An Argonaute transports siRNAs from the cytoplasm to the nucleus.

An Argonaute transports siRNAs from the cytoplasm to the nucleus.
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DOI:
10.1126/science.1157647
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发表时间:
2008-07-25
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Kennedy S
Kennedy S
中科院分区:
其他
文献类型:
--
作者:
Guang S;Bochner AF;Pavelec DM;Burkhart KB;Harding S;Lachowiec J;Kennedy S

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核糖核蛋白复合物由Argonaute样蛋白和小的调节RNA组成,在广泛的生物过程中发挥作用。这些小的调控RNA中的许多被预测至少部分地在细胞核内起作用。我们进行了一个遗传筛选,以确定必要的因素RNAi细胞核中的C。并鉴定了Argonaute蛋白NRDE-3。在不存在siRNA的情况下,NRDE-3存在于细胞质中。NRDE-3结合由RNA依赖性RNA聚合酶作用于细胞质中的mRNA模板产生的siRNA,并重新分布到细胞核。NRDE-3的核再分布需要功能性核定位信号,这是核RNAi所必需的,并导致NRDE-3与核定位的新生转录物相关联。因此,特定的Argonaute蛋白可以将特定类别的小调控RNA转运到不同的细胞区室以调控基因表达。
Ribonucleoprotein complexes consisting of Argonaute-like proteins and small regulatory RNAs function in a wide range of biological processes. Many of these small regulatory RNAs are predicted to act, at least in part, within the nucleus. We conducted a genetic screen to identify factors essential for RNAi in nuclei of C. elegans and identified the Argonaute protein NRDE-3. In the absence of siRNAs NRDE-3 resides in the cytoplasm. NRDE-3 binds siRNAs generated by RNA-dependent RNA Polymerases acting upon mRNA templates in the cytoplasm and redistributes to the nucleus. Nuclear redistribution of NRDE-3 requires a functional nuclear localization signal, is required for nuclear RNAi, and results in NRDE-3 association with nuclear-localized nascent transcripts. Thus, specific Argonaute proteins can transport specific classes of small regulatory RNAs to distinct cellular compartments to regulate gene expression.
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