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Related Concept Videos

The Proteasome01:13

The Proteasome

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Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
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The Proteasome Structure01:17

The Proteasome Structure

669
The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
The proteasome is an...
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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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Regulated Protein Degradation02:58

Regulated Protein Degradation

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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
7.1K
Overview of Protein Metabolism01:21

Overview of Protein Metabolism

636
Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
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Proteins: From Genes to Degradation02:11

Proteins: From Genes to Degradation

11.9K
Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick.  Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA...
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Related Experiment Video

Updated: May 21, 2025

Monitoring of Ubiquitin-proteasome Activity in Living Cells Using a Degron dgn-destabilized Green Fluorescent Protein GFP-based Reporter Protein
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Proteasome dynamics in response to metabolic changes.

Cordula Enenkel1, Oliver P Ernst1,2

  • 1Department of Biochemistry, University of Toronto, Toronto, ON, Canada.

Frontiers in Cell and Developmental Biology
|March 18, 2025
PubMed
Summary
This summary is machine-generated.

Proteasomes dynamically move within cells to manage protein levels during metabolic changes. Under stress, they form storage granules, aiding cell survival and fitness.

Keywords:
metabolic regulation of proteasome localizationproteasome condensates in membraneless organellesproteasome storage granulesprotein homeostasis (proteostasis)ubiquitin 26S-proteasome system

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Proteasomes are crucial for protein homeostasis, degrading ubiquitinated proteins via the ubiquitin-proteasome system.
  • The 26S proteasome, comprising core and regulatory particles, is the primary degradation machinery.
  • Cellular metabolic state influences proteasome localization and activity.

Purpose of the Study:

  • To investigate the dynamic intracellular movements and organelle sequestration of proteasomes in response to metabolic changes and stress.
  • To elucidate the role of proteasome condensation in cellular stress resistance and adaptation.

Main Methods:

  • Observational studies on proteasome localization in yeast and mammalian cells under varying metabolic conditions (e.g., nutrient deprivation, stress).
  • Analysis of proteasome behavior within cytoplasmic membraneless organelles, including proteasome storage granules (PSGs) and stress-induced condensates.
  • Exploration of potential mechanisms like liquid-liquid phase separation in proteasome condensation.

Main Results:

  • In metabolically active cells, 26S proteasomes are primarily nuclear.
  • During nutrient deprivation or stress, proteasomes relocate, initially to the nuclear envelope and then to cytoplasmic storage granules or condensates.
  • These proteasome-containing membraneless organelles are dynamic, reversible, and associated with stress resistance and improved cellular fitness.

Conclusions:

  • Proteasome intracellular trafficking and condensation into membraneless organelles are key adaptive responses to metabolic stress.
  • Proteasome storage granules and condensates contribute to cellular resilience, improved fitness, and potentially aging processes.
  • Liquid-liquid phase separation is a likely mechanism driving the formation of these stress-adaptive proteasome structures.