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In Vitro SUMOylation Assay to Study SUMO E3 Ligase Activity
Published on: January 29, 2018
Nitric oxide destabilizes Pias3 and regulates sumoylation
Jing Qu1, Guang-Hui Liu, Kaiyuan Wu
1National Laboratory of Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, and Graduate School of the Chinese Academy of Sciences, Beijing, China.
Plos One
|November 8, 2007
Summary
Nitric oxide (NO) reduces protein SUMOylation by targeting Ubc9 and Pias3. NO-induced S-nitrosation of Pias3 promotes its degradation via interaction with Trim32, revealing a crosstalk between NO signaling and protein modification pathways.
Area of Science:
- Biochemistry
- Molecular Biology
- Cellular Signaling
Background:
- Posttranslational modification regulates protein function.
- Small ubiquitin-related protein modifiers (SUMO) are crucial for protein regulation.
- Regulation of the SUMOylation pathway remains largely uncharacterized.
Purpose of the Study:
- Investigate how nitric oxide (NO) affects the SUMOylation pathway.
- Identify molecular targets of NO in the SUMOylation process.
- Elucidate the crosstalk between NO signaling, S-nitrosation, ubiquitination, and SUMOylation.
Main Methods:
- Mammalian cell culture and treatment with NO donors.
- Analysis of protein S-nitrosation, ubiquitination, and SUMOylation levels.
- Co-immunoprecipitation assays to study protein interactions.
- Site-directed mutagenesis to identify critical residues.
Main Results:
- NO induces global hyposumoylation in mammalian cells.
- Ubc9 and Pias3 are targets of S-nitrosation.
- S-nitrosation of Pias3 promotes its degradation by Trim32.
- Cys459 of Pias3 is essential for NO-mediated regulation of the Pias3-Trim32 interaction.
Conclusions:
- NO signaling intersects with SUMOylation and ubiquitination pathways.
- S-nitrosation of Pias3 at Cys459 is a key regulatory mechanism.
- This crosstalk plays a significant role in NO-related physiological and pathological processes.
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