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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Crosby, R. M. Luther, M. Luttrell, D. K. Rodriguez, M. Berman, J. Lee, A. Lansing, T. J. Jung, K. D. Willard, D. Gilmer, T. M. |
| Description | Author Affiliation: Luttrell DK ( Department of Cell Biology, Glaxo Research Institute, Research Triangle Park, NC 27709.); |
| Abstract | The phosphotyrosine residues of receptor tyrosine kinases serve as unique binding sites for proteins involved in intracellular signaling, which contain SRC homology 2 (SH2) domains. Since overexpression or activation of the pp60c-src kinase has been reported in a number of human tumors, including primary human breast carcinomas, we examined the interactions of the SH2 and SH3 domains of human SRC with target proteins in human carcinoma cell lines. Glutathione S-transferase fusion proteins containing either the SH2, SH3, or the entire SH3/SH2 region of human SRC were used to affinity purify tyrosine-phosphorylated proteins from human breast carcinoma cell lines. We show here that in human breast carcinoma cell lines, the SRC SH2 domain binds to activated epidermal growth factor receptor (EGFR) and p185HER2/neu. SRC SH2 binding to EGFR was also observed in a nontumorigenic cell line after hormone stimulation. Endogenous pp60c-src was found to tightly associate with tyrosine-phosphorylated EGFR. Association of the SRC SH2 with the EGFR was blocked by tyrosyl phosphopeptides containing the sequences surrounding tyrosine-530, the regulatory site in the SRC C terminus, or sequences surrounding the major sites of autophosphorylation in the EGFR. These results raise the possibility that association of pp60c-src with these receptor tyrosine kinases is an integral part of the signaling events mediated by these receptors and may contribute to malignant transformation. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 1 |
| Volume Number | 91 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1994-02-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Breast Neoplasms Metabolism Proto-Oncogene Proteins Pp60(c-src) Proto-Oncogene Proteins Receptor, Epidermal Growth Factor Amino Acid Sequence Binding, Competitive In Vitro Techniques Molecular Sequence Data Phosphopeptides Protein Binding Receptor Protein-Tyrosine Kinases Receptor, ErbB-2 Signal Transduction Tumor Cells, Cultured Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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