Constitutive stringent response restores viability of <em>Bacillus subtilis</em> lacking structural maintenance of chromosome protein - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue PLoS ONE Année : 2015

Constitutive stringent response restores viability of Bacillus subtilis lacking structural maintenance of chromosome protein

Résumé

Bacillus subtilis mutants lacking the SMC-ScpAB complex are severely impaired for chromosome condensation and partitioning, DNA repair, and cells are not viable under standard laboratory conditions. We isolated suppressor mutations that restored the capacity of a smc deletion mutant (Δsmc) to grow under standard conditions. These suppressor mutations reduced chromosome segregation defects and abrogated hypersensitivity to gyrase inhibitors of Δsmc. Three suppressor mutations were mapped in genes involved in tRNA aminoacylation and maturation pathways. A transcriptomic survey of isolated suppressor mutations pointed to a potential link between suppression of Δsmc and induction of the stringent response. This link was confirmed by (p)ppGpp quantification which indicated a constitutive induction of the stringent response in multiple suppressor strains. Furthermore, sublethal concentrations of arginine hydroxamate (RHX), a potent inducer of stringent response, restored growth of Δsmc under non permissive conditions. We showed that production of (p)ppGpp alone was sufficient to suppress the thermosensitivity exhibited by the Δsmc mutant. Our findings shed new light on the coordination between chromosome dynamics mediated by SMC-ScpAB and other cellular processes during rapid bacterial growth.
Fichier principal
Vignette du fichier
2015_Benoist_Plos One_1.pdf (5.02 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02630923 , version 1 (27-05-2020)

Licence

Paternité

Identifiants

Citer

Camille Benoist, Cyprien Guerin Guérin, Philippe P. Noirot, Etienne Dervyn. Constitutive stringent response restores viability of Bacillus subtilis lacking structural maintenance of chromosome protein. PLoS ONE, 2015, 10 (11), ⟨10.1371/journal.pone.0142308⟩. ⟨hal-02630923⟩
18 Consultations
23 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More