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J Biol Chem, Vol. 273, Issue 27, 17186-17191, July 3, 1998

Phosphorylation of CrkII Adaptor Protein at Tyrosine 221 by Epidermal Growth Factor Receptor

Yuko Hashimoto, Haruko Katayama, Etsuko Kiyokawa, Satoshi Ota, Takeshi Kurata, Noriko Gotoh^§, Naomi Otsuka^¶, Masao Shibata, and Michiyuki Matsuda^¶

From the  Department of Pathology, National Institute of Infectious Diseases, Shinjuku-ku, Tokyo 162, the ^§ Department of Genetics, Institute of Medical Science, the University of Tokyo, Minato-ku, Tokyo 182, the  Medical and Biological Laboratories, Ina-shi, Nagano 396, and the ^¶ Department of Pathology, Research Institute, International Medical Center of Japan, 1-21-1 Toyama, Shinjuku-ku, Tokyo 162-8655, Japan

CrkII adaptor protein becomes tyrosine-phosphorylated upon various types of stimulation. We examined whether tyrosine 221, which has been shown to be phosphorylated by c-Abl, was phosphorylated also by other tyrosine kinases, such as epidermal growth factor (EGF) receptor. For this purpose, we developed an antibody that specifically recognizes Tyr²²¹-phosphorylated CrkII, and we demonstrated that CrkII was phosphorylated on Tyr²²¹ upon EGF stimulation. When NRK cells were stimulated with EGF, the tyrosine-phosphorylated CrkII was detected at the periphery of the cells, where ruffling is prominent, suggesting that signaling to CrkII may be involved in EGF-dependent cytoskeletal reorganization. The EGF-dependent phosphorylation of CrkII was also detected in a c-Abl-deficient cell line. Moreover, recombinant CrkII protein was phosphorylated in vitro by EGF receptor. These results strongly suggest that EGF receptor directly phosphorylates CrkII. Mutational analysis revealed that the src homology 2 domain was essential for the phosphorylation of CrkII by EGF receptor but not by c-Abl, arguing that these kinases phosphorylate CrkII by different phosphorylation mechanisms. Finally, we found that the CrkII protein phosphorylated upon EGF stimulation did not bind to the phosphotyrosine-containing peptide and that CrkII initiated dissociation from EGF receptor within 3 min even with the sustained tyrosine phosphorylation of EGF receptor. This result implicated phosphorylation of Tyr²²¹ in the negative regulation of the src homology 2-mediated binding of CrkII to EGF receptor.

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