该Rbfox1/LASR复合体通过识别多部分RNA调节模块来控制替代的mRNA前剪接
bioRxiv : the preprint server for biology
|July 29, 2024
概括
Rbfox/LASR复合体使用多种动机结合RNA,而不仅仅是GCAUG. 这揭示了蛋白质复合体如何通过协同RNA元素解码组合拼接信号.
科学领域:
- 分子生物学分子生物学
- 在RNA生物学,RNA生物学.
- 基因法规 基因法规
背景情况:
- Rbfox 蛋白质是替代性 mRNA 前剪接的关键调节者,与 GCAUG RNA 基因结合.
- 在核中,Rbfox与LASR复合体结合,该复合体识别额外的RNA动机.
- 在RNA结合和拼接调节中的Rbfox/LASR复杂合作的精确机制尚未完全理解.
研究的目的:
- 为了映射Rbfox1/LASR复合体的转录组范围RNA结合位.
- 阐明Rbfox/LASR复合体的不同子单元如何对RNA识别和拼接调节作出贡献.
- 了解Rbfox/LASR复合体识别的RNA基因的组合性.
主要方法:
- 核酶保护试验用于确定新生RNA上的Rbfox1/LASR足迹.
- 对突变Rbfox1 ((F125A) 的分析,以区分Rbfox1和LASR亚单元的结合部位.
- 拼接试验和迷你基因实验,以评估对目标外基因的调节效应.
主要成果:
- Rbfox1/LASR结合含有GCAUG动机的RNA以及LASR子单元 (hnRNP M,H/F,C,Matrin3) 的动机.
- 这些RNA基因经常被同时发现,形成多部分调节模块.
- 一种突变的Rbfox1 ((F125A) 保留了LASR亚单元的结合,但失去了GCAUG的相互作用,证实了不同的结合特异性.
- 通过GCAUG和LASR子单元相关的动机,Rbfox有助于剪接激活.
- 多种串联RNA元素对目标外基因产生联合调节效应.
结论:
- Rbfox/LASR复合体识别了比以前更广泛的RNA基因,包括LASR子单元的基因.
- 配对RNA基因的排列使该复合体能够解码组合拼接调节信号.
- 这项研究提供了关于RNA结合蛋白质复合体微调替代拼接的复杂机制的见解.
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