The APC/C maintains the spindle assembly checkpoint by targeting Cdc20 for destruction.

The APC/C maintains the spindle assembly checkpoint by targeting Cdc20 for destruction.
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DOI:
10.1038/ncb1799
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发表时间:
2008-12
影响因子:
21.3
通讯作者:
Pines, Jonathon
Pines, Jonathon
中科院分区:
生物学1区
文献类型:
--
作者:
Nilsson, Jakob;Yekezare, Mona;Minshull, Jeremy;Pines, Jonathon

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需要纺锤体组装检查点(SAC)来阻止姐妹染色单体分离,直到所有染色体都正确地附着在有丝分裂装置上。SAC通过后期促进复合体/环体(APC/C)泛素连接酶抑制细胞周期蛋白B1和securin的泛素化,从而阻止细胞进入后期。SAC的靶标是重要的APC/C活化剂Cdc20。目前尚不清楚SAC如何使Cdc20失活,但目前的模型主要涉及Cdc20与Mad2检查点蛋白形成稳定的复合物。这里我们发现大多数Cdc20不在Mad2的复合体中;相反,Cdc20需要Mad2才能与另一种检查点蛋白BubR1形成复合物。我们进一步表明,在SAC过程中,APC/C泛素化Cdc20以靶向其降解。因此,人类Cdc20的泛素化并不需要将其从检查点复合体中释放出来,而是需要将其降解以维持有丝分裂阻滞。
The Spindle Assembly Checkpoint (SAC) is required to block sister chromatid separation until all chromosomes are properly attached to the mitotic apparatus. The SAC prevents cells entering anaphase by inhibiting the ubiquitination of cyclin B1 and securin by the Anaphase Promoting Complex/Cyclosome (APC/C) ubiquitin ligase. The target of the SAC is the essential APC/C activator, Cdc20. It is unclear how the SAC inactivates Cdc20 but current models mostly involve Cdc20 forming a stable complex with the Mad2 checkpoint protein. Here we show that most Cdc20 is not in a complex with Mad2; instead Mad2 is required for Cdc20 to form a complex with another checkpoint protein, BubR1. We further show that during the SAC the APC/C ubiquitinates Cdc20 to target it for degradation. Thus, ubiquitination of human Cdc20 is not required to release it from the checkpoint complex, but to degrade it to maintain mitotic arrest.
Cdc20在哺乳动物细胞中的动力学和中心体的CDC20的快速微管动力学。
DOI: 10.1083/jcb.200201135
发表时间: 2002-09-02
影响因子: 7.8
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Kallio, Marko J;Beardmore, Victoria A;Weinstein, Jasminder;Gorbsky, Gary J
通讯作者: Gorbsky, Gary J
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发表时间: 2002-04-01
影响因子: 5.3
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发表时间: 2004-09-01
影响因子: 21.3
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发表时间: 2001-04-02
期刊: The Journal of cell biology
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发表时间: 2001-09-17
期刊: EMBO JOURNAL
影响因子: 11.4
作者:
Schwab, M;Neutzner, M;Seufert, W
通讯作者: Seufert, W