PMID: 9531566May 16, 1998Paper

Dynamic interaction of PTPmu with multiple cadherins in vivo

The Journal of Cell Biology
Susann M Brady-KalnayN K Tonks

Abstract

There is a growing body of evidence to implicate reversible tyrosine phosphorylation as an important mechanism in the control of the adhesive function of cadherins. We previously demonstrated that the receptor protein tyrosine phosphatase PTPmu associates with the cadherin-catenin complex in various tissues and cells and, therefore, may be a component of such a regulatory mechanism (Brady-Kalnay, S. M., D.L. Rimm, and N.K. Tonks. 1995. J. Cell Biol. 130:977- 986). In this study, we present further characterization of this interaction using a variety of systems. We observed that PTPmu interacted with N-cadherin, E-cadherin, and cadherin-4 (also called R-cadherin) in extracts of rat lung. We observed a direct interaction between PTPmu and E-cadherin after coexpression in Sf9 cells. In WC5 cells, which express a temperature-sensitive mutant form of v-Src, the complex between PTPmu and E-cadherin was dynamic, and conditions that resulted in tyrosine phosphorylation of E-cadherin were associated with dissociation of PTPmu from the complex. Furthermore, we have demonstrated that the COOH-terminal 38 residues of the cytoplasmic segment of E-cadherin was required for association with PTPmu in WC5 cells. Zondag et al. (Zondag, G., W. Mo...Continue Reading

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