Structural interactions of fibroblast growth factor receptor with its ligands.
Fibroblast growth factors (FGFs) effect cellular responses by binding to FGF receptors (FGFRs). FGF bound to extracellular domains on the FGFR in the presence of heparin activates the cytoplasmic receptor tyrosine kinase through autophosphorylation. We have crystallized a complex between human FGF1 and a two-domain extracellular fragment of human FGFR2. The crystal structure, determined by multiwavelength anomalous diffraction analysis of the selenomethionyl protein, is a dimeric assemblage of 1:1 ligand:receptor complexes. FGF is bound at the junction between the two domains of one FGFR, and two such units are associated through receptor:receptor and secondary ligand:receptor interfaces. Sulfate ion positions appear to mark the course of heparin binding between FGF molecules through a basic region on receptor D2 domains. This dimeric assemblage provides a structural mechanism for FGF signal transduction.
Stauber
D J
DJ
Department of Biochemistry, Columbia University, New York, NY 10032, USA.
DiGabriele
A D
AD
Hendrickson
W A
WA
D000595:Amino Acid Sequence; D001665:Binding Sites; D003460:Crystallization; D016208:Databases, Factual; D019281:Dimerization; D016220:Fibroblast Growth Factor 1; D016222:Fibroblast Growth Factor 2 / Q000737:chemistry*; D006493:Heparin / Q000737:chemistry; D006801:Humans; D008024:Ligands; D008958:Models, Molecular; D008969:Molecular Sequence Data; D011485:Protein Binding; D011487:Protein Conformation; D011506:Proteins / Q000737:chemistry; D020794:Receptor Protein-Tyrosine Kinases / Q000737:chemistry*; D051497:Receptor, Fibroblast Growth Factor, Type 2; D017468:Receptors, Fibroblast Growth Factor / Q000737:chemistry*; D012645:Selenomethionine / Q000737:chemistry; D051140:Selenoproteins; D016415:Sequence Alignment; D015398:Signal Transduction; D014961:X-Ray Diffraction
D008024:Ligands; D011506:Proteins; D017468:Receptors, Fibroblast Growth Factor; D051140:Selenoproteins; D016222:Fibroblast Growth Factor 2; D016220:Fibroblast Growth Factor 1; D006493:Heparin; D012645:Selenomethionine; C496353:FGFR2 protein, human; D020794:Receptor Protein-Tyrosine Kinases; D051497:Receptor, Fibroblast Growth Factor, Type 2