NCIt definition : Junction plakoglobin (744 aa, 82 kDa) is encoded by the human JUP gene. This protein
is involved in adherens junction assembly.;
NCIt note : Plakoglobin (gamma-Catenin) is a major soluble and membrane-associated cytoplasmic
protein common to desmosomes and intermediate junctions. It associates with the cytoplasmic
region of Desmoglein I and mediates the connection of cadherins to actin filaments
and to other transmembrane and peripheral cytoplasmic proteins in epithelial adherens
junctions. The cadherin-catenin complex interacts with EGFR; beta-Catenin and Plakoglobin
are tyrosine phosphorylated by activated EGFR. APC binds to and regulates beta- and
gamma-Catenin. Homologues of Drosophila armadillo, beta-Catenin and gamma-Catenin
have analogous structures and functions in cell adhesion and the WNT signaling pathway.
Several mutations of gamma-Catenin have transforming activity dependent on TCF/LEF
and c-MYC function. Beta- and gamma-Catenin may have distinct roles in WNT signaling
via differential effects on downstream target genes.;