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Related Concept Videos

The Proteasome01:13

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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.
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The Proteasome Structure01:17

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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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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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Monitoring of Ubiquitin-proteasome Activity in Living Cells Using a Degron dgn-destabilized Green Fluorescent Protein GFP-based Reporter Protein
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The amazing ubiquitin-proteasome system: structural components and implication in aging.

Eleni N Tsakiri1, Ioannis P Trougakos1

  • 1Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens, Greece.

International Review of Cell and Molecular Biology
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PubMed
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The ubiquitin-proteasome system (UPS) maintains cellular health by clearing damaged proteins. Its decline with age contributes to diseases, suggesting UPS activation may offer anti-aging benefits.

Keywords:
AgingProteasomeProtein quality controlProteostasis networkUbiquitin

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Aging Research

Background:

  • Proteome quality control (PQC) is essential for cellular function, maintained by the proteostasis network (PN).
  • The ubiquitin-proteasome system (UPS) is a key component of the PN, responsible for identifying and degrading misfolded or damaged proteins.
  • Aging leads to compromised UPS function, increasing proteotoxic stress and contributing to age-related diseases.

Purpose of the Study:

  • To review the components and functions of the UPS.
  • To examine how UPS function changes during cellular senescence and organismal aging.
  • To explore the potential of UPS activation as an anti-aging strategy.

Main Methods:

  • Literature review and synthesis of existing research on the UPS.
  • Analysis of studies detailing UPS alterations in aging and senescence.
  • Conceptual proposal for therapeutic intervention targeting the UPS.

Main Results:

  • The UPS is crucial for PQC across cellular compartments (nucleus, ER, mitochondria).
  • UPS function deteriorates with age, correlating with increased proteotoxicity and age-related pathologies.
  • The UPS interacts with other degradation pathways like autophagy-lysosome system.

Conclusions:

  • UPS dysfunction is a significant factor in aging and associated diseases.
  • Mild activation of the UPS in younger organisms may promote longevity and prevent age-related conditions.
  • Targeting the UPS presents a promising avenue for anti-aging interventions.