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通过凝聚环确定DNA-DNA相互作用
Yasuto Murayama1, Catarina P Samora2, Yumiko Kurokawa3
1Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan.
Cell
|January 24, 2018
概括
像凝聚素这样的染色体结构维护 (SMC) 复合物可以结合和绑定两个单独的DNA分子. 这一过程需要单链DNA,对于建立姐妹染色体凝聚力至关重要.
科学领域:
- 分子生物学
- 遗传学
- 生物化学
背景情况:
- 染色体结构维护 (SMC) 复合体是形成参与DNA组织的环结构的ATPase.
- 这些复合体在染色体凝聚,姐妹染色体凝聚,DNA修复和基因调节中起着关键作用.
- 据信SMC复合体通过调解多个DNA分子之间的相互作用来起作用.
研究的目的:
- 研究凝聚素复合体建立DNA-DNA相互作用的机制.
- 通过纯化裂变酵母凝聚素复合体来证明DNA-DNA结合.
- 阐明建立姐妹染色体凝聚力的分子模型.
主要方法:
- 裂变酵母凝聚素复合物的净化
- 在体外实验中评估凝聚素的DNA结合和结合能力.
- 对合载体复合物的ATP依赖性测定和要求研究.
- 在将不稳定的ssDNA-dsDNA凝聚力转化为稳定的dsDNA凝聚力的过程中对DNA合成的分析.
主要成果:
- 纯化的裂变酵母凝聚体显示了DNA-DNA结合.
- 凝聚素在拓上捕获第二个DNA分子,特别是单链DNA (ssDNA),以ATP依赖的方式.
- 这种捕获需要凝聚载体复合体,并且最初是不稳定的,通过DNA合成成为稳定的dsDNA凝聚.
结论:
- 以凝聚素为例的SMC复合体可以调节第二个DNA分子的捕获.
- 这一过程突出了ssDNA在凝聚性介导的DNA结合中的作用.
- 这为理解姐妹染色体凝聚的建立提供了一个分子框架.
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