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- W2021145710 abstract "Endoplasmic reticulum (ER) stress triggers the cytoplasmic splicing of XBP1 mRNA by the transmembrane endoribonuclease IRE1alpha, resulting in activation of the unfolded protein response, which maintains ER homeostasis. We show that the unspliced XBP1 (XBP1u) mRNA is localized to the membrane, although its product is neither a secretory nor a membrane protein and is released to the cytosol after splicing. Biochemical and mutagenic analyses demonstrated that membrane localization of XBP1u mRNA required its in-frame translation. An insertional frame-shift mutation greatly diminished both membrane localization and splicing of the XBP1u mRNA. Furthermore, membrane localization was compromised by puromycin treatment and required a hydrophobic region within XBP1u. These data demonstrate that the nascent XBP1u polypeptide recruits its own mRNA to the membrane. This system serves to enhance cytoplasmic splicing and could facilitate a more rapid response to ER stress, and represents a unique way of cotranslational protein targeting coupled to mRNA maturation." @default.
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- W2021145710 date "2009-04-01" @default.
- W2021145710 modified "2023-10-16" @default.
- W2021145710 title "Cotranslational Targeting of XBP1 Protein to the Membrane Promotes Cytoplasmic Splicing of Its Own mRNA" @default.
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- W2021145710 doi "https://doi.org/10.1016/j.molcel.2009.02.033" @default.
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