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Immunoaffinity purification of the epidermal growth factor receptor. Stoichiometry of binding and kinetics of self-phosphorylation.
Open accessAbstract
Epidermal growth factor (EGF) receptor protein has been purified in a single high-yield step by immunoaffinity chromatography of extracts of A431 cells. A monoclonal antibody directed against the EGF binding site of the receptor was immobilized to Sepharose 4B as a specific immune absorbent and competitive elution with EGF was used to obtain purified EGF receptor protein with tyrosine kinase activity. The stoichiometry of EGF binding was determined by comparing 125I-EGF binding to A431 cells with the mass of EGF receptor protein in those cells as measured by immunoaffinity chromatography, radioimmunoassay, and immune precipitation. Each measurement indicated one EGF binding site/EGF receptor protein molecule. Study of the kinetics of autophosphorylation revealed rapid incorporation of 1 mol of phosphate/mol of enzyme followed by slower incorporation of additional phosphate groups. The autophosphorylation reaction has a Km for ATP (0.2 microM) which is about 10-fold lower than that for phosphorylation of exogenous substrates. The kinetically preferred autophosphorylation is an intramolecular reaction.
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Cited by
Bremer, E. G., Schlessinger, J., & Hakomori, S. (1986) · Journal of Biological Chemistry · doi:10.1016/s0021-9258(17)35954-9 · Cited by 706
Yarden, Y., & Schlessinger, J. (1987) · Biochemistry · doi:10.1021/bi00379a035 · Cited by 627
Yarden, Y., & Schlessinger, J. (1987) · Biochemistry · doi:10.1021/bi00379a034 · Cited by 507
Zhong, L., Li, B., Jayandharan, G., Mah, C. S., Govindasamy, L., Agbandje-McKenna, M., Herzog, R. W., Weigel-Van Aken, K. A., Hobbs, J. A., Zolotukhin, S., et al. (2008) · Virology · doi:10.1016/j.virol.2008.08.027 · Cited by 232
Qing, K., Hansen, J., Weigel-Kelley, K. A., Tan, M., Zhou, S., & Srivastava, A. (2001) · Journal of Virology · doi:10.1128/jvi.75.19.8968-8976.2001 · Cited by 126
Metadata
- Authors
- Weber, W., Bertics, P. J., & Gill, G. N.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1984-12
- Volume
- 259
- Issue
- 23
- Pages
- 14631-14636
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W1585720578
- Cited by
- 182
- References
- 0
- FWCI
- 7.30
- Type
- journal article
- Language
- en
- Open access
- hybrid
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- CoChat. (2026). Citation check: Immunoaffinity purification of the epidermal growth factor receptor. Stoichiometry of binding and kinetics of self-phosphorylation. https://app.cochat.ai/papers/10.1016/s0021-9258(17)42648-2
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- Weber, W., Bertics, P. J., & Gill, G. N. (1984). Immunoaffinity purification of the epidermal growth factor receptor. Stoichiometry of binding and kinetics of self-phosphorylation. Journal of Biological Chemistry. https://doi.org/10.1016/s0021-9258(17)42648-2
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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