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Spo11核心复合体的冷EM结构与DNA结合在一起

You Yu^1,2, Juncheng Wang^1,3, Kaixian Liu⁴

¹Structural Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.

Nature structural & molecular biology

|September 20, 2024

概括

揭示了在变化过程中DNA双链断裂形成的结构性见解. 我们可视化了与DNA结合的Saccharomyces cerevisiae Spo11酶复合体,澄清了DNA结合特异性和裂变偏好.

科学领域:

分子生物学分子生物学
结构生物学结构生物学
遗传学是一个遗传学.

背景情况:

介质性重组是通过与土酶相关的酶Spo11产生的DNA双链断裂 (DSB) 启动的.
保存的辅助因素支持Spo11在DSB形成中的功能.
缺少Spo11-DNA复合体的高分辨率结构数据,限制了对其架构和DNA相互作用的理解.

研究的目的:

为了确定与DNA结合的Spo11核心复合物的高分辨率结构.
阐明Spo11.11的DNA末端结合特异性和裂变偏好背后的分子机制.
调查辅助因素和金属离子在Spo11功能中的作用.

主要方法:

使用冷电子显微镜 (cryo-EM) 来获得Saccharomyces cerevisiae Spo11核心复合物的结构,其中有Rec102,Rec104和Ski8与DNA结合.
结构的分辨率高达3.3-Å分辨率.
用酵母中的功能数据来支持结构性发现.

主要成果:

高分辨率的冷EM结构揭示了Spo11的单质核心复合体,广泛与DNA骨干结合.
这些结构详细介绍了与深陷的3'-OH和第一个5'悬浮的核酸的相互作用,定义了DNA末端结合特异性.
发现了金属离子在DNA结合中的作用以及Top6BL同类物中的结构变异.

结论:

确定的结构为Spo11-DNA相互作用提供了前所未有的分子细节,解释了DNA末端识别.
这些发现为Spo11.的体内DNA裂变偏好提供了关键的见解.
这项研究揭示了Spo11复杂架构的保存和可变特征,进步了我们对介质DSB形成的理解.

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