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Protocol for SUMOylome analysis using a SUMO-T86K mutant combined with Lys-C digestion
Yaning Wu1, Rin Imai1, Hidetaka Kosako2
1Department of Molecular Biology, Keio University School of Medicine, Tokyo, Japan.
STAR Protocols
|April 19, 2026
Summary
This study introduces a novel method for identifying small ubiquitin-like modifier (SUMO) modifications. The new protocol uses a SUMO-T86K mutant and Lys-C digestion, improving accuracy in SUMOylation site detection.
Area of Science:
- Biochemistry
- Molecular Biology
- Proteomics
Background:
- Small ubiquitin-like modifier (SUMO) modification, or SUMOylation, is a crucial post-translational modification regulating various cellular processes.
- Existing methods, such as those using trypsin digestion with SUMO-T86R mutants, face limitations due to indistinguishable diglycine remnants.
Purpose of the Study:
- To present a refined protocol for identifying SUMOylated proteins and specific modification sites.
- To overcome the limitations of previous SUMOylation detection methods.
Main Methods:
- Utilized a SUMO-T86K (Thr86→Lys) mutant.
- Employed Lys-C digestion for peptide cleavage.
- Incorporated enrichment of modified peptides.
- Applied mass spectrometry for identification.
Main Results:
- Successfully identified SUMOylated proteins and modification sites using the novel protocol.
- The SUMO-T86K mutant and Lys-C digestion strategy effectively distinguished SUMOylation from other modifications like ubiquitination.
Conclusions:
- The developed protocol offers a more accurate and reliable method for SUMOylation site analysis.
- This advancement facilitates deeper understanding of SUMOylation's role in cellular functions.
