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调解器头模块的架构
Tsuyoshi Imasaki1, Guillermo Calero, Gang Cai
1Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, 635 Barnhill Drive, Indianapolis, Indiana 46202, USA.
Nature
|July 5, 2011
概括
研究人员确定了基本的中间体头模块的晶体结构,揭示了其在真核转录调节中的架构和功能. 这一发现推动了我们对RNA聚合酶II (Pol II) 在基因表达过程中如何被招募和调节的理解.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 媒介是真核转录的关键调节者,将DNA结合的调节元素与RNA聚合酶II (Pol II) 联系起来.
- 在Saccharomyces cerevisiae中介体复合体由25个子单元组成,分为头部,中部/手臂和尾部模块.
- 有限的结构信息阻碍了对调解员大会及其监管作用的理解.
研究的目的:
- 为了确定基本的调解器头部模块的晶体结构.
- 阐明介质组件的结构基础和转录调节中的功能.
- 了解调解器头模块在促进Pol II酸化中的作用.
主要方法:
- 使用X射线晶体学来确定中介器头部模块的结构.
- 结构分析揭示了不同的领域和一个中央螺旋捆.
- 功能性数据与结构性发现相结合.
主要成果:
- 调解器头模块 (223千多) 的晶体结构以4.3的分辨率确定.
- 该结构揭示了三个域,其完整性是由五个子单位的十个螺旋组成的捆绑维持的.
- 头模块为转录因子和Pol II提供结合点,并促进Pol II的碳基终端域化.
结论:
- 调解器头模块的结构揭示了转录调节所必需的架构原则.
- 头模块的相互作用稳定了它的组装,并促进了与转录机械的相互作用.
- 这种结构性的洞察力是理解调解者在基因表达调节中的作用的关键.
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