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Ago2/miRISC-mediated inhibition of CBP80/20-dependent translation and thereby abrogation of nonsense-mediated mRNA decay require the cap-associating activity of Ago2

Authors
Choe, JunhoCho, HanaChi, Sung-GilKim, Yoon Ki
Issue Date
2-9월-2011
Publisher
ELSEVIER SCIENCE BV
Keywords
Ago2; MicroRNA; NMD; CBP80/20; eIF4E
Citation
FEBS LETTERS, v.585, no.17, pp.2682 - 2687
Indexed
SCIE
SCOPUS
Journal Title
FEBS LETTERS
Volume
585
Number
17
Start Page
2682
End Page
2687
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/111602
DOI
10.1016/j.febslet.2011.07.047
ISSN
0014-5793
Abstract
Nuclear cap-binding protein (CBP) 80/20-dependent translation (CT) is one of the targets for miRNA-mediated gene silencing. Here, we provide evidence that human argonaute 2 (Ago2) competes with CBP80/20 for cap-association, inhibiting CT and thus nonsense-mediated mRNA decay (NMD), which is tightly coupled to CT. Tethering of Ago2, but not of Ago2F2V2 which lacks cap -association activity, to the 3'UTR of PTC-containing mRNA abrogates NMD. Immunoprecipitation using CBP80 antibody reveals that Ago2, but not Ago2F2V2, inhibits the binding of CBP80/20 to cap structure. Our observations provide molecular insight into the cross-talk between miRNA-mediated gene silencing, CT, and NMD. Structured summary of protein interactions: AGO2 physically interacts with GW182 by anti tag coimmunoprecipitation (View interaction) (C) 2011 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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