CSL-Notch-Mastermind三元复合物的晶体结构与DNA结合在一起
Jeffrey J Wilson1, Rhett A Kovall
1Department of Molecular Genetics, Biochemistry, and Microbiology, University of Cincinnati College of Medicine, Cincinnati, OH 45267, USA.
这项研究揭示了关键的Notch信号复合体的结构. 这一发现解释了CSL蛋白如何在发育过程中从抑制转录转换为激活基因转录.
科学领域:
- 分子生物学分子生物学
- 发展生物学 发展生物学
- 结构生物学 结构生物学
背景情况:
- 痕信号对于细胞通信,胚胎模式和发育至关重要.
- CSL (CBF1/Su(H) /Lag-1) 是一种转录因子,通过与共调剂相互作用来调节Notch目标基因.
- 转录激活涉及从CSL通过Notch细胞内域 (NotchIC) 取代核心压缩剂,并招募大脑协同激活剂.
研究的目的:
- 确定由CSL,NotchIC和大脑与DNA结合而形成的三元复合体的结构.
- 为了阐明基底的分子机制口介导的转录激活.
主要方法:
- 使用X射线晶体学来确定三元复合体的3.1 Å结构.
- 在复合体内的蛋白质-蛋白质相互作用的分析.
主要成果:
- 正如预测的那样,Notch的RAM域与CSL的β三叶子域相互作用.
- CSL的C端域在与Notch ankyrin重复和Mastermind的接口中扮演着关键的,意想不到的角色.
- 三元复合物的形成会导致CSL的显著构造变化.
结论:
- 该结构为CSL如何从抑制剂转变为激活剂提供了分子基础.
- 突出了CSL C终端域在调解转录激活相互作用中的关键作用.
- 提供了关于Notch信号通路对基因表达的调节的见解.
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