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Journal of Cell Science, Vol 111, Issue 5 607-614, Copyright © 1998 by Company of Biologists
JOURNAL ARTICLES |
R Hooshmand-Rad, K Yokote, CH Heldin and L Claesson-Welsh
Ludwig Institute for Cancer Research, Box 595, Biomedical Center, S-751 24 Uppsala, Sweden.
Two novel autophosphorylation sites in the juxtamembrane region of the PDGF alpha-receptor, Tyr-572 and Tyr-574, were identified. A Y572/574F mutant PDGF (alpha)-receptor was generated and stably expressed in porcine aortic endothelial cells. In contrast to the wild-type receptor, the mutant receptor was unable to associate with or activate Src family tyrosine kinases. Tyrosine phosphorylated synthetic peptides representing the juxtamembrane sequence of the receptor dose-dependently inhibited the binding of Src family tyrosine kinases to the autophosphorylated PDGF alpha-receptor. The mutant receptor showed similar PDGF-induced kinase activity and ability to mediate mitogenicity, actin reorganization and chemotaxis as the wild-type receptor. Thus activation of Src family kinases by the PDGF alpha-receptor is not essential for PDGF-induced mitogenicity or actin reorganization.
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