ArticleMolecular biology reports2024
Fission yeast Bsd1 is required for ER stress response in Ire1 independent manner.
Article in Molecular biology reports, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundEndoplasmic reticulum plays a central role in protein folding and cellular detoxification. NEDD4, a HECT E3 ubiquitin ligase, has been implicated in endoplasmic reticulum stress in humans. In this study, we have explored the role of S. pombe Bsd1, an ortholog of mammalian Ndfip1 (NEDD4 interacting protein 1) in tunicamycin-induced stress response pathway. METHODS AND
resultsBsd1, an ortholog of mammalian NEDD4 interacting protein 1 (Ndfip1) plays a protective role against tunicamycin-induced ER stress. The confocal microscopy using GFP tagged Bsd1 revealed its localization to the membrane, with a more pronounced signal in the presence of tunicamycin. Additionally, the expression analysis showed a two-fold increase in the expression of Bsd1 after 4 h exposure to tunicamycin. Furthermore, acridine orange/ ethidium bromide staining and MTT assay revealed an increase in apoptotic cell death in bsd1Δ as compared to wild type cells after treatment with ER stressors. Compared to the wild type, we observed punctate FM4-64 staining in bsd1Δ cells in the presence of tunicamycin suggesting a significant loss of vacuolar structures. In a genetic interaction analysis, we observed enhanced sensitivity of tunicamycin in bsd1Δ ire1Δ double mutant as compared to each single mutant, suggesting the role of Bsd1 in the tunicamycin-induced ER stress response might be independent of the Ire1 pathway.
conclusionOur study has implicated the role of fission yeast Bsd1 in ER stress response in an Ire1 independent pathway. Further, we have shown its role in apoptotic cell death and the maintenance of vacuolar structures.
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