Bub1 regulates chromosome segregation in a kinetochore-independent manner.

Bub1 regulates chromosome segregation in a kinetochore-independent manner.
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DOI:
10.1083/jcb.200902128
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发表时间:
2009-06-01
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Meraldi P
Meraldi P
中科院分区:
其他
文献类型:
--
作者:
Klebig C;Korinth D;Meraldi P

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着丝粒结合蛋白激酶Bub 1在有丝分裂期间执行两个关键功能:它对于纺锤体检查点信号传导和正确的染色体排列是必不可少的。有趣的是,在癌组织和癌细胞系中发现了Bub 1突变。使用同基因RNA干扰互补系统在转化的HeLa细胞和未转化的RPE 1细胞中,我们调查的结构Bub 1突变体对染色体分离的影响。我们证明,Bub 1调节有丝分裂通过相同的机制,在两个细胞系,这表明一个共同的监管网络。令人惊讶的是,Bub 1可以调节染色体分离的动力学无关的方式,虽然在较低的效率。它的激酶活性对于染色体排列至关重要,但在纺锤体检查点信号传导中仅起次要作用。我们还确定了Bub 1(氨基酸458-476)内的一个新的保守基序,这是必不可少的纺锤体检查点信号,但不调节染色体排列,我们表明,几个癌症相关的Bub 1突变体损害染色体分离,这表明可能与肿瘤发生。
The kinetochore-bound protein kinase Bub1 performs two crucial functions during mitosis: it is essential for spindle checkpoint signaling and for correct chromosome alignment. Interestingly, Bub1 mutations are found in cancer tissues and cancer cell lines. Using an isogenic RNA interference complementation system in transformed HeLa cells and untransformed RPE1 cells, we investigate the effect of structural Bub1 mutants on chromosome segregation. We demonstrate that Bub1 regulates mitosis through the same mechanisms in both cell lines, suggesting a common regulatory network. Surprisingly, Bub1 can regulate chromosome segregation in a kinetochore-independent manner, albeit at lower efficiency. Its kinase activity is crucial for chromosome alignment but plays only a minor role in spindle checkpoint signaling. We also identify a novel conserved motif within Bub1 (amino acids 458–476) that is essential for spindle checkpoint signaling but does not regulate chromosome alignment, and we show that several cancer-related Bub1 mutants impair chromosome segregation, suggesting a possible link to tumorigenesis.
DOI: 10.1016/j.devcel.2008.11.004
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