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Related Concept Videos

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 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...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...

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Proteasome selectivity towards Michael acceptor containing oligopeptide-based inhibitors.

Wouter A van der Linden1, Paul P Geurink, Chris Oskam

  • 1Leiden Institute of Chemistry and Netherlands Proteomics Centre, P.O. Box 9502, 2300 RA, Leiden, The Netherlands.

Organic & Biomolecular Chemistry
|May 8, 2010
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Summary

Researchers synthesized novel Michael acceptors as potential proteasome inhibitors. A new labeling strategy identified cellular targets, offering an alternative to traditional gel-based assays for proteasome inhibitor research.

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Area of Science:

  • Medicinal Chemistry
  • Chemical Biology
  • Proteomics

Background:

  • The proteasome is a critical cellular machine involved in protein degradation.
  • Developing targeted proteasome inhibitors is a key strategy in cancer therapy.
  • Novel chemical scaffolds are needed to identify new proteasome inhibitors with improved specificity.

Purpose of the Study:

  • To synthesize and biologically evaluate novel Michael acceptors as potential proteasome inhibitors.
  • To identify the cellular targets of azide-containing inhibitors using a chemical biology approach.
  • To establish an efficient method for target identification and validation.

Main Methods:

  • Synthesis of ten novel Michael acceptors.
  • Cellular target engagement studies in HEK293T and RAW264.7 cell lines.
  • A two-step labeling strategy followed by biotin-pulldown and affinity purification.
  • On-bead tryptic digestion and liquid chromatography-tandem mass spectrometry (LC-MS^2) for protein identification.

Main Results:

  • Successful synthesis of ten potential proteasome inhibitor compounds.
  • Identification of specific cellular targets for the azide-containing inhibitors.
  • Demonstration of the efficacy of the labeling and mass spectrometry-based strategy for target deconvolution.
  • The developed method proved effective in identifying proteasome-interacting proteins.

Conclusions:

  • The synthesized Michael acceptors show promise as proteasome inhibitors.
  • The novel two-step labeling and LC-MS^2 strategy is a powerful tool for identifying proteasome inhibitor targets.
  • This approach offers a viable alternative to conventional gel-based assays for target identification in chemical biology.