Actin homolog MreB affects chromosome segregation by regulating topoisomerase IV in Escherichia coli.

Actin homolog MreB affects chromosome segregation by regulating topoisomerase IV in Escherichia coli.
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DOI:
10.1016/j.molcel.2009.01.001
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发表时间:
2009-01-30
期刊:
影响因子:
16
通讯作者:
Marians, Kenneth J.
Marians, Kenneth J.
中科院分区:
生物学1区
文献类型:
--
作者:
Madabhushi, Ram;Marians, Kenneth J.

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在大肠杆菌中,拓扑异构酶 IV(一种 II 型拓扑异构酶)介导复制子染色体之间拓扑连接的解析,对于染色体分离至关重要。 Topo IV 活性仅限于细胞周期后期的一小段时间。然而,赋予这种时间调节的机制尚不清楚。在这里,我们报道细菌肌动蛋白同源物 MreB 参与 Topo IV 活性的时间振荡。我们发现 mreB 突变株缺乏 Topo IV 活性。此外,我们证明,根据其处于单体状态还是聚合状态,MreB 对 Topo IV 活性的影响不同。此外,MreB 与 Topo IV 的 ParC 亚基发生物理相互作用。这些结果可以解释细菌细胞骨架的动力学如何与染色体分离的时间相协调。
In Escherichia coli, topoisomerase IV, a type II topoisomerase, mediates the resolution of topological linkages between replicated daughter chromosomes and is essential for chromosome segregation. Topo IV activity is restricted to only a short interval late in the cell cycle. However, the mechanism that confers this temporal regulation is unknown. Here we report that the bacterial actin homologue, MreB, participates in the temporal oscillation of Topo IV activity. We show that mreB mutant strains are deficient in Topo IV activity. In addition, we demonstrate that depending upon whether it is in a monomeric or polymerized state, MreB affects Topo IV activity differentially. In addition, MreB physically interacts with the ParC subunit of Topo IV. Together these results may explain how dynamics of the bacterial cytoskeleton are coordinated with the timing of chromosome segregation.
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