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• W2077584262 abstract "miRNAs silence their complementary target mRNAs by translational repression as well as by poly(A) shortening and mRNA decay. In Drosophila, miRNAs are typically incorporated into Argonaute1 (Ago1) to form the effector complex called RNA-induced silencing complex (RISC). Ago1-RISC associates with a scaffold protein GW182, which recruits additional silencing factors. We have previously shown that miRNAs repress translation initiation by blocking formation of the 48S and 80S ribosomal complexes. However, it remains unclear how ribosome recruitment is impeded. Here, we examined the assembly of translation initiation factors on the target mRNA under repression. We show that Ago1-RISC induces dissociation of eIF4A, a DEAD-box RNA helicase, from the target mRNA without affecting 5' cap recognition by eIF4E in a manner independent of GW182. In contrast, direct tethering of GW182 promotes dissociation of both eIF4E and eIF4A. We propose that miRNAs act to block the assembly of the eIF4F complex during translation initiation." @default.
• W2077584262 created "2016-06-24" @default.
• W2077584262 creator A5025964973 @default.
• W2077584262 creator A5050243337 @default.
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• W2077584262 date "2014-10-01" @default.
• W2077584262 modified "2023-10-13" @default.
• W2077584262 title "MicroRNAs Block Assembly of eIF4F Translation Initiation Complex in Drosophila" @default.
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• W2077584262 doi "https://doi.org/10.1016/j.molcel.2014.09.004" @default.
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