A role for topoisomerase III in Escherichia coli chromosome segregation.

A role for topoisomerase III in Escherichia coli chromosome segregation.
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DOI:
10.1111/mmi.12039
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发表时间:
2012-11
影响因子:
3.6
通讯作者:
Marians KJ
Marians KJ
中科院分区:
生物学2区
文献类型:
--
作者:
Perez-Cheeks BA;Lee C;Hayama R;Marians KJ

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大肠杆菌拓扑异构酶III的细胞功能仍然难以捉摸。我们发现,救援的温度敏感的突变体帕雷和parC(编码的染色体decatenase拓扑异构酶IV的亚基)在限制性温度下的高拷贝抑制剂是严格依赖于topB(编码拓扑异构酶III)。帕雷ΔtopB和parCΔtopB的双突变体几乎不能存活,生长缓慢,在允许的温度下染色体分离缺陷。topB突变体表型不是由毒性重组中间体的积累引起的,因为它不被recQ或recA中的突变所缓解。此外,在其他野生型遗传背景下,用II型拓扑异构酶抑制剂新生霉素处理的ΔtopB细胞显示异常染色体分离。新生霉素的敏感性是由于对拓扑异构酶IV的需求增加,不太可能定义拓扑异构酶III的新作用;因此,这些结果表明拓扑异构酶III参与了大肠杆菌中有序和有效的染色体分离。杆菌
The cellular function of Escherichia coli topoisomerase III remains elusive. We show that rescue of temperature-sensitive mutants in parE and parC (encoding the subunits of the chromosomal decatenase topoisomerase IV) at restrictive temperatures by high-copy suppressors is strictly dependent on topB (encoding topoisomerase III). Double mutants of parEΔtopB and parCΔtopB were barely viable, grew slowly, and were defective in chromosome segregation at permissive temperatures. The topB mutant phenotype did not result from accumulation of toxic recombination intermediates, because it was not relieved by mutations in either recQ or recA. In addition, in an otherwise wild-type genetic background, ΔtopB cells treated with the type II topoisomerase inhibitor novobiocin displayed aberrant chromosome segregation. This novobiocin sensitivity was attributable to an increased demand for topoisomerase IV and is unlikely to define a new role for topoiosmerase III; therefore, these results suggest that topoisomerase III participates in orderly and efficient chromosome segregation in E. coli.
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