Activation of a signaling pathway by the physical translocation of a chromosome.

Activation of a signaling pathway by the physical translocation of a chromosome.
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通过染色体的物理易位激活信号通路。

DOI:
10.1016/j.devcel.2021.06.014
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发表时间:
2021-08-09
期刊:
影响因子:
11.8
通讯作者:
Laub MT
Laub MT
中科院分区:
生物学1区
文献类型:
--
作者:
Guzzo M;Sanderlin AG;Castro LK;Laub MT

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在每个生物体中,细胞周期都需要按照严格定义的顺序执行多个过程。然而,人们对确保这种顺序的机制仍然知之甚少,尤其是在细菌中。在这里,我们表明,在新月柄杆菌中触发细胞分裂的重要 CtrA 信号通路的激活本质上与通过新复制的染色体的物理易位启动 DNA 复制有关,由 ParABS 系统提供动力。我们证明,在染色体分离过程中,ParA 在新细胞极处的积累会招募 ChpT(CtrA 信号通路的中间组件)。在新染色体和 ParA 到达之前,ChpT 通常无法访问选择性 PopZ 极性微结构域。因此,DNA 复制起始的任何破坏都会阻止 ChpT 极化,进而阻止细胞分裂。总的来说,我们的研究结果揭示了柄杆菌中主要细胞周期事件是如何协调的,更重要的是,染色体易位如何触发重要的信号通路。古佐等人。揭示了新月柄杆菌中细胞分裂与 DNA 复制耦合的机制。他们发现,新复制的染色体的主动易位通过将该途径的中间成分招募到细胞极来激活重要的信号转导途径。
In every organism, the cell cycle requires the execution of multiple processes in a strictly defined order. However, the mechanisms used to ensure such order remain poorly understood, particularly in bacteria. Here, we show that the activation of the essential CtrA signaling pathway that triggers cell division in Caulobacter crescentus is intrinsically coupled to the initiation of DNA replication via the physical translocation of a newly-replicated chromosome, powered by the ParABS system. We demonstrate that ParA accumulation at the new cell pole during chromosome segregation recruits ChpT, an intermediate component of the CtrA signaling pathway. ChpT is normally restricted from accessing the selective PopZ polar microdomain until the new chromosome and ParA arrive. Consequently, any disruption to DNA replication initiation prevents ChpT polarization and, in turn, cell division. Collectively, our findings reveal how major cell-cycle events are coordinated in Caulobacter and, importantly, how chromosome translocation triggers an essential signaling pathway. Guzzo et al. reveal a mechanism for coupling cell division to DNA replication in Caulobacter crescentus. They find that active translocation of a newly replicated chromosome activates an essential signal transduction pathway by recruiting the intermediate component of that pathway to the cell pole.
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