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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.
The proteasome is an...
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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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Activity-based probes for the multicatalytic proteasome.

David S Hewings1,2,3,4, John A Flygare1, Ingrid E Wertz2,3

  • 1Discovery Chemistry, Genentech, South San Francisco, CA, USA.

The FEBS Journal
|January 21, 2017
PubMed
Summary
This summary is machine-generated.

Activity-based probes enable monitoring of proteasome activity in live cells. These tools aid in understanding proteasome function and developing targeted proteasome inhibitor drugs.

Keywords:
activity-based probeactivity-based protein profilingcovalent inhibitorproteaseproteasomeproteasome inhibitorproteolysis

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Proteasomes are crucial for protein degradation and cellular regulation.
  • Eukaryotic proteasomes possess catalytic subunits (β1, β2, β5) with distinct specificities.
  • Proteasome variants exist, but their functions remain incompletely understood.

Purpose of the Study:

  • To review the development of proteasome activity-based probes.
  • To discuss the application of these probes in understanding proteasome biology.
  • To highlight their role in evaluating proteasome inhibitor drugs.

Main Methods:

  • Development of broad-spectrum and subunit-specific activity-based probes.
  • Probes covalently label active sites of proteasome subunits.
  • Reporter tags identify labeled subunits for analysis.

Main Results:

  • Activity-based probes facilitate direct monitoring of proteasome activity in live cells and tissues.
  • These probes have elucidated the roles of individual proteasome subunits.
  • Probe utility in assessing proteasome inhibitor efficacy and selectivity is demonstrated.

Conclusions:

  • Activity-based probes are essential tools for proteasome research.
  • They advance the understanding of proteasome function and dysfunction.
  • These probes are instrumental in the development of novel proteasome-targeted therapeutics.