YB-1 binds to CAUC motifs and stimulates exon inclusion by enhancing the recruitment of U2AF to weak polypyrimidine tracts.

YB-1 binds to CAUC motifs and stimulates exon inclusion by enhancing the recruitment of U2AF to weak polypyrimidine tracts.
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YB-1 与 CAUC 基序结合,并通过增强 U2AF 向弱聚嘧啶束的募集来刺激外显子包含

DOI:
10.1093/nar/gks579
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发表时间:
2012-09-01
影响因子:
14.9
通讯作者:
Hui J
Hui J
中科院分区:
生物学2区
文献类型:
--
作者:
Wei WJ;Mu SR;Heiner M;Fu X;Cao LJ;Gong XF;Bindereif A;Hui J

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人Y盒结合蛋白-1(YB-1)是一种具有多效性功能的脱氧核糖核酸(DNA)/核糖核酸(RNA)结合蛋白。除了在转录和翻译调控中的作用外,最近的一些研究表明YB-1是剪接体相关蛋白,并参与选择性剪接,但其潜在的机制仍不清楚。在这里,我们将CAUC和CACC定义为YB-1的高亲和力结合基序,通过指数富集配体的系统进化(SELEX),并证明这些新定义的基序作为剪接增强子。有趣的是,在内源性CD 44基因上,YB-1似乎介导了一种网络相互作用,通过选择性外显子及其上游多聚嘧啶段中的多个CAUC基序激活外显子v5包含。我们提供的证据表明,YB-1激活剪接促进招聘U2 AF 65弱聚嘧啶束通过直接的蛋白质-蛋白质相互作用。总之,这些发现表明YB-1在激活哺乳动物细胞中弱3′剪接位点的子集中起着至关重要的作用。
The human Y box-binding protein-1 (YB-1) is a deoxyribonucleic acid (DNA)/ribonucleic acid (RNA)-binding protein with pleiotropic functions. Besides its roles in the regulation of transcription and translation, several recent studies indicate that YB-1 is a spliceosome-associated protein and is involved in alternative splicing, but the underlying mechanism has remained elusive. Here, we define both CAUC and CACC as high-affinity binding motifs for YB-1 by systematic evolution of ligands by exponential enrichment (SELEX) and demonstrate that these newly defined motifs function as splicing enhancers. Interestingly, on the endogenous CD44 gene, YB-1 appears to mediate a network interaction to activate exon v5 inclusion via multiple CAUC motifs in both the alternative exon and its upstream polypyrimidine tract. We provide evidence that YB-1 activates splicing by facilitating the recruitment of U2AF65 to weak polypyrimidine tracts through direct protein–protein interactions. Together, these findings suggest a vital role of YB-1 in activating a subset of weak 3′ splice sites in mammalian cells.
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作者:
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DOI: 10.1261/rna.5660803
发表时间: 2003-08-01
期刊: RNA
影响因子: 4.5
作者:
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通讯作者: Bindereif, A