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- W2937277142 abstract "Upon Nuclear envelope (NE) fragmentation in the prometaphase the nuclear and cytosolic proteomes blend and must be redefined to reinstate homeostasis. Using a molecular GFP ladder, we show that in early mitosis, condensed chromatin excludes cytosolic proteins. When the NE reforms tightly around condensed chromatin in late mitosis, large GFP multimers are automatically excluded from the nucleus. This can be circumvented by limiting DNA condensation with Q15, a Condensin II inhibitor. Soluble small and other NLS-targeted proteins then swiftly enter the expanding nuclear space. We then examined the proteasome, located in cytoplasm and nucleus. A significant fraction of 20S proteasomes is imported by importin IPO5 within 20 minutes following reformation of the nucleus, after which import comes to an abrupt halt. This suggests that maintaining the nuclear-cytosol distribution after mitosis requires chromatin condensation to exclude cytosolic material from the nuclear space and specialized machineries for nuclear import of large protein complexes such as the proteasome." @default.
- W2937277142 created "2019-04-25" @default.
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- W2937277142 date "2019-01-01" @default.
- W2937277142 modified "2023-10-10" @default.
- W2937277142 title "Homeostasis of soluble proteins and the proteasome post nuclear envelope reformation in mitosis" @default.
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- W2937277142 doi "https://doi.org/10.1242/jcs.225524" @default.
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