特定的催化受损的DDX3X突变物形成性二态的空洞凝聚物
Michael C Owens1,2, Hui Shen1,3, Amber Yanas1,2
1Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA.
Nature communications
|November 5, 2024
概括
突变RNA螺旋酶DDX3X形成异常凝聚物,损害其在癌症和发育障碍中的功能. 野生型DDX3X与DDX3Y不同,与这些突变物相互作用,可能解释疾病的性别偏差.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 遗传学 是一个遗传学.
背景情况:
- RNA螺旋酶DDX3X的突变与癌症和神经发育障碍有关.
- DDX3X功能障碍的确切机制以及与其同类物 (DDX3X和DDX3Y) 的相互作用尚未完全理解.
研究的目的:
- 研究与疾病相关的DDX3X突变对其结构,功能和相互作用的影响.
- 阐明DDX3X突变体在凝结物形成和蛋白质结合中的作用.
- 探索野生类型DDX3X和DDX3Y对突变DDX3X行为的差异性影响.
主要方法:
- 使用了结构,生化和单分子显微镜技术.
- 用蛋白质组分析来识别被隔离的蛋白质.
- 进行了细胞测试,以研究凝结物形成和动态.
主要成果:
- 特定的DDX3X突变物形成明显的空心凝聚物,与ATPase和RNA释放活动的减少有关.
- 这些凝结物在多个步骤中抑制了DDX3X催化循环.
- 空腔凝聚物隔离野生型DDX3X/DDX3Y和其他信号蛋白.
- 与DDX3Y相比,野生型DDX3X更有效地增强了突变型/野生型凝聚物的动态.
结论:
- 与疾病相关的DDX3X突变导致催化缺陷和异常的凝结物形成.
- 这些凝结物扣留了必需的蛋白质,破坏了细胞信号传输.
- 突变DDX3X及其野生类型同类物之间的差异性相互作用可能是性别偏差疾病患病率的基础.
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