Inhibition of Wnt Signaling Pathway by a Novel Axin-binding Protein*

Takayuki Kadoya,S. Kishida,A. Fukui,T. Hinoi,T. Michiue,M. Asashima,A. Kikuchi

Published 2000 in Journal of Biological Chemistry

ABSTRACT

Axin forms a complex with adenomatous polyposis coli gene product, glycogen synthase kinase-3β (GSK-3β), β-catenin, Dvl, and protein phosphatase 2A and functions as a scaffold protein in the Wnt signaling pathway. In the Axin complex, GSK-3β efficiently phosphorylates β-catenin, which is then ubiquitinated and degraded by proteasome. We isolated a novel protein that binds to Axin and named it Axam (for Axinassociating molecule). Axam formed a complex with Axin in intact cells and bound directly to Axin. Axam inhibited the complex formation of Dvl with Axin and the activity of Dvl to suppress GSK-3β-dependent phosphorylation of Axin. Furthermore, Axam induced the degradation of β-catenin in SW480 cells and inhibited Wnt-dependent axis duplication inXenopus embryos. These results suggest that Axam regulates the Wnt signaling pathway negatively by inhibiting the binding of Dvl to Axin.

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