Beta-Catenin (Tyr-142)[gamma-Catenin (Tyr-133)], phospho-specific polyclonal, anti-human, mouse, rat

Background:
β-Catenin is a 92 kDa protein that binds to the cytoplasmic tail of E-Cadherin. The cadherins, transmembrane adhesion molecules, are found with catenins at adherens junctions. Deletions in the cytoplasmic domain of E-Cadherin eliminate catenin binding and result in a loss of cell adhesion. Tyrosine phosphorylation of β-Catenin can regulate its interaction with critical components of adherens junctions. Both Fer and Fyn kinases phosphorylate tyrosine 142 in vitro. Overexpression of these kinases in epithelial cells disrupts interactions between α- and β-Catenins. The phosphorylation of tyrosine 142 may act as a switch from the transcriptional to the adhesive role of β-Catenin. Src family kinases can also phosphorylate tyrosine 654 in the C-terminal armadillo repeat of β-Catenin. This phosphorylation regulates β-Catenin binding to E-cadherin. Thus, site-specific tyrosine phosphorylation of β-Catenin may regulate specific protein-protein interactions leading to changes in cell adhesion.

Immunogen: Phospho-β-Catenin (Tyr-142) synthetic peptide (coupled to KLH) corresponding to amino acid residues around tyrosine 142 of human β-Catenin. This peptide sequence has one amino acid difference from a sequence around tyrosine 133 of human γ-Catenin. These human sequences are highly conserved in rat and mouse β- and γ-Catenins.

Specificity: This antibody was cross-adsorbed to phospho-tyrosine coupled to agarose before affinity purification using phospho-β-Catenin (Tyr-142) peptide (without carrier). The antibody detects a 92kDa* protein corresponding to the molecular mass of β-Catenin on SDS-PAGE immunoblots of Hct116 src-transformed cells treated with pervanadate, but not in control cells. Similar results were observed in pervanadate-treated A431 and human endothelial cells.

Buffer/Storage:
Rabbit polyclonal, affinity-purified antibody is supplied in 100µl phosphate-buffered saline, 50% glycerol, 1 mg/ml BSA, and 0.05% sodium azide. Store at –20°C. Stable for 1 year.