A Phosphorylation Switch Controls the SUMOylation Clock
A new study in the Journal of Cell Biology reveals a precise regulatory mechanism governing the cell cycle-dependent wave of protein polySUMOylation in budding yeast. Researchers demonstrate that the mitotic kinase Cdc5 phosphorylates the SUMO protease Ulp2 at a specific serine residue (S734), which reduces Ulp2’s affinity for SUMO chains and triggers polySUMOylation. This phosphorylation event is counteracted by the phosphatase PP2ARts1, creating a balanced switch that prevents premature modification. The findings establish a direct link between kinase signaling and the timing of a critical post-translational modification essential for cell cycle progression.
Why it might matter to you: This work provides a clear molecular blueprint for how kinase-phosphatase dynamics directly regulate post-translational modification cascades, a core concept in cell signaling. For professionals focused on cell cycle control, it offers a new model for investigating how dysregulation of similar timing mechanisms could contribute to genomic instability or disease. Understanding these precise switches is fundamental for interpreting data from proteomics and live-cell imaging studies aimed at dissecting cellular decision points.
Source →Stay curious. Stay informed — with Science Briefing.
Always double check the original article for accuracy.
