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Related Concept Videos

The Unfolded Protein Response01:37

The Unfolded Protein Response

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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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Regulation of the Unfolded Protein Response01:31

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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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Role of ER in the Secretory Pathway01:17

Role of ER in the Secretory Pathway

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Eukaryotic cells have a special pathway that enables communication between various intracellular membrane-bound compartments and also with the extracellular environment. This pathway is termed as the secretory pathway.
Components of the secretory pathway
About a third of proteins synthesized in the cell are sorted via the secretory route. They shuffle between different compartments in membrane-bound vesicles until they reach their final destination. The main intracellular compartments involved...
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Export of Misfolded Proteins out of the ER01:32

Export of Misfolded Proteins out of the ER

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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

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Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
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Directing Proteins to the Rough Endoplasmic Reticulum01:34

Directing Proteins to the Rough Endoplasmic Reticulum

18.1K
The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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Author Spotlight: Exploring the Role of Unfolded Protein Response in HIV-1 Replication and Infectivity
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Unfolded Protein Response at the Crossroads: Integrating Endoplasmic Reticulum Stress with Cellular Stress Networks.

Sebastian Gawlak-Socka1, Edward Kowalczyk1, Anna Wiktorowska-Owczarek1

  • 1Department of Pharmacology and Toxicology, Medical University of Lodz, Zeligowskiego 7/9, 90-752 Lodz, Poland.

International Journal of Molecular Sciences
|February 27, 2026
PubMed
Summary

The unfolded protein response (UPR) manages cellular stress by coordinating protein folding in the endoplasmic reticulum (ER). Transient UPR activation aids adaptation, while sustained ER stress leads to cell dysfunction and apoptosis.

Keywords:
autophagyendoplasmic reticulum stressinflammationmetabolic stressoxidative stressunfolded protein response

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The endoplasmic reticulum (ER) is crucial for cellular proteostasis, managing protein folding, lipid metabolism, and calcium signaling.
  • Disruptions in ER function trigger the unfolded protein response (UPR), a conserved signaling network involving PERK, IRE1α, and ATF6.

Purpose of the Study:

  • To review mechanistic insights into UPR signaling pathways.
  • To explore the crosstalk between UPR and other cellular stress responses, including oxidative stress, mitochondrial function, autophagy, and inflammation.
  • To provide a framework for understanding ER proteostasis and cell fate decisions under stress.

Main Methods:

  • Integration of evidence from biochemical and structural studies.
  • Analysis of genetic and pharmacological perturbation models.
  • Review of in vivo investigations from PubMed and Google Scholar (2000-2025).

Main Results:

  • Transient UPR activation promotes cellular adaptation via coordinated transcriptional, translational, and organelle-specific responses.
  • Sustained or unresolved ER stress shifts UPR signaling towards maladaptive outcomes like mitochondrial dysfunction, dysregulated autophagy, oxidative imbalance, and apoptosis.
  • The UPR is a central coordinator of diverse cellular stress-response pathways, not just a stress-mitigating mechanism.

Conclusions:

  • The UPR plays a pivotal role in cellular adaptation and survival under stress.
  • Understanding the interconnectedness of UPR with other stress pathways is key to deciphering cell fate decisions.
  • Dysregulation of UPR signaling contributes to cellular dysfunction and disease progression.