Synergic interplay of the La motif, RRM1 and the interdomain linker of LARP6 in the recognition of collagen mRNA expands the RNA binding repertoire of the La module.

Synergic interplay of the La motif, RRM1 and the interdomain linker of LARP6 in the recognition of collagen mRNA expands the RNA binding repertoire of the La module.
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DOI:
10.1093/nar/gku1287
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发表时间:
2015-01
影响因子:
14.9
通讯作者:
Conte MR
Conte MR
中科院分区:
生物学2区
文献类型:
--
作者:
Martino L;Pennell S;Kelly G;Busi B;Brown P;Atkinson RA;Salisbury NJ;Ooi ZH;See KW;Smerdon SJ;Alfano C;Bui TT;Conte MR

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La 相关蛋白 (LARP) 形成一组不同的 RNA 结合蛋白,其特征是拥有复合 RNA 结合单元(La 模块)。 La 模块包含两个结构域:La 基序 (LaM) 和 RRM1,它们一起识别并结合多种 RNA 底物。目前,有关 La 模块的结构信息仅限于原型 La 蛋白,该蛋白充当与新生 RNA 聚合酶 III 转录物的 3' UUUOH 序列结合的 RNA 伴侣。相比之下,LARP6 参与胶原蛋白合成的调节,并与胶原蛋白 mRNA 5' UTR 内的特定茎环相互作用。在这里,我们展示了人类 LARP6 的 LaM 和 RRM1 的结构,在两种情况下都揭示了与 La 中的等效结构域相比相当大的结构变化,并揭示了 RRM1 前所未有的折叠。以这些结构为指导的诱变研究表明,RNA 识别需要 LaM 和 RRM1 之间的协同作用以及域间连接子的参与,这可能是为了实现底物选择性所需的串联域配置和动力学。我们的研究强调了 LARP 中 La 模块的架构具有相当大的复杂性和可塑性。
The La-related proteins (LARPs) form a diverse group of RNA-binding proteins characterized by the possession of a composite RNA binding unit, the La module. The La module comprises two domains, the La motif (LaM) and the RRM1, which together recognize and bind to a wide array of RNA substrates. Structural information regarding the La module is at present restricted to the prototypic La protein, which acts as an RNA chaperone binding to 3′ UUUOH sequences of nascent RNA polymerase III transcripts. In contrast, LARP6 is implicated in the regulation of collagen synthesis and interacts with a specific stem-loop within the 5′ UTR of the collagen mRNA. Here, we present the structure of the LaM and RRM1 of human LARP6 uncovering in both cases considerable structural variation in comparison to the equivalent domains in La and revealing an unprecedented fold for the RRM1. A mutagenic study guided by the structures revealed that RNA recognition requires synergy between the LaM and RRM1 as well as the participation of the interdomain linker, probably in realizing tandem domain configurations and dynamics required for substrate selectivity. Our study highlights a considerable complexity and plasticity in the architecture of the La module within LARPs.
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