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• W2949063755 abstract "Abstract The CCR4–NOT complex plays an important role in the translational repression and deadenylation of mRNAs. However, little is known about the specific roles of interacting factors. We demonstrate that the DEAD-box helicases eIF4A2 and DDX6 interact directly with the MA3 and MIF domains of CNOT1 and compete for binding. Furthermore, we now show that incorporation of eIF4A2 into the CCR4–NOT complex inhibits CNOT7 deadenylation activity in contrast to DDX6 which enhances CNOT7 activity. Polyadenylation tests (PAT) on endogenous mRNAs determined that eIF4A2 bound mRNAs have longer poly(A) tails than DDX6 bound mRNAs. Immunoprecipitation experiments show that eIF4A2 does not inhibit CNOT7 association with the CCR4–NOT complex but instead inhibits CNOT7 activity. We identified a CCR4–NOT interacting factor, TAB182, that modulates helicase recruitment into the CCR4–NOT complex, potentially affecting the outcome for the targeted mRNA. Together, these data show that the fate of an mRNA is dependent on the specific recruitment of either eIF4A2 or DDX6 to the CCR4–NOT complex which results in different pathways for translational repression and mRNA deadenylation." @default.
• W2949063755 created "2019-06-27" @default.
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• W2949063755 date "2019-06-10" @default.
• W2949063755 modified "2023-10-14" @default.
• W2949063755 title "DEAD-box helicase eIF4A2 inhibits CNOT7 deadenylation activity" @default.
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• W2949063755 doi "https://doi.org/10.1093/nar/gkz509" @default.
• W2949063755 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6736043" @default.
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• W2949063755 hasPublicationYear "2019" @default.
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