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Role of ER in the Secretory Pathway

Role of ER in the Secretory Pathway

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...

The Unfolded Protein Response

The Unfolded Protein Response

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...

Regulation of the Unfolded Protein Response

Regulation of the Unfolded Protein Response

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...

Export of Misfolded Proteins out of the ER

Export of Misfolded Proteins out of the ER

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...

Endoplasmic Reticulum

Endoplasmic Reticulum

Endoplasmic ReticulumThe endoplasmic reticulum (ER) is an extensive network of membranous sacs and tubules in eukaryotic cells, continuous with the outer membrane of the nucleus. This structural continuity integrates nuclear and cytoplasmic processes and facilitates efficient intracellular transport. This allows mRNA to move directly from the nucleus to ribosomes for efficient protein synthesis. As a result, the ER serves as a central site for the synthesis, processing, and distribution of...

Post-translational Translocation of Proteins to the RER

Post-translational Translocation of Proteins to the RER

A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
Targeting proteins to the ER
Hsp40 and Hsp70 chaperone molecules bind the translated proteins in the cytosol to prevent their folding. The chaperone binding helps to keep the signal...

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Related Experiment Video

Updated: Jul 8, 2026

Measuring Endoplasmic Reticulum Stress and Unfolded Protein Response in HIV-1 Infected T-Cells and Analyzing its Role in HIV-1 Replication

Measuring Endoplasmic Reticulum Stress and Unfolded Protein Response in HIV-1 Infected T-Cells and Analyzing its Role in HIV-1 Replication

Published on: June 14, 2024

Broad Roles of Endoplasmic Reticulum Stress Sensors Activated by Diverse Pathophysiological Stimuli.

Kenshiro Fujise¹, Himari Kimura¹, Tomoki Tsuji¹

¹Department of Frontier Science and Interdisciplinary Research, Faculty of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 920-8640 Kanazawa, Ishikawa, Japan.

Frontiers in Bioscience (Landmark Edition)

|July 7, 2026

Summary

The endoplasmic reticulum (ER) stress response involves sensors like IRE1, PERK, ATF6, and OASIS. These sensors integrate diverse signals beyond protein misfolding, impacting cellular health and disease.

Keywords:

ER stress sensors endoplasmic reticulum (ER)unfolded protein response (UPR)

More Related Videos

Measurements of Physiological Stress Responses in C. Elegans

Measurements of Physiological Stress Responses in C. Elegans

Published on: May 21, 2020

Related Experiment Videos

Last Updated: Jul 8, 2026

Measuring Endoplasmic Reticulum Stress and Unfolded Protein Response in HIV-1 Infected T-Cells and Analyzing its Role in HIV-1 Replication

Measuring Endoplasmic Reticulum Stress and Unfolded Protein Response in HIV-1 Infected T-Cells and Analyzing its Role in HIV-1 Replication

Published on: June 14, 2024

Measurements of Physiological Stress Responses in C. Elegans

Measurements of Physiological Stress Responses in C. Elegans

Published on: May 21, 2020

Area of Science:

Cellular Biology
Molecular Biology
Biochemistry

Background:

The endoplasmic reticulum (ER) stress response is vital for maintaining cellular homeostasis.
Canonical pathways, including the unfolded protein response (UPR), are activated by misfolded proteins.
ER stress sensors (IRE1, PERK, ATF6, OASIS) traditionally mediate UPR signaling.

Purpose of the Study:

To explore emerging non-canonical pathways of ER stress.
To understand ER stress sensors as integrators of diverse cellular stresses.
To discuss the expanded functional scope of ER stress signaling.

Main Methods:

Review of current literature on ER stress signaling.
Analysis of canonical and non-canonical activation mechanisms.
Integration of findings on sensor function in diverse stress conditions.

Main Results:

ER stress sensors activate non-canonical pathways independent of proteotoxicity.
These sensors integrate signals from integrated stress response, lipid bilayer stress, and DNA damage.
ER stress sensors act as multidimensional hubs for proteotoxic, metabolic, and genomic stresses.

Conclusions:

ER stress signaling extends beyond the UPR to encompass broader cellular defense mechanisms.
Non-canonical activation broadens the role of ER stress sensors in physiological regulation.
Understanding these pathways is crucial for deciphering ER stress in disease pathogenesis.