The kinetochore protein Bub1 participates in the DNA damage response.

The kinetochore protein Bub1 participates in the DNA damage response.
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DOI:
10.1016/j.dnarep.2011.10.018
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发表时间:
2012-02-01
期刊:
影响因子:
3.8
通讯作者:
Xu, Bo
Xu, Bo
中科院分区:
医学3区
文献类型:
--
作者:
Yang, Chunying;Wang, Haibo;Xu, Yiran;Brinkman, Kathryn L.;Ishiyama, Hiromichi;Wong, Stephen T. C.;Xu, Bo

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DNA损伤反应(DDR)和纺锤体组装检查点(SAC)是哺乳动物细胞维持基因组稳定性的两种重要机制。越来越多的证据表明,DDR元件和SAC元件是串扰的。在这里,我们报道了Bub1(出芽不受苯并咪唑抑制),SAC必需的关键着丝点蛋白之一,是最佳ddr所必需的。我们发现,敲低Bub1会导致H2AX焦点延长、彗星尾形成以及对电离辐射(IR)的超敏反应。此外,我们发现bub1介导的组蛋白H2A苏氨酸121磷酸化在IR后以atm依赖的方式诱导。我们证明了ATM在体内对DNA损伤的反应中磷酸化了丝氨酸314上的Bub1。最后,我们发现atm介导的Bub1丝氨酸314磷酸化是ir诱导的Bub1激活和最佳DDR所必需的。总之,我们阐明了DNA损伤诱导的Bub1激活的分子机制,并强调了Bub1在DDR中的关键作用。
The DNA damage response (DDR) and the spindle assembly checkpoint (SAC) are two critical mechanisms by which mammalian cells maintain genome stability. There is a growing body of evidence that DDR elements and SAC components crosstalk. Here we report that Bub1 (Budding Uninhibited by Benzimidazoles 1), one of the critical kinetochore proteins essential for SAC, is required for optimal DDRs. We found that knocking-down Bub1 resulted in prolonged H2AX foci and comet tail formation as well as hypersensitivity in response to ionizing radiation (IR). Further, we found that Bub1-mediated Histone H2A Threonine 121 phosphorylation was induced after IR in an ATM-dependent manner. We demonstrated that ATM phosphorylated Bub1 on serine 314 in response to DNA damage in vivo. Finally, we showed that ATM-mediated Bub1 serine 314 phosphorylation was required for IR-induced Bub1 activation and for the optimal DDR. Together, we elucidate the molecular mechanism of DNA damage-induced Bub1 activation and highlight a critical role of Bub1 in DDR.
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