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The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
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Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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Endoplasmic Reticulum Stress and Autophagy.

Zhihao Qi1, Linxi Chen2

  • 1Learning Key Laboratory for Pharmacoproteomics, Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Institute of Pharmacy and Pharmacology, University of South China, Hengyang, 421001, China.

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Summary

Endoplasmic reticulum stress (ERS) triggers cell protection mechanisms like the unfolded protein response (UPR). When these fail, autophagy degrades damaged endoplasmic reticulum, restoring cell homeostasis.

Keywords:
AutophagyEndoplasmic reticulum stressThe endoplasmic reticulum-associated degradationUnfolded protein response

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The endoplasmic reticulum (ER) is a vital organelle in eukaryotic cells, crucial for protein synthesis, modification, and processing.
  • ER homeostasis is maintained through complex intracellular networks but can be disrupted by various stressors like nutrient deficiency, Ca2+ imbalance, toxins, and oxidative stress.

Purpose of the Study:

  • To investigate the cellular response to endoplasmic reticulum stress (ERS) and the mechanisms involved in restoring ER homeostasis.
  • To elucidate the role of the unfolded protein response (UPR) and autophagy in managing ER damage.

Main Methods:

  • Observational study of mouse embryonic fibroblasts (MEFs).
  • Analysis of cellular responses to stress-inducing factors.
  • Examination of the roles of UPR signaling pathways (PERK, IRE1, ATF6) and the ubiquitin-proteasome system.
  • Investigation of autophagic pathways in ER damage repair.

Main Results:

  • ERS initiates protective events, including the UPR, to refold misfolded proteins.
  • The UPR and ubiquitin-proteasome system are insufficient to restore ER function under persistent or severe stress.
  • Autophagy plays a critical role in degrading damaged ER fragments when stress is prolonged.

Conclusions:

  • Autophagy serves as a crucial, potentially final, mechanism for restoring endoplasmic reticulum homeostasis following severe or persistent stress.
  • Understanding these pathways is key to comprehending cellular survival strategies under adverse conditions.