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Related Concept Videos

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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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Using In Vitro Fluorescence Resonance Energy Transfer to Study the Dynamics Of Protein Complexes at a Millisecond Time Scale
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TRAF2 associates with cullin neddylation complex assembly.

Tiantian Wang1,2, Qi Zhang1,2, Yu Xu1,2

  • 1Center for Chemical Biology, Institute of Interdisciplinary Integrative Medicine Research, Shanghai University of Traditional Chinese Medicine, China.

The FEBS Journal
|July 9, 2024
PubMed
Summary

Researchers discovered liquidambaric acid (LDA), a natural product that selectively inhibits cullin 2 neddylation by targeting TRAF2. This finding offers a new approach for modulating cullin neddylation pathways.

Keywords:
Cul2TRAF2cullinliquidambaric acidneddylation

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Biology

Background:

  • Cullin-based RING ligases (CRLs) are the largest family of ubiquitin E3 ligases.
  • Cullin neddylation tightly regulates CRL activity and is implicated in various diseases.
  • Selective inhibitors for individual cullins are lacking, hindering targeted therapeutic development.

Purpose of the Study:

  • To identify small molecules with selective inhibition properties against specific cullin neddylation.
  • To elucidate the mechanism of action for selective cullin neddylation inhibitors.

Main Methods:

  • High-throughput screening to identify natural products inhibiting cullin neddylation.
  • Biochemical assays to confirm target engagement and mechanism of action.
  • Co-immunoprecipitation and Western blotting to study protein-protein interactions.

Main Results:

  • Liquidambaric acid (LDA) was identified as a natural product with selective inhibitory activity against cullin 2 (Cul2) neddylation.
  • Tumor Necrosis Factor receptor-associated factor 2 (TRAF2) was identified as the direct target of LDA, essential for its activity.
  • LDA disrupts the association between TRAF2 and the neddylation machinery, inhibiting NEDD8 transfer and blocking Cul2 neddylation.

Conclusions:

  • TRAF2 plays a crucial role in regulating cullin neddylation cascades.
  • LDA represents a novel small molecule for the selective modulation of cullin 2 neddylation.
  • This discovery opens avenues for developing targeted therapies for diseases associated with CRL dysregulation.