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Suppression of protein tyrosine kinase activity of the epidermal growth factor receptor by epidermal growth factor


Suppression of protein tyrosine kinase activity of the epidermal growth factor receptor by epidermal growth factor



Journal of Biological Chemistry 261(18): 8295-8297



ISSN/ISBN: 0021-9258

PMID: 3013845

Epidermal growth factor (EGF) receptor protein kinase activity, estimated by the use of peptide substrates, was reduced by as much as 70% after the treatment of intact A431 human carcinoma cells with EGF. The apparent decrease in protein kinase activity was observed after immunoprecipitation of the receptor or after purification of the receptor by lectin chromatography. By the use of [35S]methionine, it was determined that the total amount of receptor obtained was the same whether or not cells were treated with EGF. EGF stimulated the purified receptor protein kinase activity in vitro; however, the EGF-stimulated activity of receptor from EGF-treated cells continued to be reduced by as much at 70% compared to the EGF-stimulated activity from untreated cells. The reduction in receptor protein kinase activity induced by EGF may represent a feedback mechanism by which responsiveness to the growth factor is regulated.

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Accession: 006544959

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