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TBL2 Associates With ATF4 mRNA Via Its WD40 Domain and Regulates Its Translation During ER Stress.

J. Cell. Biochem.2016 Feb;117(2):500-9. doi:10.1002/jcb.25301
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摘要


PKR-like ER-resident kinase (PERK) phosphorylates eukaryotic translation initiation factor 2 α (eIF2α) under endoplasmic reticulum (ER) stress; this results in repression of general translation and induction of specific gene expression, such as activating transcription factor 4 (ATF4). We previously showed that, upon ER stress, transducin (β)-like 2 (TBL2) was an ER-localized transmembrane protein and interacted with PERK and that TBL2 was involved in ATF4 expression and cell survival. Here, we show that TBL2 is able to associate with ATF4 mRNA and regulate its translation. The RNA-immunoprecipitation analysis using several TBL2 deletion mutants revealed that the WD40 domain was essential for association with ATF4 mRNA. Importantly, suppression of TBL2 by knockdown or overexpression of the TBL2 mutant with a defective WD40 domain diminished ATF4 induction at the translational level. Thus, our findings indicate that, under ER stress, TBL2 participates in ATF4 translation through its association with the mRNA.

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