c-erbB-2 Antibody

C-erbB-2 (HER2) is a member of the epidermal growth factor (EGF) receptor family of receptor tyrosine kinases. HER2 has no ligand binding domain on its own and therefore cannot bind growth factors. However, HER2 does bind tightly to other ligand-bound EGF receptor family members to form a heterodimer, stabilizing ligand binding and enhancing kinase-mediated activation of downstream signalling pathways, such as those involving mitogen-activated protein kinase and phosphatidylinositol-3 kinase.