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Regulation of kinase and intermolecular bonding in intact and truncated epidermal growth factor receptor

, : Regulation of kinase and intermolecular bonding in intact and truncated epidermal growth factor receptor. Journal of Biological Chemistry 261(27): 12879-12882

Tyrosine kinase activity of the epidermal growth factor (EGF) receptor can be regulated by its state of association. Studies done with the purified receptor solubilized in Triton X-100 indicate that dimer formation results in negative regulation of kinase, whereas successive binding of EGF and ATP shift the association equilibrium toward the catalytically active monomeric form. The promotion of the monomeric state by ATP can be mimicked by various nonphosphorylating analogs indicating that nucleotide binding rather than autophosphorylation is responsible for stabilizing the monomeric receptor form. Truncated receptor forms, lacking either the external EGF-binding domain or the internal kinase (ATP-binding) domain, are unable to form stable dimers. These results suggest that both intra- and extracellular domains of the receptor act to stabilize the kinase-regulatory dimer.

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Accession: 006288911

PMID: 3017992

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