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Regulation of RNase E during the UV stress response in the cyanobacterium Synechocystis *** 6803

mLife 2023年第1期2卷 43-57页

作者： Satoru Watanabe damir stazic Jens Georg Shota Ohtake Yutaka Sakamaki Megumi Numakura Munehiko Asayama Taku Chibazakura Annegret Wilde Claudia Steglich Wolfgang R.Hess Faculty of Biology Genetics and Experimental BioinformaticsUniversity of FreiburgFreiburgGermany Department of Bioscience Tokyo University of AgricultureSetagayakuTokyoJapan School of Agriculture Molecular GeneticsIbaraki UniversityIbarakiJapan Faculty of Biology Molecular GeneticsUniversity of FreiburgFreiburgGermany Nexxiot Prime Tower(Hardstrasse 201)ZurichSwitzerland.

Endoribonucleases govern the maturation and degradation of RNA and are indispensable in the posttranscriptional regulation of gene expression.A key endoribonuclease in Gram-negative bacteria is RNase *** ensure an appropriate supply of RNase E,some bacteria,such as Escherichia coli,feedback-regulate RNase E expression via the rne 5′-untranslated region(5′UTR)in ***,the mechanisms involved in the control of RNase E in other bacteria largely remain *** rely on solar light as an energy source for photosynthesis,despite the inherent ultraviolet(UV)*** this study,we first investigated globally the changes in gene expression in the cyanobacterium Synechocystis *** ^(6)803 after a brief exposure to *** the 407 responding genes 2 h after UV exposure was a prominent upregulation of rne mRNA ***,the enzymatic activity of RNase E rapidly increased as well,although the protein stability *** unique response was underpinned by the increased accumulation of full-length rne mRNA caused by the stabilization of its 5′UTR and suppression of premature transcriptional termination,but not by an increased transcription *** of RNA 3′ends and in vitro cleavage assays revealed that RNase E cleaves within a stretch of six consecutive uridine residues within the rne 5′UTR,indicating *** observations suggest that RNase E in cyanobacteria contributes to reshaping the transcriptome during the UV stress response and that its required activity level is secured at the RNA level despite the enhanced turnover of the protein.

关键词： cyanobacteria protein turnover ribonuclease stress response

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