3' splice site recognition in nematode trans-splicing involves enhancer-dependent recruitment of U2 snRNP.

3' splice site recognition in nematode trans-splicing involves enhancer-dependent recruitment of U2 snRNP.
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线虫转拼中的 3 剪接位点识别涉及 U2 snRNP 的增强子依赖性募集。

DOI:
10.1017/s1355838201010263
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发表时间:
2001
期刊:
RNA (New York, N.Y.)
影响因子:
--
通讯作者:
Nilsen,TW
Nilsen,TW
中科院分区:
--
文献类型:
--
作者:
Romfo,CM;Maroney,PA;Wu,S;Nilsen,TW

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反式剪接需要5′和3′剪接位点被独立识别。在此,我们使用突变分析和灵敏的核酸酶保护试验来确定体外反式-3 ′剪接位点识别的机制。3′剪接位点的有效识别依赖于3′剪接位点本身的序列和位于3′外显子中的增强子元件。我们发现,三种不同类型的增强子的存在下,结果在增加U2 snRNP的分支点区域的结合。几条证据有力地表明,U2 snRNP的结合增加是由U2 AF介导的。这些结果扩展了增强子在组成性剪接中的作用,并为增强子功能的募集模型提供了直接支持。
Trans-splicing requires that 5′ and 3′ splice sites be independently recognized. Here, we have used mutational analyses and a sensitive nuclease protection assay to determine the mechanism of trans-3′ splice site recognition in vitro. Efficient recognition of the 3′ splice site is dependent upon both the sequence of the 3′ splice site itself and enhancer elements located in the 3′ exon. We show that the presence of three distinct classes of enhancers results in increased binding of U2 snRNP to the branchpoint region. Several lines of evidence strongly suggest that the increased binding of U2 snRNP is mediated by U2AF. These results expand the roles of enhancers in constitutive splicing and provide direct support for the recruitment model of enhancer function.
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DOI: --
发表时间: 1995
期刊: RNA (New York, N.Y.)
影响因子: --
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