Related Experiment Video
Updated: Jun 7, 2026
09:45
In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity
Published on: January 29, 2018
SUMO E3 ligase activity of TRIM proteins
1Department of Cancer Biology and Abramson Family Cancer Research Institute, University of Pennsylvania School of Medicine, Philadelphia, PA 19096, USA.
Oncogene
|October 26, 2010
Summary
Tripartite motif (TRIM) proteins function as small ubiquitin-like modifier (SUMO) protein ligases (E3s), enhancing SUMOylation of substrates like p53. This discovery expands the known SUMO E3 landscape and TRIM protein functions.
Area of Science:
- Cellular Biology
- Molecular Biology
- Biochemistry
Background:
- SUMOylation is a crucial post-translational modification regulating diverse cellular processes in eukaryotes.
- The identification of SUMOylation E3 enzymes has been limited, hindering a full understanding of the SUMOylation pathway.
Purpose of the Study:
- To investigate the potential role of the tripartite motif (TRIM) superfamily in SUMOylation.
- To identify novel SUMO E3 ligases within the TRIM protein family.
Main Methods:
- Biochemical assays to assess TRIM protein binding to Ubc9 and SUMOylation substrates.
- In vitro SUMOylation assays to measure the E3 ligase activity of TRIM proteins.
- Identification of TRIM E3 ligase substrates, including p53 and Mdm2.
Main Results:
- Members of the TRIM superfamily function as SUMO E3 ligases.
- TRIM proteins bind both Ubc9 and SUMOylation substrates, enhancing SUMO transfer.
- The TRIM motif is essential for E3 activity, suggesting it as a widespread SUMO E3 motif.
- TRIM E3s target key substrates such as tumor suppressor p53 and its antagonist Mdm2.
Conclusions:
- The TRIM superfamily represents a significant source of novel SUMO E3 ligases.
- TRIM E3 activity contributes to SUMOylation specificity and the functional diversity of TRIM proteins.
- This finding expands the known repertoire of SUMO E3s and offers new insights into TRIM protein biology.
