Structural insights into the targeting of mRNA GU-rich elements by the three RRMs of CELF1.

Structural insights into the targeting of mRNA GU-rich elements by the three RRMs of CELF1.
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DOI:
10.1093/nar/gkt470
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发表时间:
2013-08
影响因子:
14.9
通讯作者:
Searle MS
Searle MS
中科院分区:
生物学2区
文献类型:
--
作者:
Edwards JM;Long J;de Moor CH;Emsley J;Searle MS

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CUG-BP, elav样家族(CELF)的rna结合蛋白通过调控pre-mRNA剪接、deadenylation和mRNA稳定性,在多个不同水平上控制基因表达。我们对CELF成员1 (CELF1)对一般形式为5 ' -UGUNxUGUNyUGU的富含gu的mRNA靶序列的结合选择性进行了结构上的深入研究,并发现了一个高亲和相互作用(Kd ~ 100 nM, x = 2和y = 4),在一个15-nt结合元件内同时结合所有三个RNA识别基序。在3′或5′端进行自旋标记的RNA底物会导致不同的核磁共振顺磁弛豫增强效应,这与UGU位点上三个RNA识别基序沿RNA靶标沿5′至3′方向的非顺序2-1-3排列一致。我们进一步证明,CELF1结合到RNA发夹基部分散的单链UGU位点上,为识别CUG扩展重复和剪接位点连接提供了结构原理,从而调节了选择性剪接。
The CUG-BP, Elav-like family (CELF) of RNA-binding proteins control gene expression at a number of different levels by regulating pre-mRNA splicing, deadenylation and mRNA stability. We present structural insights into the binding selectivity of CELF member 1 (CELF1) for GU-rich mRNA target sequences of the general form 5′-UGUNxUGUNyUGU and identify a high affinity interaction (Kd ∼ 100 nM for x = 2 and y = 4) with simultaneous binding of all three RNA recognition motifs within a single 15-nt binding element. RNA substrates spin-labelled at either the 3′ or 5′ terminus result in differential nuclear magnetic resonance paramagnetic relaxation enhancement effects, which are consistent with a non-sequential 2-1-3 arrangement of the three RNA recognition motifs on UGU sites in a 5′ to 3′ orientation along the RNA target. We further demonstrate that CELF1 binds to dispersed single-stranded UGU sites at the base of an RNA hairpin providing a structural rationale for recognition of CUG expansion repeats and splice site junctions in the regulation of alternative splicing.
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