Catenin beta-1 (CTNNB1)

Key downstream component of the canonical Wnt signaling pathway. In the absence of Wnt, forms a complex with AXIN1, AXIN2, APC, CSNK1A1 and GSK3B that promotes phosphorylation on N-terminal Ser and Thr residues and ubiquitination of CTNNB1 through BTRC and its subsequent degradation by the proteasome.

In the presence of Wnt ligand, CTNNB1 is not ubiquitinated and accumulates in the nucleus, where it functions as a coactivator for transcription factors of the TCF/LEF family, leading to activate Wnt responsive genes. Involved in the regulation of cell adhesion, as component of an E- cadherin:catenin adhesion complex.