The Addition of Bisecting N-Acetylglucosamine Residues to E-cadherin Down-regulates the Tyrosine Phosphorylation of β-Catenin*

T. Kitada,E. Miyoshi,K. Noda,S. Higashiyama,H. Ihara,N. Matsuura,N. Hayashi,S. Kawata,Y. Matsuzawa,Naoyuki Taniguchi

Published 2001 in Journal of Biological Chemistry

ABSTRACT

The enzyme GnT-III (β1,4-N-acetylglucosaminyltransferase III) catalyzes the addition of a bisecting N-acetylglucosamine (GlcNAc) residue on glycoproteins. Our previous study described that the transfection of GnT-lll into mouse melanoma cells results in the enhanced expression of E-cadherin, which in turn leads to the suppression of lung metastasis. It has recently been proposed that the phosphorylation of a tyrosine residue of β-catenin is associated with cell migration. The present study reports on the importance of bisecting GlcNAc residues by GnT-lll on tyrosine phosphorylation of β-catenin using three types of cancer cell lines. An addition of bisecting GlcNAc residues to E-cadherin leads to an alteration in cell morphology and the localization of β-catenin after epidermal growth factor stimulation. These changes are the result of a down-regulation in the tyrosine phosphorylation of β-catenin. In addition, tyrosine phosphorylation of β-catenin by transfection of constitutively active c-src was suppressed in GnT-III transfectants as well as in the case of epidermal growth factor stimulation. Treatment with tunicamycin abolished any differences in β-catenin phosphorylation for the mockvis à vis the GnT-lll transfectants. Thus, the addition of a specific N-glycan structure, the bisecting GlcNAc to E-cadherin-β-catenin complex, down-regulates the intracellular signaling pathway, suggesting its implication in cell motility and the suppression of cancer metastasis.

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