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Dynamic Interaction of PTPμ with Multiple Cadherins In Vivo

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 PTPμ associates with the cadherin–catenin complex in various...

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Autores principales: Brady-Kalnay, Susann M., Mourton, Tracy, Nixon, Joseph P., Pietz, Gregory E., Kinch, Michael, Chen, Haiyan, Brackenbury, Robert, Rimm, David L., Del Vecchio, Robert L., Tonks, Nicholas K.
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1998
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2132733/
https://www.ncbi.nlm.nih.gov/pubmed/9531566
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author Brady-Kalnay, Susann M.
Mourton, Tracy
Nixon, Joseph P.
Pietz, Gregory E.
Kinch, Michael
Chen, Haiyan
Brackenbury, Robert
Rimm, David L.
Del Vecchio, Robert L.
Tonks, Nicholas K.
author_facet Brady-Kalnay, Susann M.
Mourton, Tracy
Nixon, Joseph P.
Pietz, Gregory E.
Kinch, Michael
Chen, Haiyan
Brackenbury, Robert
Rimm, David L.
Del Vecchio, Robert L.
Tonks, Nicholas K.
author_sort Brady-Kalnay, Susann M.
collection PubMed
description 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 PTPμ 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 PTPμ interacted with N-cadherin, E-cadherin, and cadherin-4 (also called R-cadherin) in extracts of rat lung. We observed a direct interaction between PTPμ and E-cadherin after coexpression in Sf9 cells. In WC5 cells, which express a temperature-sensitive mutant form of v-Src, the complex between PTPμ and E-cadherin was dynamic, and conditions that resulted in tyrosine phosphorylation of E-cadherin were associated with dissociation of PTPμ 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 PTPμ in WC5 cells. Zondag et al. (Zondag, G., W. Moolenaar, and M. Gebbink. 1996. J. Cell Biol. 134: 1513–1517) have asserted that the association we observed between PTPμ and the cadherin–catenin complex in immunoprecipitates of the phosphatase arises from nonspecific cross-reactivity between BK2, our antibody to PTPμ, and cadherins. In this study we have confirmed our initial observation and demonstrated the presence of cadherin in immunoprecipitates of PTPμ obtained with three antibodies that recognize distinct epitopes in the phosphatase. In addition, we have demonstrated directly that the anti-PTPμ antibody BK2 that we used initially did not cross-react with cadherin. Our data reinforce the observation of an interaction between PTPμ and E-cadherin in vitro and in vivo, further emphasizing the potential importance of reversible tyrosine phosphorylation in regulating cadherin function.
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spelling pubmed-21327332008-05-01 Dynamic Interaction of PTPμ with Multiple Cadherins In Vivo Brady-Kalnay, Susann M. Mourton, Tracy Nixon, Joseph P. Pietz, Gregory E. Kinch, Michael Chen, Haiyan Brackenbury, Robert Rimm, David L. Del Vecchio, Robert L. Tonks, Nicholas K. J Cell Biol Regular Articles 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 PTPμ 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 PTPμ interacted with N-cadherin, E-cadherin, and cadherin-4 (also called R-cadherin) in extracts of rat lung. We observed a direct interaction between PTPμ and E-cadherin after coexpression in Sf9 cells. In WC5 cells, which express a temperature-sensitive mutant form of v-Src, the complex between PTPμ and E-cadherin was dynamic, and conditions that resulted in tyrosine phosphorylation of E-cadherin were associated with dissociation of PTPμ 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 PTPμ in WC5 cells. Zondag et al. (Zondag, G., W. Moolenaar, and M. Gebbink. 1996. J. Cell Biol. 134: 1513–1517) have asserted that the association we observed between PTPμ and the cadherin–catenin complex in immunoprecipitates of the phosphatase arises from nonspecific cross-reactivity between BK2, our antibody to PTPμ, and cadherins. In this study we have confirmed our initial observation and demonstrated the presence of cadherin in immunoprecipitates of PTPμ obtained with three antibodies that recognize distinct epitopes in the phosphatase. In addition, we have demonstrated directly that the anti-PTPμ antibody BK2 that we used initially did not cross-react with cadherin. Our data reinforce the observation of an interaction between PTPμ and E-cadherin in vitro and in vivo, further emphasizing the potential importance of reversible tyrosine phosphorylation in regulating cadherin function. The Rockefeller University Press 1998-04-06 /pmc/articles/PMC2132733/ /pubmed/9531566 Text en This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Regular Articles
Brady-Kalnay, Susann M.
Mourton, Tracy
Nixon, Joseph P.
Pietz, Gregory E.
Kinch, Michael
Chen, Haiyan
Brackenbury, Robert
Rimm, David L.
Del Vecchio, Robert L.
Tonks, Nicholas K.
Dynamic Interaction of PTPμ with Multiple Cadherins In Vivo
title Dynamic Interaction of PTPμ with Multiple Cadherins In Vivo
title_full Dynamic Interaction of PTPμ with Multiple Cadherins In Vivo
title_fullStr Dynamic Interaction of PTPμ with Multiple Cadherins In Vivo
title_full_unstemmed Dynamic Interaction of PTPμ with Multiple Cadherins In Vivo
title_short Dynamic Interaction of PTPμ with Multiple Cadherins In Vivo
title_sort dynamic interaction of ptpμ with multiple cadherins in vivo
topic Regular Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2132733/
https://www.ncbi.nlm.nih.gov/pubmed/9531566
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