Mammalian miRNA RISC recruits CAF1 and PABP to affect PABP-dependent deadenylation.
Mammalian miRNA RISC recruits CAF1 and PABP to affect PABP-dependent deadenylation.
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DOI:
10.1016/j.molcel.2009.08.004
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发表时间:
2009-09-24
期刊:
影响因子:
16
通讯作者:
Sonenberg, Nahum
中科院分区:
文献类型:
--
作者:
Fabian, Marc R.;Mathonnet, Geraldine;Sundermeier, Thomas;Mathys, Hansruedi;Zipprich, Jakob T.;Svitkin, Yuri V.;Rivas, Fabiola;Jinek, Martin;Wohischlegel, James;Doudna, Jennifer A.;Chen, Chyi-Ying A.;Shyu, Ann-Bin;Yates, John R., III;Hannon, Gregory J.;Filipowicz, Witold;Duchaine, Thomas F.;Sonenberg, Nahum
MicroRNAs (miRNAs) inhibit mRNA expression in general by base pairing to the 3′UTR of target mRNAs and consequently inhibiting translation and/or initiating poly(A) tail deadenylation and mRNA destabilization. Here we examine the mechanism and kinetics of miRNA-mediated deadenylation in mouse Krebs-2 ascites extract. We demonstrate that miRNA-mediated mRNA deadenylation occurs subsequent to initial translational inhibition, indicating a two-step mechanism of miRNA action, which serves to consolidate repression. We show that a let-7 miRNA-loaded RNA-induced silencing complex (miRISC) interacts with the poly(A)-binding protein (PABP) and the CAF1 and CCR4 deadenylases. In addition, we demonstrate that miRNA-mediated deadenylation is dependent upon CAF1 activity and PABP, which serves as a bona fide miRNA coactivator. Importantly, we present evidence that GW182, a core component of the miRISC, directly interacts with PABP via its C-terminal region and that this interaction is required for miRNA-mediated deadenylation.
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