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2015 ; 43
(20
): 9856-73
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Control of the localization and function of a miRNA silencing component TNRC6A by
Argonaute protein
#MMPMID26446993
Nishi K
; Takahashi T
; Suzawa M
; Miyakawa T
; Nagasawa T
; Ming Y
; Tanokura M
; Ui-Tei K
Nucleic Acids Res
2015[Nov]; 43
(20
): 9856-73
PMID26446993
show ga
GW182 family proteins play important roles in microRNA (miRNA)-mediated RNA
silencing. They directly interact with Argonaute (Ago) proteins in processing
bodies (P bodies), cytoplasmic foci involved in mRNA degradation and storage.
Recently, we revealed that a human GW182 family protein, TNRC6A, is a
nuclear-cytoplasmic shuttling protein, and its subcellular localization is
regulated by its own nuclear localization signal and nuclear export signal.
Regarding the further controlling mechanism of TNRC6A subcellular localization,
we found that TNRC6A protein is tethered in P bodies by direct interaction with
Ago2 under Ago2 overexpression condition in HeLa cells. Furthermore, it was
revealed that such Ago proteins might be strongly tethered in the P bodies
through Ago-bound small RNAs. Thus, our results indicate that TNRC6A subcellular
localization is substantially controlled by the interaction with Ago proteins.
Furthermore, it was also revealed that the TNRC6A subcellular localization
affects the RNA silencing activity.