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Protein Modifications in the RER

Protein Modifications in the RER

Modification of secretory and transmembrane proteins entering the rough ER begins in the ER lumen. These modifications aid in protein folding and stabilize the acquired tertiary structure. Protein modifications in the rough ER co-occur at different stages of protein folding.
Broadly, these modifications can be categorized into four main categories — glycosylation, formation of disulfide bonds, assembly of protein subunits, and specific proteolytic cleavages like removal of signal sequences.

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...

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...

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...

Rab Proteins

Rab Proteins

Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...

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...

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Related Experiment Video

Updated: May 12, 2026

A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive X Chromosome

A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive X Chromosome

Published on: May 22, 2019

Reticulon1-C modulates protein disulphide isomerase function.

P Bernardoni¹, B Fazi, A Costanzi

¹Department of Biology, University of Rome, Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy.

Cell Death & Disease

|April 6, 2013

Summary

This summary is machine-generated.

Reticulon protein 1-C (RTN1-C) alters protein disulphide isomerase (PDI) localization and activity. RTN1-C decreases PDI

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A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive X Chromosome

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Resin-Assisted Capture Coupled with Isobaric Tandem Mass Tag Labeling for Multiplexed Quantification of Protein Thiol Oxidation

Resin-Assisted Capture Coupled with Isobaric Tandem Mass Tag Labeling for Multiplexed Quantification of Protein Thiol Oxidation

Published on: June 21, 2021

Area of Science:

Cell Biology
Neuroscience
Biochemistry

Background:

The endoplasmic reticulum (ER) is crucial for protein synthesis and folding.
Misfolded proteins in the ER cause neurodegenerative diseases.
Protein disulphide isomerase (PDI) is a key ER chaperone.

Purpose of the Study:

To investigate the role of reticulon protein 1-C (RTN1-C) in ER stress and PDI function.
To explore RTN1-C's impact on PDI localization, activity, and nitrosylation.

Main Methods:

Overexpression of RTN1-C in human neuroblastoma SH-SY5Y cells.
Analysis of PDI subcellular distribution and enzymatic activity.
Investigation of PDI nitrosylation status using RTN1-C mutants.

Main Results:

RTN1-C overexpression caused PDI to redistribute to ER vesicles, increasing its activity.
PDI modulation by RTN1-C correlated with changes in its S-nitrosylation status.
RTN1-C's N-terminal region and microtubule integrity were essential for these effects.

Conclusions:

RTN1-C induces PDI redistribution and modulates its activity by reducing S-nitrosylation.
RTN1-C represents a potential therapeutic target for modulating PDI function in neurodegenerative diseases.