CST, 88583S, Phospho-HER2/ErbB2 (Thr686) Antibody

Polyclonal Antibody for studying HER2/ErbB2 (Thr686) phosphate. Validated for Western Blotting. Highly specific and rigorously validated in-house, Phospho-HER2/ErbB2 (Thr686) Antibody (CST #88583) is ready to ship. Product Usage Information Western Blotting: 1:1000 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. Protocol Available protocols: Western Blotting Specificity / Sensitivity Phospho-HER2/ErbB2 (Thr686) Antibody recognizes endogenous levels of HER2/ERBB2 protein only when phosphorylated at Thr686. Species Reactivity: Human Source / Purification Polyclonal antibodies are produced by immunizing animals with a synthetic phospho-peptide corresponding to residues surrounding Thr686 of human HER2/ERBB2 protein. Antibodies are purified by protein A and peptide affinity chromatography. Background 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 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). Thr686 is located in the cytoplasmic juxtamembrane region of ErbB2. PKC, PKA, and PKG II kinases have been reported to phosphorylate ErbB2 at this site, but the functional consequences of phosphorylation may be context dependent. For example, one research study reported that phosphorylation of ErbB2 at Thr686 enhanced ligand-induced receptor activation (6), while a separate research study reported inhibitory effects of phosphorylation on ErbB2 activation (8). Alternate Names c-erb B2/neu protein; CD340; erb-b2 receptor tyrosine kinase 2; erbB-2; ERBB2; HER-2; HER-2/neu; HER2; herstatin; human epidermal growth factor receptor 2; Metastatic lymph node gene 19 protein; MLN 19; MLN19; NEU; neuro/glioblastoma derived oncogene homolog; neuroblastoma/glioblastoma derived oncogene homolog; NGL; p185erbB2; Proto-oncogene c-ErbB-2; Proto-oncogene Neu; Receptor tyrosine-protein kinase erbB-2; TKR1; Tyrosine kinase-type cell surface receptor HER2; v-erb-b2 avian erythroblastic leukemia viral oncogene homolog 2; v-erb-b2 avian erythroblastic leukemia viral oncogene homolog 2 (neuro/glioblastoma derived oncogene homolog); v-erb-b2 avian erythroblastic leukemia viral oncoprotein 2; v-erb-b2 erythroblastic leukemia viral oncogene homolog 2, neuro/glioblastoma derived oncogene homolog; v-erb-b2 erythroblastic leukemia viral oncogene homolog 2, neuro/glioblastoma derived oncogene homolog (avian) Specification REACTIVITY: H SENSITIVITY: Endogenous MW (kDa): 185 SOURCE: Rabbit