A cytoplasmic protein complex containing glycogen synthase kinase-3-beta (GSK-3-beta), the adenomatous polyposis coli protein (APC), and the scaffolding protein axin, among others; phosphorylates beta-catenin, targets it for degradation by the proteasome.
Source:PMID:14600025
Comment
Note that the gene/protein name 'APC' should not be confused with the abbreviation for 'anaphase promoting complex'.