The β-catenin destruction complex is a cytoplasmic protein complex that phosphorylates β-catenin, targeting it for ubiquitin-mediated proteolysis. In the absence of Wnt signaling, the β-catenin destruction complex constitutively suppresses the canonical Wnt signaling pathway by preventing the accumulation of cytoplasmic β-catenin (arm). (Adapted from FBrf0217546).