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• W4221064856 abstract "Abstract Compartmentalization of organelles in space and time affects their functional state and enables higher order regulation of essential cellular processes. How organellar residence is maintained in a defined area of the cell remains poorly understood. In this study, we uncover a new role for intermediate filaments in the maintenance of organellar architecture and dynamics, which is executed through a functional connection between Vimentin and the ER-embedded ubiquitin ligase ring finger protein 26 (RNF26). While the ubiquitin ligase function of RNF26 promotes perinuclear positioning of endolysosomes, its catalytically inactive mutant I382R preferentially binds Vimentin through the RNF26 C-terminal tail. Loss of either RNF26 or Vimentin redistributes endolysosomes throughout the cytosol and mobilizes ER membranes from the perinuclear ER towards the periphery. Furthermore, RNF26 and Vimentin control changes in ER morphology and organelle compartmentalization during ER stress. Collectively, we define a new function for Vimentin-containing intermediate filaments as anchors of a dynamic interplay between the ER and endosomes, critical to the integrity of the perinuclear ER and corresponding perinuclear endosomal cloud during homeostatic and stress conditions. Synopsis The perinuclear area hosts a wide variety of cellular organelles, and their interaction with the ER governs essential cellular processes. To spatiotemporally organize endosomes and ER in the perinuclear region, the ER-embedded E3 ubiquitin ligase RNF26 interacts with Vimentin to physically link the perinuclear ER membrane with the intermediate filament cytoskeleton. As a result, Vimentin ensures perinuclear RNF26 retention, which in turn controls the perinuclear location of ER membranes and endosomes, which can be affected during stressed conditions. Vimentin interacts with inactive RNF26 in the ER membrane RNF26 by virtue of the Vimentin interaction controls perinuclear organization of ER membranes and the endosomal system Vimentin immobilizes ER membranes in the perinuclear area Vimentin and RNF26 compartmentalize organelles in the perinuclear region during ER stress We define a new function of Vimentin intermediate filaments in the control of the perinuclear endosomal and ER organization" @default.
• W4221064856 created "2022-04-03" @default.
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• W4221064856 date "2022-03-24" @default.
• W4221064856 modified "2023-09-28" @default.
• W4221064856 title "Vimentin intermediate filaments organize organellar architecture in response to ER stress" @default.
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• W4221064856 doi "https://doi.org/10.1101/2022.03.24.485587" @default.
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