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An expression cloning method which allows direct isolation of cDNAs encoding substrates for tyrosine kinases was applied to the study of the epidermal growth factor (EGF) receptor (EGFR) signaling pathway. A previously undescribed cDNA was isolated and designated eps15. The structural features of the predicted eps15 gene product allow its subdivision into three domains. Domain I contains signatures of a regulatory domain, including a candidate tyrosine phosphorylation site and EF-hand-type calcium-binding domains. Domain II presents the characteristic heptad repeats of coiled-coil rod-like proteins, and domain III displays a repeated aspartic acid-proline-phenylalanine motif similar to a consensus sequence of several methylases. Antibodies specific for the eps15 gene product recognize two proteins: a major species of 142 kDa and a minor component of 155 kDa, both of which are phosphorylated on tyrosine following EGFR activation by EGF in vivo. EGFR is also able to directly phosphorylate the eps15 product in vitro. In addition, phosphorylation of the eps15 gene product in vivo is relatively receptor specific, since the erbB-2 kinase phosphorylates it very inefficiently. Finally, overexpression of eps15 is sufficient to transform NIH 3T3 cells, thus suggesting that the eps15 gene product is involved in the regulation of mitogenic signals.

Type

Journal article

Journal

Mol Cell Biol

Publication Date

09/1993

Volume

13

Pages

5814 - 5828

Keywords

3T3 Cells, Adaptor Proteins, Signal Transducing, Amino Acid Sequence, Animals, Base Sequence, Calcium-Binding Proteins, Cell Compartmentation, Cell Division, Cell Transformation, Neoplastic, Cloning, Molecular, Intracellular Signaling Peptides and Proteins, Mice, Molecular Sequence Data, Phosphoproteins, Phosphotyrosine, Protein-Tyrosine Kinases, Proto-Oncogene Proteins, Receptor, Epidermal Growth Factor, Receptor, ErbB-2, Sequence Alignment, Signal Transduction, Tyrosine