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• W4313490824 abstract "Abstract The functions of proteins depend on their spatial and temporal distributions, which are not directly measured by static protein abundance. Under protein misfolding stress, the unfolded protein response (UPR) pathway remediates proteostasis in part by altering the turnover kinetics and spatial distribution of proteins, yet a global view of these spatiotemporal changes has yet to emerge and it is unknown how they affect different cellular compartments and pathways. Here we describe a mass spectrometry-based proteomics strategy and data analysis pipeline, named Simultaneous Proteome Localization and Turnover (SPLAT), to measure concurrently the changes in protein turnover and subcellular distribution in the same experiment. Investigating two common UPR models of thapsigargin and tunicamycin challenge, we find that the global suppression of protein synthesis during UPR is dependent on subcellular localization, with more severe slowdown in lysosome vs. endoplasmic reticulum (ER) protein turnover. Most candidate translocation events affect pre-existing proteins and likely involve vesicular transport across endomembrane fractions including an expansion of an ER-derived vesicle (ERV) compartment containing RNA binding proteins and stress response proteins. In parallel, we observed specific translocations involving only newly synthesized protein pools that are indicative of endomembrane stalling. The translocation of a subclass of cell surface proteins to the endomembrane including EGFR and ITGAV upon UPR affects only heavy labeled proteins, which suggest their internalization is driven by nascent protein trafficking rather than ligand dependent endocytosis. The approach described here may be broadly useful for inferring the coordinations between spatial and temporal proteome regulations in normal and stressed cells." @default.
• W4313490824 created "2023-01-06" @default.
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• W4313490824 date "2023-01-04" @default.
• W4313490824 modified "2023-09-26" @default.
• W4313490824 title "Simultaneous proteome localization and turnover analysis reveals spatiotemporal dynamics of unfolded protein responses" @default.
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• W4313490824 doi "https://doi.org/10.1101/2023.01.04.521821" @default.
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• W4313490824 hasPublicationYear "2023" @default.
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