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• W4313426697 abstract "Abstract Aberrant accumulation of inner nuclear membrane (INM) proteins is associated with deformed nuclear morphology and mammalian diseases. However, the mechanisms underlying the maintenance of INM homeostasis remain poorly understood. In this study, we explored the degradation mechanisms of the INM protein, Bqt4, in the fission yeast Schizosaccharomyces pombe . We have previously shown that Bqt4 interacts with the transmembrane protein Bqt3 at the INM and is degraded in the absence of Bqt3. Here, we revealed that excess Bqt4, unassociated with Bqt3, was targeted for degradation by the ubiquitin-proteasome system localized in the nucleus and Bqt3 antagonized this process. The degradation process involved the Doa10 E3 ligase complex at the INM. Bqt4 is a tail-anchored protein and extraction from the membrane by the Cdc48 complex is required for its degradation. The C-terminal transmembrane domain of Bqt4 is necessary and sufficient for proteasome-dependent protein degradation. Accumulation of Bqt4 at the INM impaired cell viability with nuclear envelope deformation, suggesting that quantity control of Bqt4 plays an important role in nuclear membrane homeostasis. Summary statement Appropriate levels of the inner nuclear membrane protein Bqt4 are maintained by ubiquitin-proteasome-mediated degradation. Aberrant accumulation of Bqt4 disturbs nuclear membrane homeostasis." @default.
• W4313426697 created "2023-01-06" @default.
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• W4313426697 date "2022-12-30" @default.
• W4313426697 modified "2023-10-17" @default.
• W4313426697 title "A ubiquitin-proteasome pathway degrades the inner nuclear membrane protein Bqt4 to maintain nuclear membrane homeostasis" @default.
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• W4313426697 doi "https://doi.org/10.1101/2022.12.29.522265" @default.
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