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. 1991 Mar 15;88(6):2520–2524. doi: 10.1073/pnas.88.6.2520

Epidermal growth factor (EGF) receptor T669 peptide kinase from 3T3-L1 cells is an EGF-stimulated "MAP" kinase.

K Takishima 1, I Griswold-Prenner 1, T Ingebritsen 1, M R Rosner 1
PMCID: PMC51264  PMID: 1848706

Abstract

The epidermal growth factor (EGF) receptor is both an activator and a target of growth factor-stimulated kinases involved in cellular signaling. Threonine-669 (T669) of the EGF receptor is phosphorylated in response to a wide variety of growth-modulating agents. MAP kinase is similarly phosphorylated as well as stimulated by growth activators, including EGF. To determine whether a MAP-type kinase is responsible for T669 kinase activity in EGF-stimulated 3T3-L1 cells, we partially purified and characterized the T669 peptide kinase. The results indicate that a MAP kinase phosphorylates the T669 peptide and raise the possibility that this enzyme may participate in a feedback loop, being activated by the EGF receptor and in turn phosphorylating the receptor.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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