Slicing-independent RISC activation requires the argonaute PAZ domain.
Slicing-independent RISC activation requires the argonaute PAZ domain.
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DOI:
10.1016/j.cub.2012.06.040
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发表时间:
2012-08-21
期刊:
影响因子:
9.2
通讯作者:
Kay, Mark A.
中科院分区:
文献类型:
--
作者:
Gu, Shuo;Jin, Lan;Huang, Yong;Zhang, Feijie;Kay, Mark A.
Small RNAs regulate genetic networks through a ribonucleo-protein complex called the RNA-induced silencing complex (RISC), which, in mammals, contains at its center one of four Argonaute proteins (Ago1–Ago4) (reviewed in). A key regulatory event in the RNA interference (RNAi) and microRNA (miRNA) pathways is Ago loading, wherein double-stranded small-RNA duplexes are incorporated into RISC (pre-RISC) and then become single-stranded (mature RISC), a process that is not well understood. The Agos contain an evolutionarily conserved PAZ (Piwi/Argonaute/Zwille) domain whose primary function is to bind the 3′ end of small RNAs. We created multiple PAZ-domain-disrupted mutant Ago proteins and studied their biochemical properties and biological functionality in cells. We found that the PAZ domain is dispensable for Ago loading of slicing-competent RISC. In contrast, in the absence of slicer activity or slicer-substrate duplex RNAs, PAZ-disrupted Agos bound duplex small interfering RNAs, but were unable to unwind or eject the passenger strand and form functional RISC complexes. We have discovered that the highly conserved PAZ domain plays an important role in RISC activation, providing new mechanistic insights into how miRNAs regulate genes, as well as new insights for future design of miRNA- and RNAi-based therapeutics.
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DOI:
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发表时间:
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期刊:
NATURE STRUCTURAL BIOLOGY
影响因子:
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发表时间:
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