title: Asymmetric tyrosine kinase arrangements in activation or autophosphorylation of receptor tyrosine kinases.
abstract: Receptor tyrosine kinases (RTKs) play important roles in the control of many cellular processes including cell proliferation, cell adhesion, angiogenesis, and apoptosis. Ligand-induced dimerization of RTKs leads to autophosphorylation and activation of RTKs. Structural studies have shown that while isolated ectodomains of several RTKs form symmetric dimers the isolated cytoplasmic kinase domains of epidermal growth factor receptor (EGFR) and fibroblast growth factor receptor (FGFR) form asymmetric dimers during their activation. Binding of one kinase molecule of EGFR to a second kinase molecule asymmetrically leads to stimulation of kinase activity and enhanced autophosphorylation. Furthermore, the structures of the kinase domain of FGFR1 and FGFR2 reveal the formation of asymmetric interfaces in the processes of autophosphorylation at their specific phosphotyrosine (pY) sites. Disruption of asymmetric dimer interface of EGFR leads to reduction in enzymatic activity and drastic reduction of autophosphorylation of FGFRs in ligand-stimulated live cells. These studies demonstrate that asymmetric dimer formation is as a common phenomenon critical for activation and autophosphorylation of RTKs.
authors.affiliation: Department of Pharmacology, Yale University School of Medicine, 333 Cedar St., New Haven, CT 06520-8066, USA. jaehyun.bae@yale.edu
authors.forename: Jae Hyun
authors.initials: JH
authors.lastname: Bae
authors.forename: Joseph
authors.initials: J
authors.lastname: Schlessinger
mesh_terms: D000494:Allosteric Regulation; D000818:Animals; D019281:Dimerization; D066246:ErbB Receptors / Q000737:chemistry / Q000378:metabolism*; D006801:Humans; D010766:Phosphorylation; D011485:Protein Binding; D011487:Protein Conformation; D054730:Protein Interaction Domains and Motifs; D011505:Protein-Tyrosine Kinases / Q000737:chemistry / Q000378:metabolism*; D051496:Receptor, Fibroblast Growth Factor, Type 1 / Q000737:chemistry / Q000378:metabolism*; D051497:Receptor, Fibroblast Growth Factor, Type 2 / Q000737:chemistry / Q000378:metabolism*
chemical_list: C512478:EGFR protein, human; D066246:ErbB Receptors; D011505:Protein-Tyrosine Kinases; D051496:Receptor, Fibroblast Growth Factor, Type 1; D051497:Receptor, Fibroblast Growth Factor, Type 2