Akt-mediated phosphorylation of argonaute 2 downregulates cleavage and upregulates translational repression of MicroRNA targets.

Akt-mediated phosphorylation of argonaute 2 downregulates cleavage and upregulates translational repression of MicroRNA targets.
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DOI:
10.1016/j.molcel.2013.03.015
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发表时间:
2013-05-09
期刊:
影响因子:
16
通讯作者:
Orth, Anthony P.
Orth, Anthony P.
中科院分区:
生物学1区
文献类型:
--
作者:
Horman, Shane R.;Janas, Maja M.;Litterst, Claudia;Wang, Bingbing;MacRae, Ian J.;Sever, Mary J.;Morrissey, David V.;Graves, Paul;Luo, Biao;Umesalma, Shaikamjad;Qi, Hank H.;Miraglia, Loren J.;Novina, Carl D.;Orth, Anthony P.

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使用靶向人激酶组的542个基因的高通量RNA干扰(RNAi)筛选来发现RNAi的调节剂。在这里,我们报告了原癌基因Akt-3/PKBγ(Akt 3)磷酸化Argonaute 2(Ago 2)的Ser 387,下调切割和上调内源性microRNA(miRNA)靶向mRNA的翻译抑制。我们进一步证明Akt 3与Ago 2共免疫沉淀,并且Ago 2在Ser 387处的磷酸化促进其与GW 182的相互作用和定位于细胞质P体,其中认为miRNA靶向的mRNA被储存和降解。因此,Akt 3介导的Ago 2磷酸化是Ago 2的靶mRNA切割和翻译抑制活性之间的分子开关。
A high-throughput RNA interference (RNAi) screen targeting 542 genes of the human kinome was used to discover regulators of RNAi. Here we report that the proto-oncogene Akt-3/PKBγ (Akt3) phosphorylates Argonaute 2 (Ago2) at Ser387 which down-regulates cleavage and up-regulates translational repression of endogenous microRNA (miRNA)-targeted mRNAs. We further demonstrate that Akt3 co-immunoprecipitates with Ago2 and that phosphorylation of Ago2 at Ser387 facilitates its interaction with GW182 and localization to cytoplasmic P-bodies, where miRNA-targeted mRNAs are thought to be stored and degraded. Therefore, Akt3-mediated phosphorylation of Ago2 is a molecular switch between target mRNA cleavage and translational repression activities of Ago2.
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