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Nbs1灵活地绑定Ctp1和Mre11-Rad50以协调DNA双链断裂处理和修复
R Scott Williams1, Gerald E Dodson, Oliver Limbo
1Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
Cell
|October 7, 2009
概括
尼姆海根破裂综合征1 (Nbs1) 蛋白质
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 结构生物学 结构生物学
背景情况:
- 包括Nbs1亚单元在内的Mre11-Rad50-Nbs1 (MRN) 综合体对于保持基因组完整性至关重要.
- Nbs1通过与ATM,MDC1和Sae2/Ctp1/CtIP的相互作用来协调DNA双链断裂 (DSB) 修复和检查点信号.
- 这些相互作用的精确结构基础以及Nbs1在招募修复因素中的作用在很大程度上仍未确定.
研究的目的:
- 阐明Nbs1的结构特征及其与关键DNA修复蛋白的相互作用.
- 了解Nbs1在DSB修复和基因组稳定中的功能背后的分子机制.
- 为了研究尼米根断裂综合征突变的结构基础.
主要方法:
- 用X射线晶体学和小角度X射线散射 (SAXS) 来确定Nbs1结构.
- 基因和生化分析研究Nbs1-Ctp1复合物的形成和功能.
- 对Nbs1-Ctp1复合物的结构分析.
主要成果:
- 定义了Nbs1的融合,扩展的FHA-BRCT(1)-BRCT(2) 域结构,与Mre11和ATM结合动机联系在一起.
- 揭示了Nbs1通过FHA域与Ctp1 pThr-Asp动机的相互作用将化Ctp1招募到DSB.
- 确定了一个广泛的FHA-BRCT接口,一个双边的MDC1绑定支架,以及Nbs1中的构造交换机,这对尼米根断裂综合征突变有影响.
结论:
- 对Nbs1的结构洞察力揭示了其招募Ctp1到DSB的机制.
- 灵活的Nbs1臂绑定Ctp1表明局部DNA末端处理和同源重组.
- 了解Nbs1的结构和功能,可以了解基因组稳定性和尼米根断裂综合征.
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