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Updated: Dec 25, 2025

In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity
Published on: January 29, 2018
RNF4-mediated SUMO-targeted ubiquitination relieves PARIS/ZNF746-mediated transcriptional repression
Tamotsu Nishida1, Yoshiji Yamada1
1Department of Human Functional Genomics, Advanced Science Research Promotion Center, Organization for the Promotion of Regional Innovation (OPRI), Mie University, 1577 Kurima-machiya, Tsu, 514-8507, Japan.
Abstract:
The transcriptional repressor PARIS, which is a substrate of the ubiquitin E3 ligase parkin, represses the expression of the transcriptional co-activator, PGC-1α. However, little is known about how its repression activity is regulated. We have previously shown that PARIS is SUMOylated, and this SUMOylation plays an important role in regulating its transcriptional repression activity. In this study, we demonstrated that PARIS SUMOylation induced its ubiquitination and subsequent proteasomal degradation, which was mediated by the SUMO-targeted ubiquitin ligase RNF4. Reporter gene assays revealed that co-expression of SUMO3 and RNF4 relieved PARIS-mediated transcriptional repression. Conversely, the SUMO E3 ligase PIASy inhibited the RNF4-mediated ubiquitination of PARIS and blocked the RNF4-mediated relief of PARIS-mediated transcriptional repression. These results suggest that RNF4 regulates PARIS ubiquitination to control its transcriptional repression activity.
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