The 120 kD catenin-related protein p120ctn (also known as catenin p120ctn, p120cas and pp120 src substrate), was originally described as a prominent substrate for the sarcoma (Src) oncoprotein and for a variety of receptor tyrosine kinases (RTKs) including those for epidermal growth factor (EGF), platelet derived growth factor (PDGF), and colony stimulating factor-1 (CSF1). Like β-catenin and plakoglobin, it binds directly to the cytoplasmic domain of epithelial (E)-cadherin via the ARM domain and co-precipitates in multiprotein complexes containing E-cadherin or other cadherins such as neural (N)- or placental (P)- cadherins, depending on the cell type. However, unlike β-catenin and plakoglobin, p120ctn does not appear to bind α-catenin.
