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MazF activation causes ACA sequence-independent and selective alterations in RNA levels in Escherichia coli

Abstract

Escherichia coli MazF is a toxin protein that cleaves RNA at ACA sequences. Its activation has been thought to cause growth inhibition, primarily through indiscriminate cleavage of RNA. To investigate responses following MazF activation, transcriptomic profiles of mazF-overexpressing and non-overexpressing E. coli K12 cells were compared. Analyses of differentially expressed genes demonstrated that the presence and the number of ACA trimers in RNA was unrelated to cellular RNA levels. Mapping differentially expressed genes onto the chromosome identified two chromosomal segments in which upregulated genes formed clusters, and these segments were absent in the chromosomes of E. coli strains other than K12. These results suggest that MazF regulates selective, rather than indiscriminate, categories of genes, and is involved in the regulation of horizontally acquired genes. We conclude that the primary role of MazF is not only cleaving RNA indiscriminately but also generating a specific cellular state.

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Acknowledgements

We would like to thank to the rest of iGEM team Tokyo_Tech 2016 team members for collaboration on the early stages of this work. We are grateful to Ms. Tomoko Narisawa and Ms. Masako Sato for technical assistance. This work was supported by the Japan Society for the Promotion of Science (Grant number 17K07714).

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Correspondence to Nobutaka Nakashima.

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Communicated by Erko Stackebrandt.

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Akiyama, K., Fujisawa, K., Kondo, H. et al. MazF activation causes ACA sequence-independent and selective alterations in RNA levels in Escherichia coli. Arch Microbiol 202, 105–114 (2020). https://doi.org/10.1007/s00203-019-01726-9

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  • DOI: https://doi.org/10.1007/s00203-019-01726-9

Keywords

  • Horizontal gene transfer
  • MazF
  • Metatranscriptome
  • RNA-interferase
  • RNA-seq
  • Toxin-antitoxin