Human Argonaute2 and Argonaute3 are catalytically activated by different lengths of guide RNA.

Human Argonaute2 and Argonaute3 are catalytically activated by different lengths of guide RNA.
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人Argonaute2和Argonaute3被不同长度的引导RNA催化激活。

DOI:
10.1073/pnas.2015026117
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发表时间:
2020-11-17
影响因子:
11.1
通讯作者:
Nakanishi K
Nakanishi K
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Park MS;Sim G;Kehling AC;Nakanishi K

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RNA干扰是一种真核生物特异性的基因沉默,通过20 ~ 23个核苷酸(nt)的microRNA和小干扰RNA将Argonaute蛋白募集到互补RNA中进行降解。在人类中,Argonaute 2(AGO 2)被认为是唯一的切割器,而Argonaute 3(AGO 3)几乎不切割RNA。因此,AGO 3的内在切片活性仍然存在争议,并且是一个长期存在的问题。在这里,我们报告了let-7a,miR-27 a和特定miR-17-92家族的14-nt 3′端缩短变体,这些变体使AGO 3成为一种非常有能力的切割器,在某些情况下将靶切割增加至1082倍。这些被称为切割诱导微小向导RNA(cityRNA)的RNA相反地降低了AGO 2的活性,表明AGO 2和AGO 3具有不同的用于靶切割的最佳向导长度。我们的研究揭示了微小指导RNA的作用。
RNA interfering is a eukaryote-specific gene silencing by 20∼23-nucleotide (nt) microRNAs and small interfering RNAs that recruit Argonaute proteins to complementary RNAs for degradation. In humans, Argonaute2 (AGO2) has been known as the only slicer while Argonaute3 (AGO3) barely cleaves RNAs. Therefore, the intrinsic slicing activity of AGO3 remains controversial and a long-standing question. Here, we report 14-nt 3′ end-shortened variants of let-7a, miR-27a, and specific miR-17–92 families that make AGO3 an extremely competent slicer, increasing target cleavage up to ∼82-fold in some instances. These RNAs, named cleavage-inducing tiny guide RNAs (cityRNAs), conversely lower the activity of AGO2, demonstrating that AGO2 and AGO3 have different optimum guide lengths for target cleavage. Our study sheds light on the role of tiny guide RNAs.
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