Phosphorylation-driven Targeted Protein Degradation of Oncogenic β-catenin
Wolf, L. M.; Poirson, J.; Macleod, G.; Lin, S.; Kim, Y. H.; Almeida, M. P.; Taipale, M.; Angers, S.
Show abstract
Therapeutic strategies to inhibit the Wnt signalling pathway for cancer treatment have, so far, failed to advance to the clinic. Induced-proximity drugs are revolutionizing our ability to tackle targets previously considered undruggable. Here, we used an unbiased genome-scale approach to identify induced-proximity protein candidates that inhibit the central Wnt signalling effector {beta}-catenin in colorectal cancer cells. While the identification of several E3 ubiquitin ligases validated our approach, we uncovered that inducing proximity to members of the Casein kinase I (CSNK1) family leads to {beta}-catenin degradation and inhibits the growth of colorectal cancer cells harbouring Wnt pathway mutations. We show that {beta}-catenin degradation induced by CSNK1 proximity is kinase activity- and proteasome-dependent. We propose that the formation of a neo-degron, through kinase recruitment, can expand induced-proximity drug targeting strategies.
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