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Journal Article

Phosphorylation of SUMO-1 occurs in vivo and is conserved through evolution


Matić,  I.
Matic – ADP-ribosylation in DNA Repair and Ageing, Research Groups, Max Planck Institute for Biology of Ageing, Max Planck Society;

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Matić, I., Macek, B., Hilger, M., Walther, T. C., & Mann, M. (2008). Phosphorylation of SUMO-1 occurs in vivo and is conserved through evolution. J Proteome Res, 7(9), 4050-7. doi:10.1021/pr800368m.

Cite as: https://hdl.handle.net/21.11116/0000-000B-811D-3
Protein dynamics is regulated by an elaborate interplay between different post-translational modifications. Ubiquitin and ubiquitin-like proteins (Ubls) are small proteins that are covalently conjugated to target proteins with important functional consequences. One such modifier is SUMO, which mainly modifies nuclear proteins. SUMO contains a unique N-terminal arm not present in ubiquitin and other Ubls, which functions in the formation of SUMO polymers. Here, we unambiguously show that serine 2 of the endogenous SUMO-1 N-terminal protrusion is phosphorylated in vivo using very high mass accuracy mass spectrometry at both the MS and the MS/MS level and complementary fragmentation techniques. Strikingly, we detected the same phosphorylation in yeast, Drosophila and human cells, suggesting an evolutionary conserved function for this modification. The nearly identical human SUMO-2 and SUMO-3 isoforms differ in serine 2; thus, only SUMO-3 could be phosphorylated at this position. Our finding that SUMO can be modified may point to an additional level of complexity through modifying a protein-modifier.