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发芽酵母基因组的高分辨率蛋白质结构
Matthew J Rossi1, Prashant K Kuntala1, William K M Lai1,2
1Center for Eukaryotic Gene Regulation, Department of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA, USA.
Nature
|March 11, 2021
概括
研究人员绘制了酵母中的染色质蛋白结构图,揭示了DNA复制,中间体和转录的不同结构. 这项工作定义了控制基因调节和染色体维护的关键蛋白相互作用.
科学领域:
- 分子生物学
- 基因组学
- 染色体生物学
背景情况:
- 染色质相关蛋白质的全基因组结构对于染色体完整性和基因调节至关重要,但仍未完全定义.
- 了解这些蛋白质复合体对于破译基本细胞过程至关重要.
研究的目的:
- 在Saccharomyces cerevisiae中定义染色体相关蛋白质的全基因组结构.
- 阐明参与DNA复制,中间体和转录的蛋白质复合体的结构组织.
主要方法:
- 使用染色体免疫沉,外核酶消化和DNA测序 (ChIP-exo/seq).
- 蛋白质元组合及其基因组位置的识别和表征.
主要成果:
- 确定了21个蛋白质元组件 (约. 与DNA复制,中粒体,亚端粒体,转子体和RNA聚合酶转录有关.
- 描述了不同的核体结构:复制蛋白吞核体,中间体缺乏核体,压制蛋白在亚端粒X元素上覆盖了三个核体.
- 具有特征的促销器架构:构造性促销器具有短核素无区域 (NFR) 和+1核素结合 TFIID,而诱导性促销器则利用序列特定的转录因子 (ssTF) 来创建核素枯竭区域 (NDR).
结论:
- 通过SSTF定义了一个高度集成的基因调节网络,区分基因诱导和构成性转录的机制.
- 在基因诱导中展示了TFIID在构成性转录和ssTF/辅因子中的独特作用,没有检测到ssTF和TFIID之间的稳定相互作用.
- 提供了染色体结构及其在基因调节中的作用的综合模型,强调了蛋白质复合体和DNA元素之间的相互作用.
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