title: EGF activates its receptor by removing interactions that autoinhibit ectodomain dimerization.
abstract: Epidermal growth factor (EGF) receptor is the prototype of the ErbB (HER) family receptor tyrosine kinases (RTKs), which regulate cell growth and differentiation and are implicated in many human cancers. EGF activates its receptor by inducing dimerization of the 621 amino acid EGF receptor extracellular region. We describe the 2.8 A resolution crystal structure of this entire extracellular region (sEGFR) in an unactivated state. The structure reveals an autoinhibited configuration, where the dimerization interface recently identified in activated sEGFR structures is completely occluded by intramolecular interactions. To activate the receptor, EGF binding must promote a large domain rearrangement that exposes this dimerization interface. This contrasts starkly with other RTK activation mechanisms and suggests new approaches for designing ErbB receptor antagonists.
authors.affiliation: Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA. fertuso2@mail.med.upenn.edu
authors.forename: Kathryn M
authors.initials: KM
authors.lastname: Ferguson
authors.forename: Mitchell B
authors.initials: MB
authors.lastname: Berger
authors.forename: Jeannine M
authors.initials: JM
authors.lastname: Mendrola
authors.forename: Hyun Soo
authors.initials: HS
authors.lastname: Cho
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Leahy
authors.forename: Mark A
authors.initials: MA
authors.lastname: Lemmon
mesh_terms: D018360:Crystallography, X-Ray; D019281:Dimerization; D004815:Epidermal Growth Factor / Q000378:metabolism*; D066246:ErbB Receptors / Q000037:antagonists & inhibitors / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D066298:In Vitro Techniques; D008958:Models, Molecular; D009154:Mutation; D011487:Protein Conformation; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism
chemical_list: D011994:Recombinant Proteins; D004815:Epidermal Growth Factor; D066246:ErbB Receptors