title: Epidermal growth factor receptor phosphorylates protein kinase C {delta} at Tyr332 to form a trimeric complex with p66Shc in the H2O2-stimulated cells.
abstract: Protein kinase C (PKC) delta is phosphorylated at Tyr311 and Tyr332 and its catalytic activity is enhanced in the H(2)O(2)-stimulated cells, but the enzymes that recognize these tyrosine residues, especially Tyr332, have been remained to be clarified. The analysis of the endogenous proteins in COS-7 cells revealed that PKCdelta binds to p66Shc, an adaptor protein containing two phosphotyrosine-binding domains, in a manner dependent on its tyrosine phosphorylation upon H(2)O(2) stimulation. The studies using the mutated PKCdelta clarified that PKCdelta associates with p66Shc through the phosphorylated Tyr332 residue. Epidermal growth factor (EGF) receptor was detected in the anti-p66Shc immunoprecipitate prepared from the H(2)O(2)-stimulated cells, and this receptor-type tyrosine kinase phosphorylated PKCdelta at Tyr332 in vitro. PKCdelta was, however, not tyrosine phosphorylated in the EGF-stimulated cells, whereas H(2)O(2)-induced tyrosine phosphorylation of PKCdelta and its association with p66Shc were strongly suppressed by EGF receptor kinase inhibitors such as AG1478 and PD153035. These results indicate that EGF receptor phosphorylates PKCdelta at Tyr332 in the H(2)O(2)-stimulated but not in the growth-factor treated cells, and suggest that PKCdelta in the complex with p66Shc and EGF receptor may play a role in the stress-signalling pathway.
authors.affiliation: Biosignal Research Center; and Research Center for Environmental Genomics, Kobe University, Kobe 657-8501, Japan.
authors.forename: Masakatsu
authors.initials: M
authors.lastname: Morita
authors.forename: Hidenori
authors.initials: H
authors.lastname: Matsuzaki
authors.forename: Toshiyoshi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Fukami
authors.forename: Ushio
authors.initials: U
authors.lastname: Kikkawa
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000378:metabolism*; D000818:Animals; D019556:COS Cells; D002522:Chlorocebus aethiops; D066246:ErbB Receptors / Q000378:metabolism*; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D010766:Phosphorylation; D051745:Protein Kinase C-delta / Q000737:chemistry / Q000378:metabolism*; D051381:Rats; D055765:Shc Signaling Adaptor Proteins; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D014443:Tyrosine / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D055765:Shc Signaling Adaptor Proteins; C528035:Shc1 protein, rat; D000071425:Src Homology 2 Domain-Containing, Transforming Protein 1; D014443:Tyrosine; D006861:Hydrogen Peroxide; D066246:ErbB Receptors; D051745:Protein Kinase C-delta