Cells protect chromosome-microtubule attachments, independent of biorientation, using an Astrin-PP1 and CyclinB-CDK1 feedback loop

Cells protect chromosome-microtubule attachments, independent of biorientation, using an Astrin-PP1 and CyclinB-CDK1 feedback loop
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细胞使用 Astrin-PP1 和 CyclinB-CDK1 反馈环路保护染色体微管附着,与生物方向无关

DOI:
10.1101/2020.12.24.424312
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发表时间:
2020
期刊:
--
影响因子:
--
通讯作者:
Conti D
Conti D
中科院分区:
--
文献类型:
--
作者:
Conti D

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染色体-微管连接缺陷可导致染色体不稳定,与不育和侵袭性癌症有关。染色体-微管的附着是由一个大的大分子结构,动粒介导的。动粒对是双向取向的,并由微管从相对的纺锤体极拉动,以确保染色体的平等分离。缺乏反向拉力的Kinetochore-microtubule附件被Aurora-B/Ipl 1分离;然而,作为双定向的先决条件,但缺乏反向拉力的单定向附件如何幸免尚不清楚。使用RNAi介导的筛选,我们发现了Astrin-SKAP复合物在保护单取向附件中的独特作用。我们提供了第一个证据,微管末端相关蛋白如何感知外动粒变化特定于端对附件和组装成一个外动粒新月稳定成熟附件。我们发现,Astrin-PP 1和细胞周期蛋白-B-CDK 1的活动相互抵消,以保持单向连接。因此,细胞不仅测量染色体微管附着错误,而且它们还主动感知和稳定不依赖于双向取向的成熟附着。
Defects in chromosome-microtubule attachment can cause chromosomal instability, associated with infertility and aggressive cancers. Chromosome-microtubule attachment is mediated by a large macromolecular structure, the kinetochore. Kinetochore pairs are bioriented and pulled by microtubules from opposing spindle poles to ensure the equal segregation of chromosomes. Kinetochore-microtubule attachments lacking opposing-pull are detached by Aurora-B/Ipl1; yet, how mono-oriented attachments that are a prerequisite for biorientation, but lacking opposing-pull are spared is unclear. Using an RNAi-mediated screen, we uncover a unique role for the Astrin-SKAP complex in protecting mono-oriented attachments. We provide the first evidence for how a microtubule-end associated protein senses outer-kinetochore changes specific to end-on attachments and assembles into an outer kinetochore crescent to stabilise mature attachments. We find that Astrin-PP1 and Cyclin-B-CDK1 activities counteract each other to preserve mono-oriented attachments. Thus, cells are not only surveying chromosome-microtubule attachment errors, but they are also actively sensing and stabilising mature attachments independent of biorientation.
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