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System-wide identification of wild-type SUMO-2 conjugation sites

Author

Listed:
  • Ivo A. Hendriks

    (Leiden University Medical Center)

  • Rochelle C. D’Souza

    (Max Planck Institute for Biochemistry)

  • Jer-Gung Chang

    (Leiden University Medical Center)

  • Matthias Mann

    (Max Planck Institute for Biochemistry)

  • Alfred C. O. Vertegaal

    (Leiden University Medical Center)

Abstract

SUMOylation is a reversible post-translational modification (PTM) regulating all nuclear processes. Identification of SUMOylation sites by mass spectrometry (MS) has been hampered by bulky tryptic fragments, which thus far necessitated the use of mutated SUMO. Here we present a SUMO-specific protease-based methodology which circumvents this problem, dubbed Protease-Reliant Identification of SUMO Modification (PRISM). PRISM allows for detection of SUMOylated proteins as well as identification of specific sites of SUMOylation while using wild-type SUMO. The method is generic and could be widely applied to study lysine PTMs. We employ PRISM in combination with high-resolution MS to identify SUMOylation sites from HeLa cells under standard growth conditions and in response to heat shock. We identified 751 wild-type SUMOylation sites on endogenous proteins, including 200 dynamic SUMO sites in response to heat shock. Thus, we have developed a method capable of quantitatively studying wild-type mammalian SUMO at the site-specific and system-wide level.

Suggested Citation

  • Ivo A. Hendriks & Rochelle C. D’Souza & Jer-Gung Chang & Matthias Mann & Alfred C. O. Vertegaal, 2015. "System-wide identification of wild-type SUMO-2 conjugation sites," Nature Communications, Nature, vol. 6(1), pages 1-16, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8289
    DOI: 10.1038/ncomms8289
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