Asymmetric receptor contact is required for tyrosine autophosphorylation of fibroblast growth factor receptor in living cells.
Tyrosine autophosphorylation of receptor tyrosine kinases plays a critical role in regulation of kinase activity and in recruitment and activation of intracellular signaling pathways. Autophosphorylation is mediated by a sequential and precisely ordered intermolecular (trans) reaction. In this report we present structural and biochemical experiments demonstrating that formation of an asymmetric dimer between activated FGFR1 kinase domains is required for transphosphorylation of FGFR1 in FGF-stimulated cells. Transphosphorylation is mediated by specific asymmetric contacts between the N-lobe of one kinase molecule, which serves as an active enzyme, and specific docking sites on the C-lobe of a second kinase molecule, which serves a substrate. Pathological loss-of-function mutations or oncogenic activating mutations in this interface may hinder or facilitate asymmetric dimer formation and transphosphorylation, respectively. The experiments presented in this report provide the molecular basis underlying the control of transphosphorylation of FGF receptors and other receptor tyrosine kinases.
Department of Pharmacology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA.
Jae Hyun
JH
Bae
Titus J
TJ
Boggon
Francisco
F
Tomé
Valsan
V
Mandiyan
Irit
I
Lax
Joseph
J
Schlessinger
D000818:Animals; D002460:Cell Line; D002846:Chromatography, Affinity; D002850:Chromatography, Gel; D003460:Crystallization; D019281:Dimerization; D015151:Immunoblotting; D047468:Immunoprecipitation; D008958:Models, Molecular; D016297:Mutagenesis, Site-Directed; D010766:Phosphorylation; D051381:Rats; D017468:Receptors, Fibroblast Growth Factor / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*; D014443:Tyrosine / Q000378:metabolism*
D017468:Receptors, Fibroblast Growth Factor; D014443:Tyrosine