The SLX4 complex is a SUMO E3 ligase that impacts on replication stress outcome and genome stability.

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 interstrand 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.
Mesh Terms:
Amino Acid Sequence, Cell Line, Tumor, DNA Repair, DNA Replication, DNA-Binding Proteins, Gene Expression Regulation, Genome, Genomic Instability, Humans, Molecular Sequence Data, Protein Binding, Protein Interaction Domains and Motifs, Protein Subunits, Recombinant Fusion Proteins, Recombinases, Sequence Alignment, Signal Transduction, Small Ubiquitin-Related Modifier Proteins, Sumoylation, Ubiquitin-Conjugating Enzymes, Ubiquitin-Protein Ligases
Mol. Cell
Date: Jan. 08, 2015
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