BubR1 N terminus acts as a soluble inhibitor of cyclin B degradation by APC/C(Cdc20) in interphase.

BubR1 N terminus acts as a soluble inhibitor of cyclin B degradation by APC/C(Cdc20) in interphase.
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DOI:
10.1016/j.devcel.2008.11.004
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发表时间:
2009-01
期刊:
影响因子:
11.8
通讯作者:
van Deursen, Jan M.
van Deursen, Jan M.
中科院分区:
生物学1区
文献类型:
--
作者:
Malureanu, Liviu A.;Jeganathan, Karthik B.;Hamada, Masakazu;Wasilewski, Lisa;Davenport, James;van Deursen, Jan M.

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BubR1是一种重要的有丝分裂检查点蛋白,具有多个功能域。它涉及有丝分裂检查点控制-作为未附着着丝点的活性激酶和APC/CCdc20活性的细胞质抑制剂-以及有丝分裂定时和稳定的染色体-纺锤体附着。使用BubR1条件敲除细胞和BubR1结构域突变体,我们证明BubR1的n端Cdc20结合结构域对所有这些功能都是必不可少的,而其c端Cdc20结合结构域、bub3结合结构域和激酶结构域则不是。我们发现bubr1n端以KEN box依赖的方式与Cdc20结合,抑制间期APC/C活性,从而允许细胞周期蛋白B在有丝分裂开始前的G2期积累。总之,我们的研究结果表明,着丝点结合的BubR1不是必需的,可溶性BubR1在间期作为APC/CCdc20的假底物抑制剂,以防止特定APC/C底物的非预定降解。
BubR1 is an essential mitotic checkpoint protein with multiple functional domains. It has been implicated in mitotic checkpoint control -as an active kinase at unattached kinetochores and as a cytosolic inhibitor of APC/CCdc20 activity- as well as in mitotic timing and stable chromosome-spindle attachment. Using BubR1-conditional knockout cells and BubR1 domain mutants, we demonstrate that the N-terminal Cdc20 binding domain of BubR1 is essential for all of these functions, whereas its C-terminal Cdc20-binding domain, Bub3-binding domain, and kinase domain are not. We find that the BubR1 N terminus binds to Cdc20 in a KEN box-dependent manner to inhibit APC/C activity in interphase, thereby allowing accumulation of cyclin B in G2 phase prior to mitosis onset. Together, our results suggest that kinetochore-bound BubR1 is non-essential and that soluble BubR1 functions as a pseudosubstrate inhibitor of APC/CCdc20 during interphase to prevent unscheduled degradation of specific APC/C substrates.
DOI: 10.1083/jcb.200706015
发表时间: 2007-10-22
期刊: The Journal of cell biology
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作者:
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