System-wide identification of wild-type SUMO-2 conjugation sites.
System-wide identification of wild-type SUMO-2 conjugation sites.
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DOI:
10.1038/ncomms8289
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发表时间:
2015-06-15
影响因子:
16.6
通讯作者:
Vertegaal, Alfred C. O.
中科院分区:
文献类型:
--
作者:
Hendriks, Ivo A.;D'Souza, Rochelle C.;Chang, Jer-Gung;Mann, Matthias;Vertegaal, Alfred C. O.
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. Tryptic digestion of SUMOylated proteins generates large peptides, rendering proteomic characterisation of this post-translational modification particularly challenging unless mutant SUMO is used. Hendriks et al. present a method that allows the quantitative identification of wild-type SUMO sites.
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