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REACTIVITY SENSITIVITY MW (kDa) SOURCE
185 Rabbit

Product Usage Information

Storage: Supplied in 10 mM sodium HEPES (pH 7.5), 150 mM NaCl, 100 µg/ml BSA and 50% glycerol. Store at –20°C. Do not aliquot the antibody.

Specificity / Sensitivity

Phospho-HER2/ErbB2 (Tyr1112) Antibody detects ErbB2 only when activated by phosphorylation at Tyr1112. This antibody may cross-react with other activated ErbB family members (e.g. EGF receptor).


Source / Purification

Polyclonal antibodies are produced by immunizing animals with a synthetic phosphopeptide corresponding to residues surrounding tyrosine 1112 of human ErbB2. Antibodies are purified by protein A and peptide affinity chromatography.

The ErbB2 (HER2) proto-oncogene encodes a 185 kDa transmembrane, receptor-like glycoprotein with intrinsic tyrosine kinase activity (1). While ErbB2 lacks an identified ligand, ErbB2 kinase activity can be activated in the absence of a ligand when overexpressed and through heteromeric associations with other ErbB family members (2). Amplification of the ErbB2 gene and overexpression of its product are detected in almost 40% of human breast cancers (3). Binding of the c-Cbl ubiquitin ligase to ErbB2 at Tyr1112 leads to ErbB2 poly-ubiquitination and enhances degradation of this kinase (4). ErbB2 is a key therapeutic target in the treatment of breast cancer and other carcinomas and targeting the regulation of ErbB2 degradation by the c-Cbl-regulated proteolytic pathway is one potential therapeutic strategy. Phosphorylation of the kinase domain residue Tyr877 of ErbB2 (homologous to Tyr416 of pp60c-Src) may be involved in regulating ErbB2 biological activity. The major autophosphorylation sites in ErbB2 are Tyr1248 and Tyr1221/1222; phosphorylation of these sites couples ErbB2 to the Ras-Raf-MAP kinase signal transduction pathway (1,5).


1.  Muthuswamy, S.K. et al. (1999) Mol Cell Biol 19, 6845-57.

2.  Qian, X. et al. (1994) Proc Natl Acad Sci USA 91, 1500-4.

3.  Dittadi, R. and Gion, M. (2000) J Natl Cancer Inst 92, 1443-4.

4.  Klapper, L.N. et al. (2000) Cancer Res 60, 3384-8.

5.  Kwon, Y.K. et al. (1997) J Neurosci 17, 8293-9.


Entrez-Gene Id 2064
Swiss-Prot Acc. P04626


For Research Use Only. Not For Use In Diagnostic Procedures.
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