细胞EJC互动组揭示了更高阶的mRNP结构和一个EJC-SR蛋白质连接
Guramrit Singh1, Alper Kucukural1, Can Cenik1
1Howard Hughes Medical Institute, University of Massachusetts Medical School, Worcester, MA 01605; Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605.
Cell
|October 23, 2012
概括
异子结合复合体 (EJC) 和SR蛋白在拼接的mRNA上形成大型复合体,影响mRNA包装. 这项研究揭示了EJC在人体细胞中的新型相互作用和功能.
科学领域:
- 分子生物学分子生物学
- 在RNA生物学,RNA生物学.
- 基因表达 基因表达
背景情况:
- 前mRNA拼接塑造了真核体的转录,并影响了信使核糖蛋白 (mRNP) 的组成.
- 外因子结合复合体 (EJC) 沉积在外因子-外因子结合点上的拼接mRNA上,是mRNP的关键组成部分.
研究的目的:
- 为了全面分析内源性人类EJC蛋白和RNA相互作用体.
- 调查体内占用率和EJC的相互作用.
主要方法:
- 对内源人类EJC蛋白和RNA相互作用体的分析.
- 确认EJC占用地点和在外结处的流行情况.
主要成果:
- 证实了正规的EJC位置是24个核酸在外因子结的上游,大多数外因子结都携带了EJC.
- 内源EJC相互多元化以及与众多SR蛋白质多元化,形成大型复合体.
- 在这些复合体内,SR蛋白对EJC核心因子具有超静态度.
结论:
- EJCs和SR蛋白之间的物理关联可能解释了它们的功能平行.
- EJCs和SR蛋白合作保护mRNA免受核酶消化,促进mRNA包装和紧缩.
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