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A stress assembly that confers cell viability by preserving ERES components during amino-acid starvation

A stress assembly that confers cell viability by preserving ERES components during amino-acid starvation
Nutritional restriction leads to protein translation attenuation that results in the storage and degradation of free mRNAs in cytoplasmic assemblies. In this study, we show in Drosophila S2 cells that amino-acid starvation also leads to the inhibition of another major anabolic pathway, the protein transport through the secretory pathway, and to the formation of a novel reversible non-membrane bound stress assembly, the Sec body that incorporates components of the ER exit sites. Sec body formation does not depend on membrane traffic in the early secretory pathway, yet requires both Sec23 and Sec24AB. Sec bodies have liquid droplet-like properties, and they act as a protective reservoir for ERES components to rebuild a functional secretory pathway after re-addition of amino-acids acting as a part of a survival mechanism. Taken together, we propose that the formation of these structures is a novel stress response mechanism to provide cell viability during and after nutrient stress.
- University Medical Center Utrecht Netherlands
- Hubrecht Institute for Developmental Biology and Stem Cell Research Netherlands
- Royal Netherlands Academy of Arts and Sciences (KNAW) Netherlands
- Royal Netherlands Academy of Arts and Sciences Netherlands
- Utrecht University Netherlands
QH301-705.5, Cell Survival, Science, stress granule, Endoplasmic Reticulum, Time-Lapse Imaging, Coat Protein Complex I, Stress, Physiological, ER exit site, COPII, Animals, Drosophila Proteins, Biology (General), Amino Acids, amino-acid starvation, protein transport through the secretory pathway, Secretory Pathway, Secretory Vesicles, Q, R, liquid droplet, Biological Transport, Cell Biology, Drosophila melanogaster, Medicine, COP-Coated Vesicles, Fluorescence Recovery After Photobleaching
QH301-705.5, Cell Survival, Science, stress granule, Endoplasmic Reticulum, Time-Lapse Imaging, Coat Protein Complex I, Stress, Physiological, ER exit site, COPII, Animals, Drosophila Proteins, Biology (General), Amino Acids, amino-acid starvation, protein transport through the secretory pathway, Secretory Pathway, Secretory Vesicles, Q, R, liquid droplet, Biological Transport, Cell Biology, Drosophila melanogaster, Medicine, COP-Coated Vesicles, Fluorescence Recovery After Photobleaching
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