Coupling of Cdc20 inhibition and activation by BubR1.

Coupling of Cdc20 inhibition and activation by BubR1.
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DOI:
10.1083/jcb.202012081
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发表时间:
2021-05-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Nilsson J
Nilsson J
中科院分区:
其他
文献类型:
--
作者:
Hein JB;Garvanska DH;Nasa I;Kettenbach AN;Nilsson J

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Cdc 20活性的严格控制是适当的细胞分裂所必需的。在这里,它表明,BubR 1检查点蛋白整合Cdc 20抑制和激活。PP 2A-B56结合BubR 1去除Cdc 20抑制磷酸化,允许有效的有丝分裂退出。APC/C-Cdc 20泛素连接酶靶向细胞周期蛋白B1降解的紧密调节是重要的有丝分裂保真度。纺锤体组装检查点(SAC)通过有丝分裂检查点复合物(MCC)抑制Cdc 20。此外,cyclin B1-Cdk 1对Cdc 20的磷酸化独立地抑制APC/C-Cdc 20活化。这就为Cdc 20在细胞周期蛋白B1降解之前如何被激活创造了一个难题。在这里,我们表明,MCC组件BubR 1窝藏Cdc 20抑制和激活活动,允许两个Cdc 20抑制途径之间的串扰。具体而言,BubR 1作为PP 2A-B56的底物指定剂,使MCC中的Cdc 20有效去磷酸化。突变Cdc 20模仿去磷酸化状态逃脱有丝分裂检查点逮捕,认为限制Cdc 20去磷酸化的MCC是重要的。总的来说,我们的工作揭示了如何Cdc 20可以在细胞周期蛋白B1-Cdk 1活性的存在下去磷酸化,而不引起过早的后期发作。
Tight control of Cdc20 activity is required for proper cell division. Here, it is shown that the BubR1 checkpoint protein integrates both Cdc20 inhibition and activation. PP2A-B56 bound to BubR1 removes Cdc20 inhibitory phosphorylation, allowing for efficient mitotic exit. Tight regulation of the APC/C-Cdc20 ubiquitin ligase that targets cyclin B1 for degradation is important for mitotic fidelity. The spindle assembly checkpoint (SAC) inhibits Cdc20 through the mitotic checkpoint complex (MCC). In addition, phosphorylation of Cdc20 by cyclin B1–Cdk1 independently inhibits APC/C–Cdc20 activation. This creates a conundrum for how Cdc20 is activated before cyclin B1 degradation. Here, we show that the MCC component BubR1 harbors both Cdc20 inhibition and activation activities, allowing for cross-talk between the two Cdc20 inhibition pathways. Specifically, BubR1 acts as a substrate specifier for PP2A-B56 to enable efficient Cdc20 dephosphorylation in the MCC. A mutant Cdc20 mimicking the dephosphorylated state escapes a mitotic checkpoint arrest, arguing that restricting Cdc20 dephosphorylation to the MCC is important. Collectively, our work reveals how Cdc20 can be dephosphorylated in the presence of cyclin B1-Cdk1 activity without causing premature anaphase onset.
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