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Updated: Jul 5, 2026
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Functional Characterization of RING-Type E3 Ubiquitin Ligases In Vitro and In Planta
Published on: December 5, 2019
Regulation of cullin RING ligases
1Section of Molecular and Cellular Biology, University of California, Davis, California 95616, USA. skhotton@ucdavis.edu
Annual Review of Plant Biology
|May 1, 2008
Summary
Cullin RING ligases (CRLs) control plant development and responses. Their activity is regulated by RUBylation and derubylation, crucial processes involving RUB and the COP9 signalosome (CSN).
Area of Science:
- Plant molecular biology
- Ubiquitin-proteasome system
- Protein modification
Background:
- The ubiquitin/26S proteasome pathway is vital for selective protein degradation.
- Cullin RING ligases (CRLs) are key E3 ubiquitin ligases in plants, regulating development and environmental responses.
- CRL activity is modulated by RUBylation and derubylation, involving RUB and the COP9 signalosome (CSN).
Purpose of the Study:
- To elucidate the pathways, regulation, and biological functions of CRL rubylation and derubylation.
- To highlight the role of CULLIN-ASSOCIATED NEDD8-DISSOCIATED 1 (CAND1) in CRL modification.
- To identify future research directions and outstanding questions in CRL regulation.
Main Methods:
- Review of existing literature on the ubiquitin/26S proteasome pathway.
- Analysis of CRL structure and function.
- Investigation of RUBylation and derubylation mechanisms.
Main Results:
- CRL activity is tightly regulated by the addition (rubylation) and removal (derubylation) of RUB, a ubiquitin-like modifier.
- The COP9 signalosome (CSN) complex is essential for derubylation, counteracting rubylation.
- CAND1 interacts with CRLs and influences both rubylation and derubylation processes.
Conclusions:
- Rubylation and derubylation are critical regulatory mechanisms for CRLs in plants.
- Understanding these modifications is essential for comprehending plant hormonal signaling, development, and environmental adaptation.
- Further research is needed to fully understand the intricate regulation and biological significance of CRL rubylation and derubylation.
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