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B56δ长期失调的手臂形成了一个动态的PP2A调节接口,加上全球性全ostery和乔丹综合征突变
Cheng-Guo Wu1,2, Vijaya K Balakrishnan1, Ronald A Merrill3
1McArdle Laboratory for Cancer Research, Department of Oncology, University of Wisconsin at Madison, School of Medicine and Public Health, Madison, WI 53705.
概括
编码为B56δ的PPP2R5D中的突变通过改变蛋白酸酶2A (PP2A) 全酶结构和活性,导致神经系统疾病. 这导致酶功能增加和细胞分裂错误.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 遗传学 是一个遗传学.
背景情况:
- 内在无序区域 (IDR) 和短线性动图 (SLiM) 在涉及激酶和酸酶的细胞信号通路中至关重要.
- B56δ (PPP2R5D) 是蛋白酸酶2A (PP2A) 的一个调控子单元,具有长IDR,SLiM和酸化位点的特征.
- 在PPP2R5D中发生的新突变与智力障碍,大脑症,帕金森症和其他神经疾病有关.
研究的目的:
- 阐明PP2R5D突变对PP2A-B56δ全酶的结构和功能后果.
- 了解PPP2R5D突变导致神经系统疾病的机制.
主要方法:
- 单粒子冷电子显微镜 (cryo-EM) 用于确定PP2A-B56δ全酶的结构.
- 生物化学测试以评估酶活性和酸化率.
- 分析突变对细胞过程 (如线粒分裂) 的影响.
主要成果:
- 冷-EM结构显示,B56δ的无序终端折叠形成一个双自抑制接口,稳定全酶在一个封闭的,潜伏状态.
- 这个跨越190 Å的接口包含不利的接触,酸化点和大多数受智力障碍相关突变影响的残留物.
- 发现PPP2R5D的突变会增加全酶活性,改变酸化动态,并且在严重的情况下,增加线粒细胞的持续时间和错误率.
结论:
- B56δ子单元的末端形成了一个动态的自抑制接口,对于调节PP2A全酶活性至关重要.
- 与神经系统疾病相关的突变破坏了这种接口,导致酶功能的改变,并可能导致疾病的发病.
- 这些发现提供了PP2A调节的结构基础和PP2R5D相关的神经发育障碍背后的分子机制的见解.
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