通过单个子单位二维基因酶USP16进行核细胞H2AK119二维基因化的结构和机制基础USP16
Huasong Ai1,2, Zaozhen He1, Zhiheng Deng1
1New Cornerstone Science Laboratory, Tsinghua-Peking Joint Center for Life Sciences, Ministry of Education Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Center for Synthetic and Systems Biology, Department of Chemistry, Tsinghua University, Beijing, China.
Nature structural & molecular biology
|June 25, 2024
概括
这项研究揭示了USP16如何从基因素H2AK119中去除乌比奎,这是一个关键的表观遗传标记. 这种deubiquitination机制与其他酶不同,为基因调节和疾病突变提供了洞察力.
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.
- 结构生物学 结构生物学
背景情况:
- 基因组的修饰,特别是基因组H2AK119单双化 (H2AK119Ub),是基因表达的关键表观遗传调节者.
- H2AK119Ub是转录抑制的标志,由Polycomb抑制综合体1 (PRC1) 和诸如USP16和PR-DUB综合体之类的二维基因酶动态控制.
研究的目的:
- 阐明单个子单元USP16酶识别和二基化H2AK119Ub核素的结构机制.
- 为了比较USP16的催化机制与多个子单位的PR-DUB复合体.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定USP16-H2AK119Ub核细胞组合物的结构.
主要成果:
- 冷-EM结构显示了USP16的独特核细胞识别模式,独立于H2A-H2B酸性补丁.
- 该结构还显示了在USP16介导的deubiquitination过程中,ubiquitin动机和素H2AC终端尾部的构造异质性.
- 与PR-DUB复合体相比,USP16采用了与PR-DUB复合体相比从根本上不同的脱化机制.
结论:
- 这项研究突出了H2AK119Ub deubiquitination中的机制多样性.
- 这些发现为了解USP16功能和与疾病相关的突变提供了结构基础.
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