H3K4me3与TAF3的相互作用调节了预启动复合体组合和选择性基因激活.
Shannon M Lauberth1, Takahiro Nakayama, Xiaolin Wu
1Laboratory of Biochemistry and Molecular Biology, The Rockefeller University, New York, NY 10065, USA.
Cell
|March 5, 2013
概括
基因组标记H3K4me3引导转录因子TFIID到活跃的基因,增强p53驱动的基因表达. 这种机制确保在基因毒性压力期间快速诱导p53向基因.
科学领域:
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因规则 基因规则
背景情况:
- 基质子修饰控制基于染色体的过程,但它们的具体作用尚未完全理解.
- 在lysine 4 (H3K4me3) 中三甲基化素H3与活性基因有关,并通过像TFIID这样的效应蛋白帮助转录.
研究的目的:
- 阐明H3K4me3影响基因转录的机制,特别是在p53点基因的背景下.
- 研究H3K4me3-TAF3相互作用在指导TFIID招募和预启动复合体形成中的作用.
主要方法:
- 研究了H3K4me3和TAF3之间的相互作用,TAF3是TFIID的组成部分.
- 分析了H3K4me3对p53-依赖转录和预启动复合体 (PIC) 形成的影响.
- 研究了H3K4me3,TAF3,TATA盒和PIC组件在基因调节中的相互作用.
主要成果:
- H3K4me3-TAF3相互作用对于全球TFIID对活性基因的招募至关重要,包括p53点.
- H3K4me3通过促进PIC形成来增强p53依赖的转录,独立或与TATA盒一起起作用.
- H3K4me3-TAF3/TFIID相互作用调节p53的基因选择功能,以应对基因毒性压力.
结论:
- H3K4me3作为一个关键调节器,通过TAF3/TFIID相互作用指导PIC组件.
- 这种机制有助于在基因毒性压力时快速诱导特定的p53点基因.
- 这项研究揭示了一条用于表观遗传控制基因转录和细胞反应的新途径.
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