Short RNA guides cleavage by eukaryotic RNase III.

Short RNA guides cleavage by eukaryotic RNase III.
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DOI:
10.1371/journal.pone.0000472
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发表时间:
2007-05-30
期刊:
影响因子:
3.7
通讯作者:
Abou Elela S
Abou Elela S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Lamontagne B;Abou Elela S

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在真核生物中,短RNA指导从RNA编辑到翻译抑制的各种酶活性。据推测,在进化过程中,预先存在的蛋白质进化为结合和使用向导RNA。然而,现代蛋白质采用新的RNA向导的能力从未得到证实。本研究表明,细菌dsrna特异性RNase III的酵母同源物Rnt1p可以结合短RNA转录物,并将其作为序列特异性切割的指南。靶标切割发生在距离Rnt1p结合位点恒定的距离上,使引导RNA完整地用于随后的切割。我们的研究结果表明,RNase III可以独立于RNAi机制触发序列特异性RNA降解,并为新一代不触发dsrna介导的免疫反应的精确RNA沉默工具开辟了道路。
In eukaryotes, short RNAs guide a variety of enzymatic activities that range from RNA editing to translation repression. It is hypothesized that pre-existing proteins evolved to bind and use guide RNA during evolution. However, the capacity of modern proteins to adopt new RNA guides has never been demonstrated. Here we show that Rnt1p, the yeast orthologue of the bacterial dsRNA-specific RNase III, can bind short RNA transcripts and use them as guides for sequence-specific cleavage. Target cleavage occurred at a constant distance from the Rnt1p binding site, leaving the guide RNA intact for subsequent cleavage. Our results indicate that RNase III may trigger sequence-specific RNA degradation independent of the RNAi machinery, and they open the road for a new generation of precise RNA silencing tools that do not trigger a dsRNA-mediated immune response.
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