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Related Concept Videos

Endoplasmic Reticulum01:39

Endoplasmic Reticulum

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The Endoplasmic Reticulum (ER) in eukaryotic cells is a substantial network of interconnected membranes with diverse functions, from calcium storage to biomolecule synthesis. A primary component of the endomembrane system, the ER manufactures phospholipids critical for membrane function throughout the cell. Additionally, the two distinct regions of the ER specialize in the manufacture of specific lipids and proteins.
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The Endoplasmic Reticulum01:43

The Endoplasmic Reticulum

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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,...
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Directing Proteins to the Rough Endoplasmic Reticulum01:34

Directing Proteins to the Rough Endoplasmic Reticulum

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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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Smooth Endoplasmic Reticulum01:21

Smooth Endoplasmic Reticulum

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Smooth endoplasmic reticulum or smooth ER is a sub-organelle with specialized functions in animal cells and plant cells. It is often associated with the tubule morphology of the endoplasmic reticulum.
The ER provides optimal conditions for synthesizing steroid hormones and lipids, such as phospholipids and triglycerides. Traditionally, lipid metabolism was considered to be a smooth ER function. However, there is no direct evidence to prove that rough ER is completely excluded from lipid...
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Quality Control01:05

Quality Control

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Quality control is one of the three cyclical quality assurance activities that help keep a system under statistical control. Typical quality control activities include creating quality control charts, conducting proficiency testing, and documenting and archiving results.
Quality control helps track data, visualize trends, and identify variations, making it easier to detect deviations that may affect the accuracy of an analysis. One way to do this is by generating a quality control chart, which...
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Protein Folding Quality Check in the RER01:29

Protein Folding Quality Check in the RER

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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: Jan 26, 2026

Visualization of Endoplasmic Reticulum Subdomains in Cultured Cells
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Protein Quality Control in the Endoplasmic Reticulum.

Benjamin M Adams1,2, Michela E Oster1, Daniel N Hebert3,4

  • 1Department of Biochemistry and Molecular Biology, University of Massachusetts, 240 Thatcher Road, Amherst, MA, 01003, USA.

The Protein Journal
|April 21, 2019
PubMed
Summary

The endoplasmic reticulum (ER) uses protein quality control networks, including chaperones and carbohydrate/thiol systems, to ensure proper protein folding and homeostasis. These systems target misfolded proteins for degradation, preventing harmful aggregate formation.

Keywords:
Endoplasmic reticulumMolecular chaperonesN-linked glycosylationOxidoreductasesQuality controlSecretory pathway

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Visualization of Endoplasmic Reticulum Subdomains in Cultured Cells
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The endoplasmic reticulum (ER) is crucial for folding and maturation of secreted and membrane proteins.
  • Proper protein folding in the ER is vital for cellular function and maintaining protein homeostasis.
  • Misfolded protein accumulation can lead to cytotoxic aggregates and cellular dysfunction.

Purpose of the Study:

  • To review the protein quality control (PQC) networks within the ER.
  • To describe the different families comprising the ER PQC system.
  • To discuss the functions of individual components within these PQC networks.

Main Methods:

  • This review synthesizes existing literature on ER protein quality control mechanisms.
  • It categorizes PQC components into three main families: classical chaperones, carbohydrate-dependent systems, and thiol-dependent systems.
  • The review examines the roles of these families in protein folding, trafficking, and degradation.

Main Results:

  • The ER PQC network comprises classical chaperones, carbohydrate-dependent systems, and thiol-dependent systems.
  • These systems cooperatively ensure proper protein folding and trafficking.
  • Misfolded proteins are retained and targeted for degradation via these quality control mechanisms.

Conclusions:

  • The ER protein quality control network is essential for maintaining cellular health by managing protein folding and homeostasis.
  • The coordinated action of chaperones, carbohydrate-dependent, and thiol-dependent systems is key to this process.
  • Understanding these networks provides insight into protein misfolding diseases.