基因素脱乙酶复合体Rpd3S与核细胞组结合的结构
Wulong Li1, Hengjun Cui1, Zhimin Lu2,3
1Cancer Institute (Key Laboratory of Cancer Prevention and Intervention, China National Ministry of Education) of the Second Affiliated Hospital and Institute of Translational Medicine, Zhejiang University School of Medicine, Hangzhou, China.
Nature structural & molecular biology
|October 5, 2023
概括
该Rpd3S脱乙酶复合物向H3K36me3核细胞,以防止异常转录. 结构分析揭示了Sin3,Rco1和Eaf3子单元如何协调结合染色素和脱乙酸基因素.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因基因.
- 该Rpd3S脱乙酶复合物被招募到H3K36甲基化核细胞中,以抑制密码转录.
- 人们对Rpd3S的组装和基板识别机制的了解仍然很少.
研究的目的:
- 阐明Rpd3S复合组合的结构基础及其与H3K36me3-修饰核细胞的相互作用.
- 了解Rpd3S如何识别和结合其染色素基质.
- 揭示Rpd3S复合物的脱乙化机制.
主要方法:
- 进行X射线晶体学以确定与核体结合的Saccharomyces cerevisiae Rpd3S的结构.
- 高分辨率结构分析 (3.1 Å) 以可视化子单元相互作用和DNA结合.
主要成果:
- 该结构揭示Sin3和Rco1子单元指挥Rpd3S组装和核细胞结合,其中Sin3-DNA相互作用作为关键.
- Rco1的PHD1域识别了H3K4,将H3尾部定位为Rpd3脱化.
- Eaf3的染色体与H3K36me3结合,并与核细胞和链接DNA相互作用,第二个Eaf3-Rco1副本与相邻的核细胞结合.
结论:
- 这项研究揭示了RPd3S染色体向和脱乙烯化背后的结构机制.
- Sin3,Rco1和Eaf3在基质识别和复杂组装中发挥着关键作用.
- 这项工作提供了对转录延长的表观遗传调节的见解.
相关概念视频
01:12The Nucleosome Core Particle
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Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
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01:19The Nucleosome
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02:38Heterochromatin
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02:54Nucleosome Remodeling
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02:32Histone Modification
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Acetylation
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02:25Spreading of Chromatin Modifications
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