ADAR1 forms a complex with Dicer to promote microRNA processing and RNA-induced gene silencing.

ADAR1 forms a complex with Dicer to promote microRNA processing and RNA-induced gene silencing.
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DOI:
10.1016/j.cell.2013.03.024
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发表时间:
2013-04-25
期刊:
影响因子:
64.5
通讯作者:
Nishikura K
Nishikura K
中科院分区:
生物学1区
文献类型:
--
作者:
Ota H;Sakurai M;Gupta R;Valente L;Wulff BE;Ariyoshi K;Iizasa H;Davuluri RV;Nishikura K

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作用于RNA的腺苷脱氨酶(ADARs)参与RNA编辑,将双链RNA中的腺苷残基特异性地转化为肌苷。在本研究中,我们研究了RNA编辑机制与RNA干扰(RNAi)机制的相互作用,发现ADAR1通过直接的蛋白-蛋白相互作用与Dicer形成复合物。最重要的是,ADAR1增加了Dicer切割前microrna (miRNA)的最大速率(Vmax),并促进了miRNA装载到rna诱导的沉默复合物上,从而确定了ADAR1在miRNA加工和RNAi机制中的新作用。ADAR1分别通过形成ADAR1/ADAR1同型二聚体或Dicer/ADAR1异源二聚体复合物来区分其在RNA编辑和RNAi中的功能。正如预期的那样,在ADAR1−/−小鼠胚胎中,mirna的表达被全面抑制,这反过来改变了它们的靶基因的表达,并可能导致它们的胚胎致死表型。
Adenosine deaminases acting on RNA (ADARs) are involved in RNA editing that converts adenosine residues to inosine specifically in double-stranded RNAs. In this study, we investigated the interaction of the RNA editing mechanism with the RNA interference (RNAi) machinery and found that ADAR1 forms a complex with Dicer through direct protein-protein interaction. Most importantly, ADAR1 increases the maximum rate (Vmax) of pre-microRNA (miRNA) cleavage by Dicer and facilitates loading of miRNA onto RNA-induced silencing complexes, identifying a new role of ADAR1 in miRNA processing and RNAi mechanisms. ADAR1 differentiates its functions in RNA editing and RNAi by formation of either ADAR1/ADAR1 homodimer or Dicer/ADAR1 heterodimer complexes, respectively. As expected, expression of miRNAs is globally inhibited in ADAR1−/− mouse embryos, which in turn alters expression of their target genes and might contribute to their embryonic lethal phenotype.
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