Elucidation of the mechanism of the regulatory function of the Ig1 module of the fibroblast growth factor receptor 1
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Elucidation of the mechanism of the regulatory function of the Ig1 module of the fibroblast growth factor receptor 1. / Kiselyov, Vladislav; Kochoyan, Artur; Poulsen, Flemming; Bock, Elisabeth Marianne; Berezin, Vladimir.
I: Protein Science, Bind 15, Nr. 10, 2006, s. 2318-22.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Elucidation of the mechanism of the regulatory function of the Ig1 module of the fibroblast growth factor receptor 1
AU - Kiselyov, Vladislav
AU - Kochoyan, Artur
AU - Poulsen, Flemming
AU - Bock, Elisabeth Marianne
AU - Berezin, Vladimir
N1 - Keywords: Animals; Binding Sites; Binding, Competitive; Dimerization; Fibroblast Growth Factors; Heparin; Immunoglobulins; Ligands; Magnetic Resonance Spectroscopy; Mice; Protein Binding; Protein Structure, Tertiary; Receptor, Fibroblast Growth Factor, Type 1; Surface Plasmon Resonance
PY - 2006
Y1 - 2006
N2 - The extracellular part of the fibroblast growth factor (FGF) receptor (FGFR) consists of up to three Ig modules (Ig1-Ig3), in which the Ig2 and Ig3 modules determine affinity and specificity for FGF and heparin. The FGFR isoforms lacking the Ig1 module have higher affinity for FGF and heparin than the triple Ig-module isoforms, suggesting that the Ig1 module is involved in the regulation of the FGFR-ligand interaction. We show here by surface plasmon resonance and NMR analyses that the Ig1 module binds to the Ig2 module, and identify by NMR the binding sites involved in the Ig1-Ig2 interaction. The identified binding site in the Ig2 module was found to be in the area of the FGF-Ig2 and Ig2-heparin contact sites, thus providing direct structural evidence that the Ig1 module functions as a competitive autoinhibitor of the FGFR-ligand interaction. Furthermore, the Ig1 binding site of the Ig2 module overlaps the Ig2-Ig2 contact site. This suggests that the function of the Ig1 module is not only regulation of the FGFR-ligand binding affinity but also prevention of spontaneous FGFR dimerization (through a direct Ig2-Ig2 interaction) in the absence of FGF.
AB - The extracellular part of the fibroblast growth factor (FGF) receptor (FGFR) consists of up to three Ig modules (Ig1-Ig3), in which the Ig2 and Ig3 modules determine affinity and specificity for FGF and heparin. The FGFR isoforms lacking the Ig1 module have higher affinity for FGF and heparin than the triple Ig-module isoforms, suggesting that the Ig1 module is involved in the regulation of the FGFR-ligand interaction. We show here by surface plasmon resonance and NMR analyses that the Ig1 module binds to the Ig2 module, and identify by NMR the binding sites involved in the Ig1-Ig2 interaction. The identified binding site in the Ig2 module was found to be in the area of the FGF-Ig2 and Ig2-heparin contact sites, thus providing direct structural evidence that the Ig1 module functions as a competitive autoinhibitor of the FGFR-ligand interaction. Furthermore, the Ig1 binding site of the Ig2 module overlaps the Ig2-Ig2 contact site. This suggests that the function of the Ig1 module is not only regulation of the FGFR-ligand binding affinity but also prevention of spontaneous FGFR dimerization (through a direct Ig2-Ig2 interaction) in the absence of FGF.
U2 - 10.1110/ps.062206106
DO - 10.1110/ps.062206106
M3 - Journal article
C2 - 17008716
VL - 15
SP - 2318
EP - 2322
JO - Protein Science
JF - Protein Science
SN - 0961-8368
IS - 10
ER -
ID: 9935297