基本的Rec114-Mei4三元体接口的结构和DNA桥接活动
Kaixian Liu1, Emily M Grasso2, Stephen Pu1
1Molecular Biology Program, Memorial Sloan Kettering Cancer Center, New York, New York 10065, USA.
Genes & development
|July 13, 2023
概括
Rec114和Mei4蛋白质形成了重要的复合体,可以调节变过程中的DNA双链断裂. 结构和单分子研究揭示了这些复杂物如何结合DNA并形成凝聚物,这对于重组至关重要.
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:
- 介质重组开始于DNA双链断裂 (DSB).
- Rec114和Mei4 (RM) 蛋白质是空间和时间调节DSB形成的保守因素.
- 在体内,RM蛋白质形成与染色体结构集成的大焦点;在体内,它们形成与DNA结合并形成凝聚物的异构复合体.
研究的目的:
- 阐明RM复合体的原子结构和动态DNA结合特性.
- 了解 RM 介导的冷凝物形成和 DSB 调节背后的分子机制.
主要方法:
- 核磁共振 (NMR) 实验以确定最小的Rec114-Mei4复合物的结构.
- 单分子实验分析DNA结合和产生力的能力.
- AlphaFold2用于预测正统RM复合体的结构模型.
主要成果:
- 确定了异构三元体 Rec114 C-终端/Mei4 N-终端复合物的结构模型,足以进行DNA结合和凝结物形成.
- 最小的复杂性桥梁多个DNA复合体,并通过长距离相互作用产生DNA凝聚力的力量.
- AlphaFold2成功地预测了各种RM正统模型的保存结构模型.
结论:
- 最小的Rec114-Mei4复合体显示了保存的蛋白质-蛋白质和蛋白质-DNA相互作用,驱动了凝结物形成.
- 这些相互作用对于调节介质性DSB形成和确保适当的重组至关重要.
- 对RM复合体的结构洞察力有助于更好地了解介质过程和基因组稳定性.
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