Journal
MOLECULAR CELL
Volume 57, Issue 1, Pages 123-137Publisher
CELL PRESS
DOI: 10.1016/j.molcel.2014.11.014
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Funding
- La Ligue Contre le Cancer
- SIRIC INCa-DGOS-INSERM [6043]
- ARC
- French government
- [INCa PLBIO 2012-111]
- [Teloloop ANR-1582-30020690]
- [ARC-SF1582]
- [FRM ING 2009 1218198]
- [SIRIC INCa-DGOS-Inserm 6038s]
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The SLX4 Fanconi anemia protein is a tumor suppressor that may act as a key regulator that engages the cell into specific genome maintenance pathways. Here, we show that the SLX4 complex is a SUMO E3 ligase that SUMOylates SLX4 itself and the XPF subunit of the DNA repair/recombination XPF-ERCC1 endonuclease. This SLX4-dependent activity is mediated by a remarkably specific interaction between SLX4 and the SUMO-charged E2 conjugating enzyme UBC9 and relies not only on newly identified SUMO-interacting motifs (SIMs) in SLX4 but also on its BTB domain. In contrast to its ubiquitin-binding UBZ4 motifs, SLX4 SIMs are dispensable for its DNA inter-strand crosslink repair functions. Instead, while detrimental in response to global replication stress, the SUMO E3 ligase activity of the SLX4 complex is critical to prevent mitotic catastrophe following common fragile site expression.
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