Destroying the ring: Freeing DNA from Ku with ubiquitin.

Destroying the ring: Freeing DNA from Ku with ubiquitin.
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DOI:
10.1016/j.febslet.2011.05.046
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发表时间:
2011-09-16
期刊:
影响因子:
3.5
通讯作者:
Postow L
Postow L
中科院分区:
生物学3区
文献类型:
--
作者:
Postow L

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Ku异源二聚体由蛋白质Ku70和Ku80组成,是双链断裂(DSB)修复的非同源末端连接(NHEJ)途径的中心组分。Ku能够凭借其环状结构识别和结合DSB。修复前和修复后拓扑捕获的Ku异二聚体都被认为对多种细胞过程具有抑制作用。因此,预测存在从染色质中去除Ku的调节机制。最近的证据表明,Ku80通过泛素介导的过程从DNA中去除。类似的过程已被证明参与了其他蛋白质从染色质的宿主的调节性解离,并且这似乎是染色质相关因子的调节的一般和保守的机制。这一途径的一个潜在的机制进行了讨论。
The Ku heterodimer, consisting of the proteins Ku70 and Ku80, is the central component of the nonhomologous end joining (NHEJ) pathway of double strand break (DSB) repair. Ku is able to recognize and bind a DSB by virtue of its ring-like structure. Both pre-repair and topologically trapped post-repair Ku heterodimers are thought to be inhibitory to multiple cellular processes. Thus, a regulated mechanism for the removal of Ku from chromatin was predicted to exist. Recent evidence shows that Ku80 is removed from DNA through a ubiquitin-mediated process. Similar processes have been shown to be involved in the regulated dissociation of a host of other proteins from chromatin, and this appears to be a general and conserved mechanism for the regulation of chromatin-associated factors. A potential mechanism for this pathway is discussed.
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