Anti-EGFR, clone H9B4

0.2 mg/ml with 0.1 mg/ml BSA (US sourced), 0.05% sodium azide. Epidermal Growth Factor Receptor is a type I receptor tyrosine kinase, referred to as EGFR, ErbB-1 and HER1. When EGFR is activated by one of its ligands, it dimerizes. It can form a homodimer, heterodimers with other ErbB family members, or even a cluster of EGFRs. Activation stimulates EGFRs intracellular kinase activity. Autophosphorylation of tyrosine residues in the C-terminal domain of EGFR leads to association with proteins with phosphotyrosine-binding domains which then signal the initiation of signal transduction cascades including the JNK, MAPK, AKT, and possibly Nf-KB, pathways. Overexpression of EGFR is the cause of some types of cancer, including lung and colon cancer. It has also been linked to psoriasis, eczema and atherosclerosis, although poorly defined. Monoclonal antibody to EGFR can be used to block the extracellular ligand binding domain, therebye blocking tyrosine kinase activation and subsequent signal transduction. Protein function: Receptor tyrosine kinase binding ligands of the EGF family and activating several signaling cascades to convert extracellular cues into appropriate cellular responses. Known ligands include EGF, TGFA/TGF-alpha, amphiregulin, epigen/EPGN, BTC/betacellulin, epiregulin/EREG and HBEGF/heparin-binding EGF. Ligand binding triggers receptor homo- and/or heterodimerization and autophosphorylation on key cytoplasmic residues. The phosphorylated receptor recruits adapter proteins like GRB2 which in turn activates complex downstream signaling cascades. Activates at least 4 major downstream signaling cascades including the RAS- RAF-MEK-ERK, PI3 kinase-AKT, PLCgamma-PKC and STATs modules. May also activate the NF-kappa-B signaling cascade. Also directly phosphorylates other proteins like RGS16, activating its GTPase activity and probably coupling the EGF receptor signaling to the G protein-coupled receptor signaling. Also phosphorylates MUC1 and increases its interaction with SRC and CTNNB1/beta-catenin. [The UniProt Consortium]