Related Experiment Video

Updated: Mar 23, 2026

Using In Vitro Fluorescence Resonance Energy Transfer to Study the Dynamics Of Protein Complexes at a Millisecond Time Scale
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Using In Vitro Fluorescence Resonance Energy Transfer to Study the Dynamics Of Protein Complexes at a Millisecond Time Scale

Published on: March 14, 2019

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CAND1 and CAND2 drive CUL4 substrate receptor exchange with largely comparable biochemical efficiency, unlike their

Kankan Wang1, Sebastian Kenny2, Zhana Chagan1

  • 1Department of Biochemistry, Purdue University, West Lafayette, IN 47907, USA.

Structure (London, England : 1993)
|March 21, 2026
PubMed

Insights

Cullin-RING ligase (CRL) regulators CAND1 and CAND2 enhance CRL4 complex remodeling and protein degradation. Unlike their varied roles in CRL1, both CAND proteins efficiently mediate CRL4 substrate receptor exchange.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Cullin-RING ligases (CRLs) are crucial for cellular processes, relying on dynamic substrate receptor exchange.
  • CAND1 and CAND2 are known exchange factors for CRL1, but CAND2 shows distinct functional properties.

Purpose of the Study:

  • To investigate the regulatory roles of CAND1 and CAND2 in CRL4 remodeling.
  • To compare the functional efficiencies of CAND1 and CAND2 in CRL4 complexes.

Main Methods:

  • Genetic perturbation studies
  • Real-time kinetic analyses
  • Quantitative interaction proteomics

Main Results:

  • Both CAND1 and CAND2 promote CRL4-mediated protein degradation.
  • Both proteins enhance the dynamic exchange of DDB1·DCAF substrate receptor modules in CRL4.
  • CAND1 and CAND2 exhibit similar kinetic parameters and exchange efficiencies in CRL4, unlike their differential roles in CRL1.

Conclusions:

  • CAND1 and CAND2 function as bona fide CRL4 exchange factors.
  • Biochemical distinctions exist in the regulation of CRL1 versus CRL4 complexes by CAND proteins.
Keywords:
CAND2Cullin-RING ubiquitin ligasesdynamics of protein complexesprotein exchange factor

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