Abstract
mRNA is sequestered and turned over in cytoplasmic processing bodies (PBs), which are induced by various cellular stresses. Unexpectedly, in Saccharomyces cerevisiae, mutants of the small GTPase Arf1 and various secretory pathway mutants induced a significant increase in PB number, compared with PB induction by starvation or oxidative stress. Exposure of wild-type cells to osmotic stress or high extracellular Ca2+mimicked this increase in PB number. Conversely, intracellular Ca2+-depletion strongly reduced PB formation in the secretory mutants. In contrast to PB induction through starvation or osmotic stress, PB formation in secretory mutants and by Ca2+required the PB components Pat1 and Scd6, and calmodulin, indicating that different stressors act through distinct pathways. Consistent with this hypothesis, when stresses were combined, PB number did not correlate with the strength of the translational block, but rather with the type of stress encountered. Interestingly, independent of the stressor, PBs appear as spheres of ∼40–100 nm connected to the endoplasmic reticulum (ER), consistent with the idea that translation and silencing/degradation occur in a spatially coordinated manner at the ER. We propose that PB assembly in response to stress occurs at the ER and depends on intracellular signals that regulate PB number.
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Dates
Type | When |
---|---|
Created | 15 years, 2 months ago (June 2, 2010, 10:38 p.m.) |
Deposited | 3 years, 9 months ago (Oct. 28, 2021, 4:49 p.m.) |
Indexed | 4 months, 2 weeks ago (April 9, 2025, 7:24 p.m.) |
Issued | 15 years ago (Aug. 1, 2010) |
Published | 15 years ago (Aug. 1, 2010) |
Published Print | 15 years ago (Aug. 1, 2010) |
@article{Kilchert_2010, title={Defects in the Secretory Pathway and High Ca2+Induce Multiple P-bodies}, volume={21}, ISSN={1939-4586}, url={http://dx.doi.org/10.1091/mbc.e10-02-0099}, DOI={10.1091/mbc.e10-02-0099}, number={15}, journal={Molecular Biology of the Cell}, publisher={American Society for Cell Biology (ASCB)}, author={Kilchert, Cornelia and Weidner, Julie and Prescianotto-Baschong, Cristina and Spang, Anne}, editor={Gilmore, Reid}, year={2010}, month=aug, pages={2624–2638} }