TRBP ensures efficient Dicer processing of precursor microRNA in RNA-crowded environments.

TRBP ensures efficient Dicer processing of precursor microRNA in RNA-crowded environments.
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TRBP确保在RNA拥挤的环境中对前体microRNA的有效培训。

DOI:
10.1038/ncomms13694
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发表时间:
2016-12-09
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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RNA结合蛋白TRBP是DICER复合体的中心成分。尽管进行了十年的生化和结构研究,但TRBP在microRNA(MiRNA)生物发生中的基本功能仍不清楚。在这里,我们证明了TRBP是在RNA拥挤的环境中进行时效性DICER处理的一个积分辅因子。我们与大量细胞RNA物种竞争Dier对前miRNA的处理,发现Dier-TRBP,但不仅仅是Dier,仍然具有弹性。为了理解这种底物选择性的机制,我们使用了单分子荧光。实时观察显示,TRBP起到了守门人的作用,阻止了Dester与前miRNA样底物接触。TRBP利用DICER的PAZ结构域获得选择性,而DICER调节TRBP的RNA结合亲和力以实现快速周转。TRBP和DICER之间的这种协调作用实现了一种有效的丢弃前miRNA样底物的方式。RNA结合蛋白TRBP是Dice复合体的一个组成部分,但它在microRNA生物发生中的作用尚不清楚。在这里,作者使用拥挤的RNA环境和单分子成像来表明TRBP充当门卫,防止DICER与前miRNA样底物结合。
The RNA-binding protein TRBP is a central component of the Dicer complex. Despite a decade of biochemical and structural studies, the essential functionality of TRBP in microRNA (miRNA) biogenesis remains unknown. Here we show that TRBP is an integral cofactor for time-efficient Dicer processing in RNA-crowded environments. We competed for Dicer processing of pre-miRNA with a large amount of cellular RNA species and found that Dicer-TRBP, but not Dicer alone, remains resilient. To apprehend the mechanism of this substrate selectivity, we use single-molecule fluorescence. The real-time observation reveals that TRBP acts as a gatekeeper, precluding Dicer from engaging with pre-miRNA-like substrates. TRBP acquires the selectivity using the PAZ domain of Dicer, whereas Dicer moderates the RNA-binding affinity of TRBP for fast turnover. This coordinated action between TRBP and Dicer accomplishes an efficient way of discarding pre-miRNA-like substrates. The RNA binding protein TRBP is a component of the Dicer complex but its role in microRNA biogenesis remains poorly understood. Here the authors use a crowded RNA environment and single-molecule imaging to show that TRBP acts as a gatekeeper to prevent Dicer engagement with pre miRNA-like substrates.
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发表时间: 2016-08-01
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