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Nucleic Acids Res. 2017 May 5;45(8):4708-4721. doi: 10.1093/nar/gkw1018.

The RNA ligase RtcB reverses MazF-induced ribosome heterogeneity in Escherichia coli.

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Max F. Perutz Laboratories, Center for Molecular Biology, Department of Microbiology, Immunobiology and Genetics, University of Vienna, Vienna Biocenter (VBC), Dr Bohr-Gasse 9/4, A-1030 Vienna, Austria.
Institute of Molecular Biotechnology of the Austrian Academy of Sciences (IMBA), Vienna Biocenter (VBC), A-1030 Vienna, Austria and Max F. Perutz Laboratories, Department of Medical Biochemistry, Medical University of Vienna, Vienna Biocenter (VBC), Dr Bohr-Gasse 9/4, A-1030 Vienna, Austria.


When Escherichia coli encounters stress, the endoribonuclease MazF initiates a post-transcriptional response that results in the reprogramming of protein synthesis. By removing the 3΄-terminus of the 16S rRNA, MazF generates specialized ribosomes that selectively translate mRNAs likewise processed by MazF. Given the energy required for de novo ribosome biosynthesis, we considered the existence of a repair mechanism operating upon stress relief to recycle the modified ribosomes. Here, we show that the stress-ribosomes and the 3΄-terminal 16S rRNA fragment are stable during adverse conditions. Moreover, employing in vitro and in vivo approaches we demonstrate that the RNA ligase RtcB catalyzes the re-ligation of the truncated 16S rRNA present in specialized ribosomes Thereby their ability to translate canonical mRNAs is fully restored. Together, our findings not only provide a physiological function for the RNA ligase RtcB in bacteria but highlight the reversibility of ribosome heterogeneity, a crucial but hitherto undescribed concept for translational regulation.

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