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Updated: Jan 6, 2026

Mitochondria

Mitochondria

顶BP1激活了ATR-ATRIP复合体的作用

Akiko Kumagai¹, Joon Lee, Hae Yong Yoo

¹Division of Biology 216-76, California Institute of Technology, Pasadena, CA 91125, USA.

|March 15, 2006

概括

拓酶结合蛋白1 (TopBP1) 激活ATR激酶,这是DNA损伤和复制检查点的关键酶. 这一发现揭示了控制ATR活性在细胞周期调节中的关键机制.

科学领域:

分子生物学分子生物学
细胞生物学细胞生物学
生物化学生物化学

背景情况:

控制ATR的激酶活性的精确机制 ( Ataxia Telangiectasia 和 Rad3相关) 仍然在很大程度上是未知的.
ATR是DNA复制和损伤检查点反应的中央调节器.
TopBP1 (拓酶结合蛋白1) 涉及DNA复制启动和检查点控制.

研究的目的:

阐明ATR激酶活性受调节的机制.
确定TopBP1在ATR激活和检查点信号中的作用.

主要方法:

重组表达和净化Xenopus和人类ATR和TopBP1蛋白质.
在体外激酶试验测量在TopBP1.1的存在下测量ATR活性.
使用Xenopus蛋提取物和人类细胞系对ATR激活的分析.
位点定向的突变发生,以非激活TopBP1.1的假定ATR激活域.

主要成果:

重组TopBP1显著增强了Xenopus和人类ATR的激酶活性.
在TopBP1内部,与其BRCT重复分开的特定保存域负责ATR激活.
孤立的TopBP1的ATR激活域可以在细胞提取物和完整细胞中异位激活ATR信号.
一个具有非活化的ATR激活域的TopBP1突变破坏了Xenopus蛋提取物中的检查点调节.

结论:

TopBP1是ATR激酶活性的一个关键激活剂.
TopBP1和ATR之间的相互作用对于启动ATR依赖的信号通路至关重要.
这一发现为DNA损伤和复制检查点的调节提供了基本的见解.

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