Aurora-B mediated ATM serine 1403 phosphorylation is required for mitotic ATM activation and the spindle checkpoint.

Aurora-B mediated ATM serine 1403 phosphorylation is required for mitotic ATM activation and the spindle checkpoint.
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DOI:
10.1016/j.molcel.2011.09.016
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发表时间:
2011-11-18
期刊:
影响因子:
16
通讯作者:
Xu, Bo
Xu, Bo
中科院分区:
生物学1区
文献类型:
--
作者:
Yang, Chunying;Tang, Xi;Guo, Xiaojing;Niikura, Yohei;Kitagawa, Katsumi;Cui, Kemi;Wong, Stephen T. C.;Fu, Li;Xu, Bo

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ATM激酶在维持遗传稳定性中起着关键作用。ATM在DNA损伤时被激活,对细胞周期检查点至关重要。在这里,我们报道了在没有DNA损伤的情况下,ATM在有丝分裂中被激活。我们证明有丝分裂ATM的激活依赖于Aurora-B激酶,Aurora-B使ATM的丝氨酸1403磷酸化。这个磷酸化事件是有丝分裂ATM激活所必需的。此外,我们发现ATM功能的丧失导致有丝分裂时间缩短和纺锤体检查点缺陷,而ATM Ser1403磷酸化的取消导致纺锤体检查点缺陷。我们还证明,有丝分裂激活的ATM磷酸化了Ser314上的Bub1,这是一种关键的着丝点蛋白。atm介导的Bub1 Ser314磷酸化是Bub1活性所必需的,也是激活纺锤体检查点的必要条件。总的来说,我们的数据强调了ATM在有丝分裂中的一个关键功能的机制。
The ATM kinase plays a critical role in the maintenance of genetic stability. ATM is activated in response to DNA damage and is essential for cell cycle checkpoints. Here, we report that ATM is activated in mitosis in the absence of DNA damage. We demonstrate that mitotic ATM activation is dependent on the Aurora-B kinase and that Aurora-B phosphorylates ATM on serine 1403. This phosphorylation event is required for mitotic ATM activation. Further, we show that loss of ATM function results in shortened mitotic timing and a defective spindle checkpoint, and that abrogation of ATM Ser1403 phosphorylation leads to this spindle checkpoint defect. We also demonstrate that mitotically-activated ATM phosphorylates Bub1, a critical kinetochore protein, on Ser314. ATM-mediated Bub1 Ser314 phosphorylation is required for Bub1 activity and is essential for the activation of the spindle checkpoint. Collectively, our data highlight mechanisms of a critical function of ATM in mitosis.
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