通过Rbfox的拼接激活需要通过其氨酸丰富的域进行自我聚合
Yi Ying1, Xiao-Jun Wang2, Celine K Vuong1
1Molecular Biology Interdepartmental Doctoral Program, University of California, Los Angeles, Los Angeles, CA, USA; Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA, USA.
Cell
|July 15, 2017
概括
Rbfox蛋白通过它们的C端域与大型拼接调节器组合 (LASR). 这种高阶组合对于正常的RNA拼接至关重要,与病态蛋白质聚合物不同.
科学领域:
- 分子生物学
- 细胞生物学
- 生物化学
背景情况:
- Rbfox家族的蛋白质是替代拼接的关键调节者.
- Rbfox蛋白在一个更大的复合体中起作用,称为大拼接调节器组 (LASR).
研究的目的:
- 研究Rbfox蛋白与LASR复合体之间的相互作用.
- 确定Rbfox C终端域 (CTD) 在拼接调节和复杂组装中的作用.
- 探索RbfoxCTD的生物物理特性及其功能意义.
主要方法:
- 共同免疫沉试验用于研究蛋白质相互作用.
- 在体外聚合测试以分析RbfoxCTD的自组合特性.
- 剪接试验,以评估CTD组件对RNA剪接的功能影响.
主要成果:
- Rbfox蛋白通过其CTD与LASR相互作用,这对于拼接活动至关重要.
- 在Rbfox CTD中,一个含有重复氨酸的低复杂性 (LC) 序列介于高阶Rbfox/LASR组合.
- 这种LC序列在溶液中经历自发的纤维聚合和水凝形成.
- 需要Rbfox CTD组件来启动拼接,并影响其他拼接决策.
- 与病态聚合物不同,Rbfox CTD组件是其正常功能中的组成部分.
结论:
- 通过其CTD介导的Rbfox蛋白的高阶组合是调节替代拼接的关键机制.
- 这种组装过程与神经退行性疾病中出现的病态蛋白质聚合不同.
- 核高阶拼接调节器,而不仅仅是个体招募,决定了替代拼接结果.
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