Size sensors in bacteria, cell cycle control, and size control.

Size sensors in bacteria, cell cycle control, and size control.
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DOI:
10.3389/fmicb.2015.00515
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发表时间:
2015
影响因子:
5.2
通讯作者:
Robert L
Robert L
中科院分区:
生物学2区
文献类型:
--
作者:
Robert L

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细菌通过细胞生长和分裂的重复周期进行增殖。进入细胞周期的过程被认为是由细胞大小控制的。然而,这一调控的分子基础仍不清楚。在这里,我将讨论哪些机制可以通过感知大小并将此信息传输到划分机制来实现增长和划分的耦合。大小传感器可以在细胞周期的不同阶段发挥作用。在隔膜形成过程中,控制Z环形成的机制,如MinCD抑制或核样闭塞(NO),可能参与了分裂过程的大小依赖。此外,生长和分裂的耦合可能通过控制DNA复制起始而间接发生。这些不同的大小感知机制的相对重要性可能取决于环境和遗传背景。最近在细菌中证明了一种增量大小控制策略,这表明依赖于DNAA的复制启动控制可能是限制细胞大小变化的主要大小控制机制。
Bacteria proliferate by repetitive cycles of cellular growth and division. The progression into the cell cycle is admitted to be under the control of cell size. However, the molecular basis of this regulation is still unclear. Here I will discuss which mechanisms could allow coupling growth and division by sensing size and transmitting this information to the division machinery. Size sensors could act at different stages of the cell cycle. During septum formation, mechanisms controlling the formation of the Z ring, such as MinCD inhibition or Nucleoid Occlusion (NO) could participate in the size-dependence of the division process. In addition or alternatively, the coupling of growth and division may occur indirectly through the control of DNA replication initiation. The relative importance of these different size-sensing mechanisms could depend on the environmental and genetic context. The recent demonstration of an incremental strategy of size control in bacteria, suggests that DnaA-dependent control of replication initiation could be the major size control mechanism limiting cell size variation.
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