PhosphoPlus® EGFR (Tyr1068) Antibody Duet, UniProt ID P00533, Entrez ID 1956 #11862

Protocols

• 3777: Western Blotting, Immunohistochemistry (Paraffin), Immunofluorescence, Flow
• 4267: Western Blotting, Immunoprecipitation (Magnetic), Immunohistochemistry (Paraffin), Immunofluorescence, Flow

PhosphoPlus® Duets from Cell Signaling Technology (CST) provide a means to assess protein activation status. Each Duet contains an activation-state and total protein antibody to your target of interest. These antibodies have been selected from CST's product offering based upon superior performance in specified applications.

The epidermal growth factor (EGF) receptor is a transmembrane tyrosine kinase that belongs to the HER/ErbB protein family. Ligand binding results in receptor dimerization, autophosphorylation, activation of downstream signaling, internalization, and lysosomal degradation (1,2). Phosphorylation of EGF receptor (EGFR) at Tyr845 in the kinase domain is implicated in stabilizing the activation loop, maintaining the active state enzyme, and providing a binding surface for substrate proteins (3,4). c-Src is involved in phosphorylation of EGFR at Tyr845 (5). The SH2 domain of PLCγ binds at phospho-Tyr992, resulting in activation of PLCγ-mediated downstream signaling (6). Phosphorylation of EGFR at Tyr1045 creates a major docking site for the adaptor protein c-Cbl, leading to receptor ubiquitination and degradation following EGFR activation (7,8). The GRB2 adaptor protein binds activated EGFR at phospho-Tyr1068 (9). A pair of phosphorylated EGFR residues (Tyr1148 and Tyr1173) provide a docking site for the Shc scaffold protein, with both sites involved in MAP kinase signaling activation (2). Phosphorylation of EGFR at specific serine and threonine residues attenuates EGFR kinase activity. EGFR carboxy-terminal residues Ser1046 and Ser1047 are phosphorylated by CaM kinase II; mutation of either of these serines results in upregulated EGFR tyrosine autophosphorylation (10).

1. Hackel, P.O. et al. (1999) Curr Opin Cell Biol 11, 184-9.
2. Zwick, E. et al. (1999) Trends Pharmacol Sci 20, 408-12.
3. Cooper, J.A. and Howell, B. (1993) Cell 73, 1051-4.
4. Hubbard, S.R. et al. (1994) Nature 372, 746-54.
5. Biscardi, J.S. et al. (1999) J Biol Chem 274, 8335-43.
6. Emlet, D.R. et al. (1997) J Biol Chem 272, 4079-86.
7. Levkowitz, G. et al. (1999) Mol Cell 4, 1029-40.
8. Ettenberg, S.A. et al. (1999) Oncogene 18, 1855-66.
9. Rojas, M. et al. (1996) J Biol Chem 271, 27456-61.
10. Feinmesser, R.L. et al. (1999) J Biol Chem 274, 16168-73.

Yokdang, N. et al. (2016) Oncogene 35, 2932-47.

Data sheet (80KB)