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- W2725591970 abstract "Tumor necrosis factor alpha (TNF-α) is expressed promptly during inflammatory responses. Efficient TNF-α mRNA splicing is achieved through a 3' UTR element that activates RNA-dependent eIF2α protein kinase (PKR). The TNF-α RNA activator, we show, folds into a pseudoknot conserved from teleost fish to humans, critical for PKR activation and mRNA splicing. The pseudoknot constrains the RNA into two double-helical stacks having parallel axes, permitting facile PKR dimerization and trans-autophosphorylation needed for kinase activation. Mutations show that the PKR activator potently enhances splicing without inhibiting translation. eIF2α phosphorylation represses translation and is essential for coping with cellular stress, yet PKR-enabled TNF mRNA splicing depends strictly on eIF2α phosphorylation. Indeed, eIF2α phosphorylation at Serine51 is necessary and sufficient to achieve highly efficient splicing, extending its role from negative control of translation to positive control of splicing. This mechanism, operational in human peripheral blood mononuclear cells (PBMCs), links stress signaling to protective immunity through TNF mRNA splicing rendered efficient upon eIF2α phosphorylation." @default.
- W2725591970 created "2017-07-14" @default.
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- W2725591970 date "2017-07-01" @default.
- W2725591970 modified "2023-10-14" @default.
- W2725591970 title "An Ancient Pseudoknot in TNF-α Pre-mRNA Activates PKR, Inducing eIF2α Phosphorylation that Potently Enhances Splicing" @default.
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- W2725591970 doi "https://doi.org/10.1016/j.celrep.2017.06.035" @default.
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