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Related Concept Videos

The Proteasome02:18

The Proteasome

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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.
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...
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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.
The proteasome is an...
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Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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Methods to Discover and Evaluate Proteasome Small Molecule Stimulators.

Rachel A Coleman1, Darci J Trader2

  • 1Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, 610 Purdue Mall, West Lafayette, IN 47907, USA. colema84@purdue.edu.

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|June 28, 2019
PubMed
Summary

Protein accumulation in degenerative diseases can be reduced by stimulating the proteasome system (UPS). This review details methods to identify chemical stimulators for enhancing proteasome activity, aiding in reducing toxic protein load.

Keywords:
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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Medicine

Background:

  • Protein accumulation is a hallmark of degenerative conditions like neurodegenerative diseases and aging.
  • Diminished protein degradation, particularly via the ubiquitin-proteasome system (UPS), contributes to toxic protein buildup.
  • Reduced proteasome activity exacerbates protein aggregation in diseased cells.

Purpose of the Study:

  • To review methods for chemically stimulating proteasome activity.
  • To analyze biochemical and cellular techniques for identifying proteasome stimulators.
  • To explore strategies for reducing toxic protein load in degenerative diseases.

Main Methods:

  • Detailed review of existing literature on proteasome stimulation.
  • Analysis of biochemical assays for measuring proteasome activity.
  • Examination of cellular models for identifying proteasome activators.
  • Discussion of both ubiquitin-dependent and -independent proteasome pathways.

Main Results:

  • Several methods exist to identify and characterize proteasome stimulators.
  • Protease activity can be chemically enhanced to reduce protein load.
  • Biochemical and cellular approaches are crucial for discovering novel stimulators.
  • Understanding both UPS pathways is key to therapeutic development.

Conclusions:

  • Stimulating the ubiquitin-proteasome system offers a potential therapeutic strategy for proteinopathies.
  • Effective identification of proteasome stimulators requires robust biochemical and cellular assays.
  • Targeting proteasome activity may alleviate symptoms in aging and neurodegenerative diseases.