have not surveyed the underlying molecular functions in detail, and their biological roles remain enigmatic. In the present study, we found that a chromosomally-encoded MazF family member, predicted at the locus NE1181, is a functional toxin endoribonuclease, and constitutes a toxin-antitoxin system, together with its cognate antitoxin, MazE. Massive parallel sequencing provided strong evidence that this toxin endoribonuclease exhibits RNA cleavage activity, primarily against the AAU triplet. This sequence-specificity was supported by the results of fluorometric assays. Our results indicate that N. europaea alters the translation profile and regulates its growth using the MazF family of endoribonuclease under certain stressful conditions.

Original languageEnglish
Article number174
Issue number6
Publication statusPublished - 2016 Jun


  • MazF
  • Nitrosomonas europaea
  • Sequence-specific endoribonuclease
  • Toxin-antitoxin system

ASJC Scopus subject areas

  • Toxicology
  • Health, Toxicology and Mutagenesis


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