原始识别复合体有序和无序区域的直接差异 in vivo 结合在不同的动图序列
Michal Chappleboim1, Segev Naveh-Tassa2, Miri Carmi1
1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot, Israel.
Nucleic acids research
|April 10, 2024
概括
起源识别复合体 (ORC) 使用无序的基本补丁来绑定酵母中的DNA复制起源. 不同的ORC元素在各种基因组部位指导结合,揭示了关键的DNA识别机制.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 生物化学 生物化学
背景情况:
- 原始识别复合体 (ORC) 通过在复制原点与特定的DNA序列结合来启动DNA复制.
- 发芽的酵母复制起源通常含有保存的17bpDNA图案.
- 结构研究确定了参与DNA结合的两个关键ORC元素:Orc1-BP4和Orc4-IH.
研究的目的:
- 确定特定ORC元素在不同基因组位置的DNA结合中的体内作用.
- 阐明ORC-DNA在复制原点和其他地点的识别机制.
主要方法:
- 在芽酵母中对38个设计的起源识别复合体 (ORC) 突变体进行基因组映射.
- 分析ORC结合和在复制起源和沉默相关站点的活性.
- ORC-DNA相互作用的结构和功能特征.
主要成果:
- 不同的ORC元素在不同的基因组位点中介于DNA结合.
- 在缺乏正典动机的沉默相关站点上,ORC绑定受BAH域的管理.
- 两个复制原型变体表现出不同的结合模式,失序的基本补丁 (Orc1-BP4,Orc1-BP3) 对于模式识别至关重要.
结论:
- 无序的基本补丁对于原产地识别复合体 (ORC) 动图在体内结合至关重要.
- 在ORC中保存的,小沟相互作用的元素有助于特定的DNA识别.
- 这项研究阐明了ORC-DNA相互作用的体内机制,这对于复制启动至关重要.
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