人类PRC2及其辅因子AEBP2和JARID2的结构
Vignesh Kasinath1,2, Marco Faini3, Simon Poepsel1,2
1QB3 Institute, Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA.
概括
聚抑制复合体2 (PRC2) 甲基化对于发育至关重要. 低温EM结构揭示了JARID2和AEBP2如何通过模仿基因组尾巴来调节PRC2活动,从而提供了对复杂结构和调节的见解.
科学领域:
- 表观遗传学和基因调控
- 结构生物学
- 发展的分子机制
背景情况:
- 聚合物抑制复合物2 (PRC2) 催化了基因组H3氨酸27甲基化,这是转录抑制的关键表观遗传标记.
- 这种甲基化对于细胞分化,发育和维持细胞身份至关重要.
- PRC2活动的失调与发育障碍和癌症有关.
研究的目的:
- 在基底和活性状态下确定人类PRC2的高分辨率结构.
- 阐明JARID2和AEBP2辅因子调节PRC2活动的结构机制.
- 提供PRC2复杂架构及其监管的全面结构理解.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于可视化人类的PRC2复合体.
- 在基底和辅因子结合的活性状态下对PRC2进行结构分析.
- 生物化学测试以确认辅因子相互作用和功能影响.
主要成果:
- 在基底和两个不同的活性状态中报告了人体PRC2的冷EM结构.
- 证明 JARID2 和 AEBP2 模仿 histone H3 尾部以调节 PRC2.
- JARID2通过模仿甲基化H3尾部来刺激PRC2; AEBP2与RBAP48相互作用,模仿未经修改的H3尾部.
- 确定了SUZ12作为稳定整个PRC2组件的关键子单位.
结论:
- 定义了一个功能相关的PRC2复合体的完整架构.
- 提供了一个结构框架,以了解由辅因子,基因组尾和RNA调节的PRC2.
- 结构性见解为针对PRC2相关疾病的有针对性的治疗策略铺平了道路.
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