WT1 interacts with MAD2 and regulates mitotic checkpoint function.

WT1 interacts with MAD2 and regulates mitotic checkpoint function.
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DOI:
10.1038/ncomms5903
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发表时间:
2014-09-18
影响因子:
16.6
通讯作者:
Roberts, Stefan G. E.
Roberts, Stefan G. E.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Shandilya, Jayasha;Toska, Eneda;Richard, Derek J.;Medler, Kathryn F.;Roberts, Stefan G. E.

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肿瘤抑制因子通过转录调节编码有丝分裂检查点复合物(MCC)组分的基因来保护有丝分裂检查点的保真度。在这里,我们报告了一个新的作用,肿瘤抑制因子和转录因子,WT 1,在有丝分裂检查点。我们表明,WT 1调节MCC直接与纺锤体组装检查点蛋白,MAD 2。WT 1在有丝分裂过程中与MAD 2共定位,并优先结合功能活性的封闭构象异构体C-MAD 2。此外,WT 1与含有MAD 2、BUBR 1和CDC 20的MCC结合,导致后期促进复合物/细胞周期体(APC/C)的延长抑制,以及其底物Bclin和Cyclin B1的延迟降解。值得注意的是,RNAi介导的WT 1缺失会导致BMPIN的周转增加,到后期的滞后时间减少,以及染色体分离缺陷。我们的研究结果确定WT 1作为有丝分裂检查点和染色体稳定性的调节剂。
Tumor suppressors safeguard the fidelity of the mitotic checkpoint by transcriptional regulation of genes that encode components of the mitotic checkpoint complex (MCC). Here we report a new role for the tumor suppressor and transcription factor, WT1, in the mitotic checkpoint. We show that WT1 regulates the MCC by directly interacting with the spindle assembly checkpoint protein, MAD2. WT1 colocalizes with MAD2 during mitosis and preferentially binds to the functionally active, closed-conformer, C-MAD2. Furthermore, WT1 associates with the MCC containing MAD2, BUBR1 and CDC20, resulting in prolonged inhibition of the anaphase promoting complex/cyclosome (APC/C), and delayed degradation of its substrates SECURIN and CYCLIN B1. Strikingly, RNAi-mediated depletion of WT1 leads to enhanced turnover of SECURIN, decreased lag time to anaphase, and defects in chromosome-segregation. Our findings identify WT1 as a regulator of the mitotic checkpoint and chromosomal stability.
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