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Published on: November 1, 2019
Identification of SUMO target proteins by quantitative proteomics
Jens S Andersen1, Ivan Matic, Alfred C O Vertegaal
1Center for Experimental Bioinformatics (CEBI), Department of Biochemistry, University of Southern Denmark, Odense, Denmark.
Methods in Molecular Biology (Clifton, N.J.)
|December 25, 2008
Summary
Identifying small ubiquitin-like modifier (SUMO) target proteins is crucial for understanding SUMO functions. Quantitative proteomics using SILAC effectively identifies SUMO targets and studies sumoylation dynamics.
Area of Science:
- Molecular Biology
- Proteomics
- Cellular Biology
Background:
- Identifying target proteins for small ubiquitin-like modifiers (SUMOs) is essential for understanding their cellular roles.
- Challenges in SUMO target identification include low target abundance, limited sumoylation of targets, and high deconjugating enzyme activity.
Purpose of the Study:
- To describe methodological details for identifying SUMO target proteins using stable isotope labeling of amino acids in cell culture (SILAC).
- To enable the study of sumoylation dynamics in response to various stimuli.
Main Methods:
- Utilizing quantitative proteomics, specifically SILAC, for SUMO target protein identification.
- Applying SILAC to distinguish true SUMO targets from contaminating proteins in enriched preparations.
Main Results:
- SILAC provides a robust method for identifying SUMO target proteins.
- This approach allows for the analysis of both steady-state sumoylation and dynamic changes in the sumoylated proteome.
Conclusions:
- Quantitative proteomics, particularly SILAC, is a powerful tool to overcome challenges in identifying SUMO targets.
- SILAC facilitates a deeper understanding of SUMO functions and dynamics within the cell.
