Spx, the central regulator of the heat and oxidative stress response in B. subtilis, can repress transcription of translation-related genes

verfasst von
Heinrich Schäfer, Anja Heinz, Petra Sudzinová, Michelle Voß, Ingo Hantke, Libor Krásný, Kürşad Turgay
Abstract

Spx is a Bacillus subtilis transcription factor that interacts with the alpha subunits of RNA polymerase. It can activate the thiol stress response regulon and interfere with the activation of many developmental processes. Here, we show that Spx is a central player orchestrating the heat shock response by up-regulating relevant stress response genes as revealed by comparative transcriptomic experiments. Moreover, these experiments revealed the potential of Spx to inhibit transcription of translation-related genes. By in vivo and in vitro experiments, we confirmed that Spx can inhibit transcription from rRNA. This inhibition depended mostly on UP elements and the alpha subunits of RNA polymerase. However, the concurrent up-regulation activity of stress genes by Spx, but not the inhibition of translation related genes, was essential for mediating stress response and antibiotic tolerance under the applied stress conditions. The observed inhibitory activity might be compensated in vivo by additional stress response processes interfering with translation. Nevertheless, the impact of Spx on limiting translation becomes apparent under conditions with high cellular Spx levels. Interestingly, we observed a subpopulation of stationary phase cells that contains raised Spx levels, which may contribute to growth inhibition and a persister-like behaviour of this subpopulation during outgrowth.

Organisationseinheit(en)
Institut für Mikrobiologie
Externe Organisation(en)
Freie Universität Berlin (FU Berlin)
Akademie Věd České Republiky (AV ČR)
Typ
Artikel
Journal
Molecular microbiology
Band
111
Seiten
514-533
Anzahl der Seiten
20
ISSN
0950-382X
Publikationsdatum
11.12.2018
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Mikrobiologie, Molekularbiologie
Elektronische Version(en)
https://doi.org/10.1111/mmi.14171 (Zugang: Geschlossen)