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  • Title: Axin directly interacts with plakoglobin and regulates its stability.
    Author: Kodama S, Ikeda S, Asahara T, Kishida M, Kikuchi A.
    Journal: J Biol Chem; 1999 Sep 24; 274(39):27682-8. PubMed ID: 10488109.
    Abstract:
    Plakoglobin is homologous to beta-catenin. Axin, a Wnt signal negative regulator, enhances glycogen synthase kinase (GSK)-3beta-dependent phosphorylation of beta-catenin and stimulates the degradation of beta-catenin. Therefore, we examined the effect of Axin on plakoglobin stability. Axin formed a complex with plakoglobin in COS cells and SW480 cells. Axin directly bound to plakoglobin, and this binding was inhibited by beta-catenin. Axin promoted GSK-3beta-dependent phosphorylation of plakoglobin. Furthermore, overexpression of Axin down-regulated the level of plakoglobin in SW480 cells. These results suggest that Axin regulates the stability of plakoglobin by enhancing its phosphorylation by GSK-3beta and that Axin may act on beta-catenin and plakoglobin in similar manners.
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