Abstract:
:The control of messenger RNA (mRNA) function by micro RNAs (miRNAs) in animal cells requires the GW182 protein. GW182 is recruited to the miRNA repression complex via interaction with Argonaute protein, and functions downstream to repress protein synthesis. Interaction with Argonaute is mediated by GW/WG repeats, which are conserved in many Argonaute-binding proteins involved in RNA interference and miRNA silencing, from fission yeast to mammals. GW182 contains at least three effector domains that function to repress target mRNA. Here, we analyze the functions of the N-terminal GW182 domain in repression and Argonaute1 binding, using tethering and immunoprecipitation assays in Drosophila cultured cells. We demonstrate that its function in repression requires intact GW/WG repeats, but does not involve interaction with the Argonaute1 protein, and is independent of the mRNA polyadenylation status. These results demonstrate a novel role for the GW/WG repeats as effector motifs in miRNA-mediated repression.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Chekulaeva M,Parker R,Filipowicz Wdoi
10.1093/nar/gkq501subject
Has Abstractpub_date
2010-10-01 00:00:00pages
6673-83issue
19eissn
0305-1048issn
1362-4962pii
gkq501journal_volume
38pub_type
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