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Related Concept Videos

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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Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
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Related Experiment Video

Updated: Jan 17, 2026

Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase
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Oleanolic Acid Amide Derivatives as 20s Proteasome Stimulators.

Jaida M Osman1, Duno S Dantis1, Hanna King2

  • 1Department of Chemistry, University of California, Irvine, California, 92617, USA.

Chembiochem : a European Journal of Chemical Biology
|September 19, 2025
PubMed
Summary

Oleanolic acid derivatives modified at C28 and C3 positions retain proteasome stimulation. Sterically hindered amides at C28 show enhanced activity, suggesting potential for new proteasome probes.

Keywords:
oleanolic acidsprobesproteasomessteroidsstimulators

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Area of Science:

  • Natural Products Chemistry
  • Molecular Pharmacology
  • Medicinal Chemistry

Background:

  • Oleanolic acid (OA), a pentacyclic triterpenoid, is a known proteasome stimulator.
  • Structure-activity relationship (SAR) studies are crucial for optimizing natural products as therapeutic agents.

Purpose of the Study:

  • To investigate the impact of modifications at the C28 and C3 positions of oleanolic acid on proteasome stimulation.
  • To synthesize and evaluate novel OA derivatives for enhanced proteasome-targeting capabilities.

Main Methods:

  • Synthesis of ten amide derivatives of oleanolic acid at the C28 position.
  • Acylation of the hydroxyl group at the C3 position of OA.
  • In-cell testing of synthesized derivatives to assess proteasome stimulation activity.

Main Results:

  • Replacing the C28 carboxylic acid with an amide group maintained or enhanced proteasome stimulation.
  • Amides with increased steric hindrance, particularly ortho-substituted benzyl or isopropyl moieties, exhibited the most potent stimulation.
  • Modifications at the C3 position influenced solubility but did not significantly reduce proteasome stimulation.

Conclusions:

  • The C28 position of oleanolic acid is amenable to derivatization with amides, yielding potent proteasome stimulators.
  • Steric bulk at C28 is a key feature for enhanced proteasome activation.
  • These findings provide a basis for designing novel oleanolic acid-based proteasome probes and potential therapeutics.