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Related Concept Videos

The Proteasome Structure01:17

The Proteasome Structure

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...
The Proteasome02:18

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst 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. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
The Proteasome01:13

The Proteasome

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 (ubiquitin...
The Proteasome02:18

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst 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. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
Regulated Protein Degradation02:58

Regulated Protein Degradation

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...
Regulated Protein Degradation02:58

Regulated Protein Degradation

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...

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Metabolically regulated proteasome supramolecular organization in situ.

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Proteasome dynamics in response to metabolic changes.

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Related Experiment Video

Updated: May 12, 2026

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
09:57

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach

Published on: December 17, 2016

Proteasome dynamics.

Cordula Enenkel1

  • 1University of Toronto, Medical Sciences Building, Department of Biochemistry, 1 King's College Circle, Toronto, Ontario, Canada M5S 1A8.

Biochimica Et Biophysica Acta
|April 3, 2013
PubMed
Summary
This summary is machine-generated.

Proteasomes, essential cellular machines, dynamically change location and form between the nucleus and cytoplasm during cell division and quiescence. Understanding their transport and assembly is key to cell biology.

Keywords:
Nuclear protein degradationNuclear transportProteasome assemblyProteasome storage granuliQuiescenceUbiquitin-proteasome system

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Assaying Proteasomal Degradation in a Cell-free System in Plants
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Assaying Proteasomal Degradation in a Cell-free System in Plants

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Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
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Monitoring of Ubiquitin-proteasome Activity in Living Cells Using a Degron (dgn)-destabilized Green Fluorescent Protein (GFP)-based Reporter Protein
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Proteasomes are crucial multisubunit protease complexes found in eukaryotic cells.
  • Their localization and assembly state change dynamically between cell division (nuclear holoenzymes) and quiescence (cytosolic clusters).

Purpose of the Study:

  • To summarize current knowledge on proteasome nuclear transport and assembly in yeast.
  • To project findings from yeast to the mammalian cell system.

Main Methods:

  • Review of existing literature on proteasome dynamics in yeast.
  • Extrapolation of yeast findings to mammalian cells.

Main Results:

  • Proteasomes exist as holoenzymes in the nucleus during cell division.
  • During quiescence, proteasomes dissociate and form cytosolic clusters.
  • These clusters disperse, and proteasomes reassemble and return to the nucleus upon exiting quiescence.

Conclusions:

  • The mechanisms governing proteasome transport and assembly remain largely unknown.
  • Further research in model organisms like yeast can inform our understanding of proteasome dynamics in mammalian cells.