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Nucleoporin Nsp1 surveils the phase state of FG-Nups

ABSTRACT: Transport through the NPC relies on intrinsically disordered FG-Nups forming a selective barrier. Away from the NPC, FG-Nups readily form condensates and aggregates, and we address how this behavior is surveilled in cells. FG-Nups, including Nsp1, together with nuclear transport receptor Kap95, form a native cytosolic condensate in yeast. In aged cells this condensate disappears as cytosolic Nsp1 levels decline. Biochemical assays and modeling show that Nsp1 is a modulator of FG-Nup liquid-liquid phase separation, promoting a liquid-like state. Nsp1’s presence in the cytosol and condensates is critical, as a reduction of cytosolic levels in young cells induces NPC assembly and transport defects and a general decline in protein quality control, all quantitatively mimicking aging phenotypes. Excitingly, these phenotypes can be rescued by cytosolic Nsp1. We conclude that Nsp1 is a phase state regulator that surveils FG-Nups and impacts general protein homeostasis.

INSTRUMENT(S): Orbitrap Exploris 480

ORGANISM(S): Saccharomyces Cerevisiae (baker's Yeast)

SUBMITTER: Justina Clarinda Wolters

LAB HEAD: Justina Clarinda Wolters

PROVIDER: PXD041710 | Pride | 2025-01-27

REPOSITORIES: pride

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	20220318_2022-07.sne	Other
	20220318_2022-07.xlsx	Xlsx
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