DnaA couples DNA replication and the expression of two cell cycle master regulators.

Détails

ID Serval
serval:BIB_BF046CD08E9D
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
DnaA couples DNA replication and the expression of two cell cycle master regulators.
Périodique
EMBO Journal
Auteur(s)
Collier J., Murray S.R., Shapiro L.
ISSN
0261-4189
Statut éditorial
Publié
Date de publication
2006
Peer-reviewed
Oui
Volume
25
Numéro
2
Pages
346-356
Langue
anglais
Résumé
Cell cycle progression in Caulobacter is driven by the master transcriptional regulators CtrA and GcrA. The cellular levels of CtrA and GcrA are temporally and spatially out-of-phase during the cell cycle, with CtrA repressing gcrA transcription and GcrA activating ctrA transcription. Here, we show that DnaA, a protein required for the initiation of DNA replication, also functions as a transcriptional activator of gcrA, which in turn activates multiple genes, notably those involved in chromosome replication and segregation. The cellular concentration of DnaA is cell cycle-controlled, peaking at the time of replication initiation and gcrA induction. Regulated proteolysis of GcrA contributes to the cell cycle variations in GcrA abundance. We propose that DnaA couples DNA replication initiation with the expression of the two oscillating regulators GcrA and CtrA and that the DnaA/GcrA/CtrA regulatory cascade drives the forward progression of the Caulobacter cell cycle.
Mots-clé
Bacterial Proteins, Base Sequence, Caulobacter crescentus, Cell Cycle, DNA Replication, DNA-Binding Proteins, Gene Expression Regulation, Bacterial, Half-Life, Immunoblotting, Models, Biological, Molecular Sequence Data, Mutagenesis, Site-Directed, Promoter Regions, Genetic, Transcription Factors, Transcriptional Activation
Pubmed
Web of science
Open Access
Oui
Création de la notice
27/02/2009 16:44
Dernière modification de la notice
20/08/2019 16:33
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