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Related Concept Videos

The Proteasome01:13

The Proteasome

1.9K
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 Proteasome02:18

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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.
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The Proteasome02:18

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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.
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The Proteasome Structure01:17

The Proteasome Structure

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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.
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Assaying Proteasomal Degradation in a Cell-free System in Plants
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Proteasomal and Autophagic Degradation Systems.

Ivan Dikic1,2

  • 1Institute of Biochemistry II, School of Medicine, Goethe University, 60598 Frankfurt am Main, Germany;

Annual Review of Biochemistry
|May 2, 2017
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Summary

Cellular quality control relies on autophagy and the ubiquitin-proteasome system. This review explores their interconnectedness for maintaining homeostasis and potential therapeutic targets.

Keywords:
UPSaggrephagyautophagychaperonemitophagyorganelle homeostasisp62–Keap1–Nrf2proteasomeproteostasisubiquitinationxenophagy

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Autophagy and the ubiquitin-proteasome system are critical cellular quality control pathways.
  • These systems maintain cellular homeostasis and protect against age-related diseases.
  • Ubiquitination signals cargo for degradation via either the proteasome or lysosome.

Purpose of the Study:

  • To review the molecular mechanisms underlying the functional interconnection between autophagy and the ubiquitin-proteasome system.
  • To identify common communication principles and nodes within these pathways.
  • To highlight therapeutic opportunities arising from the interplay of these systems.

Main Methods:

  • Literature review of molecular and cellular biology studies.
  • Analysis of signaling pathways and protein interactions.
  • Synthesis of current knowledge on proteostasis and organelle quality control.

Main Results:

  • Detailed molecular insights into how proteasome and autophagy pathways interact.
  • Identification of key intersection points and communication networks.
  • Ubiquitin marking serves as a shared signal for distinct degradation routes.

Conclusions:

  • Autophagy and the ubiquitin-proteasome system are functionally integrated for cellular maintenance.
  • Understanding their communication offers novel therapeutic strategies for diseases.
  • Targeting these interconnected pathways can restore proteostasis and organelle health.