Atypical nuclear envelope condensates linked to neurological disorders reveal nucleoporin-directed chaperone activities.
Atypical nuclear envelope condensates linked to neurological disorders reveal nucleoporin-directed chaperone activities.
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DOI:
10.1038/s41556-022-01001-y
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发表时间:
2022-11
影响因子:
21.3
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中科院分区:
文献类型:
--
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DYT1 dystonia is a debilitating neurological movement disorder arising from mutation in the AAA+ ATPase TorsinA. The hallmark of Torsin dysfunction is nuclear envelope blebbing resulting from defects in nuclear pore complex biogenesis. Whether blebs actively contribute to disease manifestation is unknown. We report that FG-nucleoporins (FG-Nups) in the bleb lumen form aberrant condensates and contribute to DYT1 dystonia by provoking two proteotoxic insults. Short-lived ubiquitylated proteins that are normally rapidly degraded partition into the bleb lumen and become stabilized. Additionally, blebs selectively sequester a specific HSP40/HSP70 chaperone network that is modulated by the bleb component MLF2. MLF2 suppresses the ectopic accumulation of FG-Nups and modulates the selective properties and size of condensates in vitro. Our studies identify dual mechanisms of proteotoxicity in the context of condensate formation and establish FG-Nup-directed activities for a nuclear chaperone network.
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