Anillin-dependent organization of septin filaments promotes intercellular bridge elongation and Chmp4B targeting to the abscission site.

Anillin-dependent organization of septin filaments promotes intercellular bridge elongation and Chmp4B targeting to the abscission site.
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DOI:
10.1098/rsob.130190
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发表时间:
2014-01-22
期刊:
影响因子:
5.8
通讯作者:
Wilde A
Wilde A
中科院分区:
生物学2区
文献类型:
--
作者:
Renshaw MJ;Liu J;Lavoie BD;Wilde A

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细胞质分裂的最后一步是分离,连接两个新子细胞的细胞间桥(ICB)断裂。正确构建ICB对于分离相关因素的组装至关重要,分离失败会导致非整倍体。利用实时成像和亚衍射显微镜,我们确定了ICB形成和成熟过程中新的抗青霉素-败血症蛋白细胞骨架依赖阶段。我们发现,在初始ICB形成后,隔素丝驱动ICB伸长,在此期间,含有抗青霉素-隔素环的小管从ICB中挤出。然后在成熟的ICB内产生进一步收缩的位点,随后将其移除。在ICB成熟过程中,抗菌素- septin复合物的作用也为ICB在脱落位点的ESCRT III组分Chmp4B的未来组装做好了准备。这些研究表明,不同的收缩机制的顺序作用协调了脱落位点的形成和细胞分裂的成功完成。
The final step of cytokinesis is abscission when the intercellular bridge (ICB) linking the two new daughter cells is broken. Correct construction of the ICB is crucial for the assembly of factors involved in abscission, a failure in which results in aneuploidy. Using live imaging and subdiffraction microscopy, we identify new anillin–septin cytoskeleton-dependent stages in ICB formation and maturation. We show that after the formation of an initial ICB, septin filaments drive ICB elongation during which tubules containing anillin–septin rings are extruded from the ICB. Septins then generate sites of further constriction within the mature ICB from which they are subsequently removed. The action of the anillin–septin complex during ICB maturation also primes the ICB for the future assembly of the ESCRT III component Chmp4B at the abscission site. These studies suggest that the sequential action of distinct contractile machineries coordinates the formation of the abscission site and the successful completion of cytokinesis.
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