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Updated: May 1, 2026

Monitoring eIF4F Assembly by Measuring eIF4E-eIF4G Interaction in Live Cells
Published on: May 1, 2020
Activation of a GPCR leads to eIF4G phosphorylation at the 5' cap and to IRES-dependent translation
Kelly León1, Thomas Boulo1, Astrid Musnier1
1UMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling Systems (BIOS)»CNRS, UMR7247, F-37380 Nouzilly, FranceUniversité François RabelaisF-37041 Tours, FranceIFCEF-37380 Nouzilly, FranceUniversité Pierre et Marie CurieUniversity of Paris VI, CNRS, UMR 7150 Mer et Santé, Equipe Traduction, Cycle Cellulaire, et Développement, Station Biologique de Roscoff, F-29239 Roscoff, FranceUniversité Européenne de BretagneF-29239 Roscoff, FranceBioinformatics GroupDepartment of Computer Science, University of Freiburg, Freiburg, GermanyUMR85Unité Physiologie de la Reproduction et des Comportements, F-37380 Nouzilly, FranceGroup «Biology and Bioinformatics of Signaling System
Abstract:
The control of mRNA translation has been mainly explored in response to activated tyrosine kinase receptors. In contrast, mechanistic details on the translational machinery are far less available in the case of ligand-bound G protein-coupled receptors (GPCRs). In this study, using the FSH receptor (FSH-R) as a model receptor, we demonstrate that part of the translational regulations occurs by phosphorylation of the translation pre-initiation complex scaffold protein, eukaryotic initiation factor 4G (eIF4G), in HEK293 cells stably expressing the FSH-R. This phosphorylation event occurred when eIF4G was bound to the mRNA 5' cap, and probably involves mammalian target of rapamycin. This regulation might contribute to cap-dependent translation in response to FSH. The cap-binding protein eIF4E also had its phosphorylation level enhanced upon FSH stimulation. We also show that FSH-induced signaling not only led to cap-dependent translation but also to internal ribosome entry site (IRES)-dependent translation of some mRNA. These data add detailed information on the molecular bases underlying the regulation of selective mRNA translation by a GPCR, and a topological model recapitulating these mechanisms is proposed.
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