MicroRNAs inhibit the translation of target mRNAs on the endoplasmic reticulum in Arabidopsis.

MicroRNAs inhibit the translation of target mRNAs on the endoplasmic reticulum in Arabidopsis.
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DOI:
10.1016/j.cell.2013.04.005
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发表时间:
2013-04-25
期刊:
影响因子:
64.5
通讯作者:
Chen X
Chen X
中科院分区:
生物学1区
文献类型:
--
作者:
Li S;Liu L;Zhuang X;Yu Y;Liu X;Cui X;Ji L;Pan Z;Cao X;Mo B;Zhang F;Raikhel N;Jiang L;Chen X

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翻译抑制是植物和动物中微RNA的主要但知之甚少的作用模式。特别是,这个过程发生的亚细胞位置是未知的。在这里,我们表明,翻译抑制,而不是mRNA的切割活性的拟南芥miRNA需要改变分生组织程序1(AMP 1)。AMP1编码与内质网(ER)和ARGONAUTE1相关的整合膜蛋白,ARGONAUTE1是miRNA效应子和外周ER膜蛋白。在野生型和amp1突变体之间,对于膜结合的多聚核糖体,但不是总的多聚核糖体,发现miRNA靶RNA的多聚核糖体缔合存在很大差异。这与miRNA靶转录物向膜组分的AMP 1非依赖性募集一起表明miRNA抑制靶RNA在ER上的翻译。这项研究表明翻译抑制是植物miRNAs的一项重要活性,揭示了该活性的亚细胞位置,并揭示了ER以前未知的功能。
Translation inhibition is a major but poorly understood mode of action of micro(mi)RNAs in plants and animals. In particular, the subcellular location where this process takes place is unknown. Here we show that the translation inhibition but not the mRNA cleavage activity of Arabidopsis miRNAs requires ALTERED MERISTEM PROGRAM1 (AMP1). AMP1 encodes an integral membrane protein associated with endoplasmic reticulum (ER) and ARGONAUTE1, the miRNA effector and a peripheral ER membrane protein. Large differences in polysome association of miRNA target RNAs are found between wild type and the amp1 mutant for membrane-bound but not total polysomes. This, together with AMP1-independent recruitment of miRNA target transcripts to membrane fractions, shows that miRNAs inhibit the translation of target RNAs on the ER. This study demonstrates that translation inhibition is an important activity of plant miRNAs, reveals the subcellular location of this activity, and uncovers a previously unknown function of the ER.
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