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4EHP and GIGYF1/2 Mediate Translation-Coupled Messenger RNA Decay.

ABSTRACT: Current models of mRNA turnover indicate that cytoplasmic degradation is coupled with translation. However, our understanding of the molecular events that coordinate ribosome transit with the mRNA decay machinery is still limited. Here, we show that 4EHP-GIGYF1/2 complexes trigger co-translational mRNA decay. Human cells lacking these proteins accumulate mRNAs with prominent ribosome pausing. They include, among others, transcripts encoding secretory and membrane-bound proteins or tubulin subunits. In addition, 4EHP-GIGYF1/2 complexes fail to reduce mRNA levels in the absence of ribosome stalling or upon disruption of their interaction with the cap structure, DDX6, and ZNF598. We further find that co-translational binding of GIGYF1/2 to the mRNA marks transcripts with perturbed elongation to decay. Our studies reveal how a repressor complex linked to neurological disorders minimizes the protein output of a subset of mRNAs.

SUBMITTER: Weber R

PROVIDER: S-EPMC8984682 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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4EHP and GIGYF1/2 Mediate Translation-Coupled Messenger RNA Decay.

Weber Ramona R Chung Min-Yi MY Keskeny Csilla C Zinnall Ulrike U Landthaler Markus M Valkov Eugene E Izaurralde Elisa E Igreja Cátia C

Cell reports 20201001 2

Current models of mRNA turnover indicate that cytoplasmic degradation is coupled with translation. However, our understanding of the molecular events that coordinate ribosome transit with the mRNA decay machinery is still limited. Here, we show that 4EHP-GIGYF1/2 complexes trigger co-translational mRNA decay. Human cells lacking these proteins accumulate mRNAs with prominent ribosome pausing. They include, among others, transcripts encoding secretory and membrane-bound proteins or tubulin subuni ...[more]

PMID: 33053355

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4EHP and GIGYF1/2 induce translation-coupled messenger RNA decay

Project description:Although canonical mRNA degradation is generally recognized to be translation dependent, our understanding of the molecular events that coordinate ribosome movement with the decay machinery is still limited. Here, we show that the 4EHP–GIGYF1/2 complex triggers co-translational mRNA decay as a result of altered ribosome activity during elongation. Human cells lacking 4EHP and GIGYF1 and 2 proteins accumulate transcripts known to be degraded in a translation dependent manner or with prominent ribosome pausing. These include mRNAs encoding secretory and membrane-bound proteins or specific tubulin isotypes, among others. 4EHP–GIGYF1/2 fails to reduce target mRNA levels in the absence of ribosome stalling or upon disruption of its interaction with the cap structure, DDX6 and a GYF domain-associated protein. Our studies reveal how a repressor complex linked to neurological disorders minimizes the protein output of a subset of mRNAs.

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