基质子修饰驱动的结构重塑释放了DNA甲基化中的DNMT3B
Chao-Cheng Cho1, Hsun-Ho Huang1,2, Bo-Chen Jiang1
1Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan 11529, ROC.
Science advances
|March 26, 2025
概括
质子修饰动态调节DNA甲基转移酶3B (DNMT3B) 的活性. 特定的组织蛋白标记触发了DNMT3B的结构变化,增强了其DNA甲基化功能.
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
- 生物化学 生物化学
背景情况:
- DNA甲基转移酶3B (DNMT3B) 对于哺乳动物发育中的DNA甲基化模式至关重要.
- 通过基因素修改对DNMT3B的调节还没有完全理解.
- 基因组基因修饰会影响基因表达和染色体结构.
研究的目的:
- 为了研究DNMT3B和基因素修饰之间的动态相互作用.
- 阐明基因组修饰调节DNMT3B活性的机制.
- 探索DNMT3B在DNA甲基化中的形状变化的作用.
主要方法:
- 在体外测试中使用修饰的素H3.
- 采用结构生物学技术观察蛋白质动态.
- 分析了野生类型和突变DNMT3B的甲基转移酶活性.
主要成果:
- DNMT3B的PWWP域在与H3K4me0和K36me3相互作用时显示出动态构造变化.
- 对PWWP和ADD领域的质子修饰触发了从自抑制转变为活性构造的转变.
- 活性构造促进与H3和DNA的同时相互作用,增强甲基化.
- 一种与前列腺癌相关的DNMT3B突变 (R545C) 呈现出增强的活力和异常的超甲基化.
结论:
- 质子修饰作为DNMT3B形状重排的触发剂.
- 这些重新排列通过特定的域相互作用释放DNMT3B的DNA甲基化活性.
- 异常的DNMT3B动态,如在R545C突变体中所见,可以导致病态DNA超甲基化.
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