Abstract:
:In contrast to our extensive knowledge on covalent small ubiquitin-like modifier (SUMO) target proteins, we are limited in our understanding of non-covalent SUMO-binding proteins. We identify interactors of different SUMO isoforms-monomeric SUMO1, monomeric SUMO2, or linear trimeric SUMO2 chains-using a mass spectrometry-based proteomics approach. We identify 379 proteins that bind to different SUMO isoforms, mainly in a preferential manner. Interestingly, XRCC4 is the only DNA repair protein in our screen with a preference for SUMO2 trimers over mono-SUMO2, as well as the only protein in our screen that belongs to the non-homologous end joining (NHEJ) DNA double-strand break repair pathway. A SUMO interaction motif (SIM) in XRCC4 regulates its recruitment to sites of DNA damage and phosphorylation of S320 by DNA-PKcs. Our data highlight the importance of non-covalent and covalent sumoylation for DNA double-strand break repair via the NHEJ pathway and provide a resource of SUMO isoform interactors.
journal_name
Cell Repjournal_title
Cell reportsauthors
González-Prieto R,Eifler-Olivi K,Claessens LA,Willemstein E,Xiao Z,Talavera Ormeno CMP,Ovaa H,Ulrich HD,Vertegaal ACOdoi
10.1016/j.celrep.2021.108691subject
Has Abstractpub_date
2021-01-26 00:00:00pages
108691issue
4issn
2211-1247pii
S2211-1247(21)00004-8journal_volume
34pub_type
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