SUMO: a regulator of gene expression and genome integrity

Post-translational modification with the ubiquitin-like SUMO protein is involved in the regulation of many cellular key processes. The SUMO system modulates signal transduction pathways, including cytokine, Wnt, growth factor and steroid hormone signalling. SUMO frequently restrains the activity of downstream transcription factors in these pathways presumably by facilitating the recruitment of corepressors or mediating the assembly of repressor complexes. Additionally, evidence is accumulating that SUMO controls pathways important for the surveillance of genome integrity. SUMO regulates the PML/p53 tumour suppressor network, a key determinant in the cellular response to DNA damage. Moreover, proteins that maintain genomic stability by functioning at the interface between DNA replication, recombination and repair processes undergo SUMOylation. We will discuss some key findings that exemplify the role of SUMO in transcriptional regulation and genome surveillance.

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