Mammalian hyperplastic discs homolog EDD regulates miRNA-mediated gene silencing.

Mammalian hyperplastic discs homolog EDD regulates miRNA-mediated gene silencing.
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DOI:
10.1016/j.molcel.2011.06.013
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发表时间:
2011-07-08
期刊:
影响因子:
16
通讯作者:
Wang X
Wang X
中科院分区:
生物学1区
文献类型:
--
作者:
Su H;Meng S;Lu Y;Trombly MI;Chen J;Lin C;Turk A;Wang X

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microRNA(miRNAs)通过翻译抑制和mRNA去稳定化来调节基因表达。然而,miRNA沉默的分子机制仍然没有得到很好的定义。利用小鼠胚胎干(ES)细胞中的遗传筛选,我们确定了哺乳动物增生盘蛋白EDD,一种已知的E3泛素连接酶,作为miRNA沉默途径的关键组成部分。EDD缺陷的ES细胞在miRNA功能上有缺陷,并表现出生长缺陷。我们证明了E3泛素连接酶的活性与EDD在miRNA沉默中的功能无关。相反,EDD与Argonaute-miRNA复合物中的GW 182家族蛋白相互作用。EDD的PABC结构域对于其沉默功能是必不可少的。通过PABC结构域,EDD通过募集下游效应子参与miRNA沉默。在PABC相互作用子中,DDX 6和Tob 1/2都是沉默mRNA靶点所必需的并且是足够的。总之,这些数据证明了EDD在miRNA沉默中的关键功能。
MicroRNAs (miRNAs) regulate gene expression through translation repression and mRNA destabilization. However, the molecular mechanisms of miRNA silencing are still not well defined. Using a genetic screen in mouse embryonic stem (ES) cells, we identify mammalian hyperplastic discs protein EDD, a known E3 ubiquitin ligase, as a key component of the miRNA silencing pathway. ES cells deficient for EDD are defective in miRNA function and exhibit growth defects. We demonstrate that E3 ubiquitin ligase activity is dispensable for EDD function in miRNA silencing. Instead, EDD interacts with GW182 family proteins in the Argonaute-miRNA complexes. The PABC domain of EDD is essential for its silencing function. Through the PABC domain, EDD participates in miRNA silencing by recruiting downstream effectors. Among the PABC-interactors, DDX6 and Tob1/2 are both required and sufficient for silencing mRNA targets. Taken together, these data demonstrate a critical function for EDD in miRNA silencing.
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