Modularity of the bacterial cell cycle enables independent spatial and temporal control of DNA replication.
Modularity of the bacterial cell cycle enables independent spatial and temporal control of DNA replication.
复制标题
DOI:
10.1016/j.cub.2011.05.040
复制
发表时间:
2011-07-12
期刊:
影响因子:
9.2
通讯作者:
Laub, Michael T.
中科院分区:
文献类型:
--
作者:
Jonas, Kristina;Chen, Y. Erin;Laub, Michael T.
Complex regulatory circuits in biology are often built of simpler sub-circuits, or modules. In most cases, the functional consequences and evolutionary origins of modularity remain poorly defined. Here, by combining single-cell microscopy with genetic approaches, we demonstrate that two separable modules independently govern the temporal and spatial control of DNA replication in the asymmetrically dividing bacterium Caulobacter crescentus. DNA replication control involves DnaA, which promotes initiation, and CtrA, which silences initiation. We show that oscillations in DnaA activity dictate the periodicity of replication while CtrA governs the asymmetric replicative fates of daughter cells. Importantly, we demonstrate that DnaA activity oscillates independently of CtrA. The genetic separability of spatial and temporal control modules in Caulobacter reflects their evolutionary history. DnaA is the central component of an ancient and phylogenetically widespread circuit that governs replication periodicity in Caulobacter and most other bacteria. By contrast, CtrA, which is found only in the asymmetrically dividing α-proteobacteria, was integrated later in evolution to enforce replicative asymmetry on daughter cells.
登录
查看更多内容
影响因子:
64.5
作者:
Domian, IJ;Quon, KC;Shapiro, L
通讯作者:
Shapiro, L
DOI:
10.1073/pnas.0604554103
发表时间:
2006-07-18
影响因子:
11.1
作者:
Iniesta, Antonio A.;McGrath, Patrick T.;Shapiro, Lucy
通讯作者:
Shapiro, Lucy
DOI:
10.1073/pnas.96.19.10661
发表时间:
1999-09-14
影响因子:
11.1
作者:
Jensen, RB;Shapiro, L
通讯作者:
Shapiro, L
影响因子:
64.8
作者:
Hartwell, LH;Hopfield, JJ;Murray, AW
通讯作者:
Murray, AW
影响因子:
--
作者:
Brilli, Matteo;Fondi, Marco;Biondi, Emanuele G.
通讯作者:
Biondi, Emanuele G.