ASXL1 K351单双化的独特粘合效应刺激了PR-DUB活动
Tianyi Zhang1,2, Jiqing Zheng1, Zebing Tong1
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 chemical biology
|January 9, 2026
概括
ASXL1的单双化作为一个分子剂,稳定了Polycomb抑制双化酶 (PR-DUB) 复合体. 这种远端修饰通过增加关键生物调节的催化速度来增强酶活性.
科学领域:
- 生物化学 生物化学
- 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.
背景情况:
- 蛋白质无化通过蛋白质溶解和非蛋白质溶解途径调节生物过程.
- 在酶活性调节中的ubiquitination的作用通常仅限于酶基质接口.
研究的目的:
- 为了研究一种由ubiquitination介导的酶激活的新机制.
- 阐明ASXL1单双基因化如何调节聚合物抑制双基因化酶 (PR-DUB) 复合体.
主要方法:
- 针对位点的突变发生和生物化学测试,以评估PR-DUB的活性.
- 结构生物学技术,包括X射线结晶学或冷EM,以确定作用机制.
- 分子动力学模拟和-交换质谱 (HDX-MS) 用于分析形状变化.
主要成果:
- ASXL1 K351单双化激活PR-DUB通过稳定其催化口袋,增加Vmax而不会改变Km.
- 乌比基作为一个分子,桥梁ASXL1和BAP1子单元和限制PR-DUB动态.
- 这种修改将PR-DUB锁定在一个有效的基板加工的活性构造中.
结论:
- 一个独特的远端无处不在机制通过跨子单位稳定激活PR-DUB.
- ASXL1单基化为基介导的酶调节提供了一个新的范式.
- 这些发现澄清了PR-DUB的激活机制,并揭示了乌比奎作为分子的新角色.
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