包括所有11个指在内的CTCF-DNA复合物的结构
Jie Yang1, John R Horton1, Bin Liu1
1Department of Epigenetics and Molecular Carcinogenesis, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA.
Nucleic acids research
|July 13, 2023
概括
CCCTC-结合因子 (CTCF) 使用其指 (ZF) 域来结合DNA. 结构分析揭示了ZF1-ZF7和ZF8-ZF11在识别DNA序列中的不同角色,解释了高亲和度结合.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 基因组学就是基因组学.
背景情况:
- CCCTC结合因子 (CTCF) 是一种关键的转录因子,通过结合增强剂和促进剂来调节基因表达.
- CTCF利用一个11-tandem指 (ZF) DNA结合域来识别特定的DNA序列.
- CTCF绑定站点通常包括一个CORE序列加上额外的上游或下游动机.
研究的目的:
- 阐明CTCF的DNA结合机制的结构基础.
- 描述CTCF内部不同ZF子组的不同角色.
- 了解结构变异如何促进高亲和度CTCF-DNA相互作用.
主要方法:
- 使用X射线晶体学来确定与DNA结合的人类CTCF碎片的结构.
- 解决了两个结构:一个是ZF1-ZF7,另一个是ZF3-ZF11.
- DNA 序列包括具有 3' 下游或 5' 上游元素的 CORE 基因.
主要成果:
- ZF1-ZF7通过跟随其主要槽扭曲来结合DNA,识别基三胞胎.
- 在小槽中,ZF8充当间隔器,将ZF9-ZF11定位为跨链DNA接触.
- 在 -6 和 -5 位置的残留物差异区分ZF1-ZF7 (小残留物) 和ZF8-ZF11 (较大,充电的残留物).
- ZF8的基本氨基酸形成盐桥与DNA酸盐在小沟.
- 特定的基因识别相互作用,包括Arg-Guanine和Gln-Adenine,在跨链接触中被保留.
结论:
- ZF1-ZF7和ZF8-ZF11之间的结构差异解释了不同的DNA结合方式.
- 这些结构变异是CTCF识别高亲和度结合点的能力的关键.
- 这些发现为了解CTCF介导的基因调节提供了结构性框架.
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