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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...

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...

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...

The Endoplasmic Reticulum

The Endoplasmic Reticulum

The endoplasmic reticulum or ER makes up for more than half of the membranes in a cell and accounts for 10% of total cell volume. It is also the primary protein and lipid synthesis factory for most cell organelles, such as the Golgi apparatus, lysosomes, secretory vesicles, and the plasma membrane. Despite being the most extensive and functionally complex subcellular organelle, ER was the last to be discovered. After years of deliberation, Keith Porter and George Palade in the year 1954,...

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...

Protein Folding Quality Check in the RER

Protein Folding Quality Check in the RER

ER is the primary site for the maturation and folding of soluble and transmembrane secretory proteins. The calnexin cycle is a specific chaperone system that folds and assesses the confirmation of N-glycosylated proteins before they can exit the ER lumen. The primary players of this quality check pipeline are the lectins, ER-resident chaperones, and a glucosyl transferase enzyme. In case the calnexin system in the lumen fails to salvage a misfolded protein, it is transported to the cytoplasm...

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Related Experiment Video

Updated: Jun 5, 2026

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

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Published on: June 14, 2024

Detecting and quantitating physiological endoplasmic reticulum stress.

Ling Qi¹, Liu Yang, Hui Chen

¹Division of Nutritional Sciences, Cornell University, Ithaca, New York, USA.

Methods in Enzymology

|January 27, 2011

Summary

This summary is machine-generated.

Researchers developed a Phos-tag Western blot to detect mild cellular stress. This method quantifies the unfolded protein response (UPR) in vivo, aiding disease diagnosis and therapeutic development.

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Area of Science:

Cellular Biology
Molecular Biology
Biochemistry

Background:

The unfolded protein response (UPR) is a critical cellular defense mechanism implicated in various human diseases, including heart disease, neurodegeneration, and metabolic syndrome.
A significant challenge in studying UPR is the difficulty in detecting and quantifying mild endoplasmic reticulum (ER) stress and UPR activation in physiological and pathological conditions.

Purpose of the Study:

To develop a novel method for the direct visualization and quantitative assessment of mild ER stress and UPR signaling.
To enable the study of UPR at the sensor level in various in vivo conditions.

Main Methods:

A Phos-tag-based Western blot approach was utilized.
The method allows for direct detection and quantification of UPR sensors.

Main Results:

The developed method successfully visualizes and quantifies mild ER stress and UPR signaling in vivo.
This technique provides direct assessment at the UPR sensor level.

Conclusions:

This Phos-tag Western blot method offers a new tool for studying physiological UPR.
The approach is expected to advance the diagnosis of ER-associated diseases and facilitate the development of targeted UPR therapies.