通过SETD2进行共转录H3K36甲基化的分子机制
James L Walshe1, Moritz Ochmann2, Ute Neef2
1Department of Molecular Biology, Max Planck Institute for Multidisciplinary Sciences, Göttingen, Germany. james.walshe@mpinat.mpg.de.
Nature communications
|October 30, 2025
概括
基因组H3 lysine 36三甲基化 (H3K36me3) 标记了活跃的基因. 研究人员揭示了SETD2介导的H3K36me3沉积与转录和RNA聚合酶II通道相结合的三步机制.
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:
- H3K36me3是一种关键的表观遗传标记,与活跃的基因转录有关.
- 这种修改对于维持细胞记忆和身份至关重要.
- SETD2是主要的甲基转移酶,负责H3K36me3沉积.
研究的目的:
- 通过SETD2.2.阐明H3K36me3沉积的分子机制.
- 了解RNA聚合酶II (RNAPII) 和相关因素在这个过程中的作用.
- 在转录过程中可视化SETD2,RNAPII和核细胞之间的动态相互作用.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定高分辨率结构.
- 对SETD2与RNAP II延伸复合体结合的结构分析.
- 功能性测试以探测H3K36me3沉积的机制.
主要成果:
- 三个冷EM结构显示SETD2与RNAP II在核细胞穿越的不同阶段相互作用.
- 提出了一种转录合H3K36me3沉积的三步机制.
- SPT6绑定SETD2,RNAP II通道促进了六体转移,随后的转录驱动了顺序的H3尾部甲基化.
结论:
- 这项研究为H3K36me3如何以转录依赖的方式沉积提供了一个机制框架.
- 这种机制突出了SETD2,RNAP II,SPT6和FACT在调节基因表达中的协调作用.
- 了解这一过程对于理解基因调节和细胞分化至关重要.
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