The PIWI protein Aubergine recruits eIF3 to activate translation in the germ plasm.

Cell Research
Anne RamatMartine Simonelig

Abstract

Piwi-interacting RNAs (piRNAs) and PIWI proteins are essential in germ cells to repress transposons and regulate mRNAs. In Drosophila, piRNAs bound to the PIWI protein Aubergine (Aub) are transferred maternally to the embryo and regulate maternal mRNA stability through two opposite roles. They target mRNAs by incomplete base pairing, leading to their destabilization in the soma and stabilization in the germ plasm. Here, we report a function of Aub in translation. Aub is required for translational activation of nanos mRNA, a key determinant of the germ plasm. Aub physically interacts with the poly(A)-binding protein (PABP) and the translation initiation factor eIF3. Polysome gradient profiling reveals the role of Aub at the initiation step of translation. In the germ plasm, PABP and eIF3d assemble in foci that surround Aub-containing germ granules, and Aub acts with eIF3d to promote nanos translation. These results identify translational activation as a new mode of mRNA regulation by Aub, highlighting the versatility of PIWI proteins in mRNA regulation.

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Citations

Apr 2, 2020·Biological Chemistry·Iana V KimClaus-D Kuhn
Sep 22, 2020·Trends in Genetics : TIG·Anne Ramat, Martine Simonelig
Mar 7, 2021·International Journal of Molecular Sciences·Kayla J RayfordPius N Nde

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Methods Mentioned

BETA
smFISH
iCLIP
immunoprecipitation
coIP
pull-down
transgenic
PCR
immunoprecipitations
Acetylation
transfection

Software Mentioned

ComBat
Imaris
Leading
Andromeda
sva
R
Gels
R package
Maxquant
ProStar

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