1RY7

Crystal Structure of the 3 Ig form of FGFR3c in complex with FGF1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.341 
  • R-Value Work: 0.277 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Insights into the molecular basis for fibroblast growth factor receptor autoinhibition and ligand-binding promiscuity.

Olsen, S.K.Ibrahimi, O.A.Raucci, A.Zhang, F.Eliseenkova, A.V.Yayon, A.Basilico, C.Linhardt, R.J.Schlessinger, J.Mohammadi, M.

(2004) Proc.Natl.Acad.Sci.Usa 101: 935-940

  • DOI: 10.1073/pnas.0307287101

  • PubMed Abstract: 
  • The prototypical fibroblast growth factor receptor (FGFR) extracellular domain consists of three Ig domains (D1-D3) of which the two membrane-proximal D2 and D3 domains and the interconnecting D2-D3 linker bear the determinants of ligand binding and ...

    The prototypical fibroblast growth factor receptor (FGFR) extracellular domain consists of three Ig domains (D1-D3) of which the two membrane-proximal D2 and D3 domains and the interconnecting D2-D3 linker bear the determinants of ligand binding and specificity. In contrast, D1 and the D1-D2 linker are thought to play autoinhibitory roles in FGFR regulation. Here, we report the crystal structure of the three-Ig form of FGFR3c in complex with FGF1, an FGF that binds promiscuously to each of the seven principal FGFRs. In this structure, D1 and the D1-D2 linker are completely disordered, demonstrating that these regions are dispensable for FGF binding. Real-time binding experiments using surface plasmon resonance show that relative to two-Ig form, the three-Ig form of FGFR3c exhibits lower affinity for both FGF1 and heparin. Importantly, we demonstrate that this autoinhibition is mediated by intramolecular interactions of D1 and the D1-D2 linker with the minimal FGF and heparin-binding D2-D3 region. As in the FGF1-FGFR2c structure, but not the FGF1-FGFR1c structure, the alternatively spliced betaC'-betaE loop is ordered and interacts with FGF1 in the FGF1-FGFR3c structure. However, in contrast to the FGF1-FGFR2c structure in which the betaC'-betaE loop interacts with the beta-trefoil core region of FGF1, in the FGF1-FGFR3c structure, this loop interacts extensively with the N-terminal region of FGF1, underscoring the importance of the FGF1 N terminus in conferring receptor-binding affinity and promiscuity. Importantly, comparison of the three FGF1-FGFR structures shows that the flexibility of the betaC'-betaE loop is a major determinant of ligand-binding specificity and promiscuity.


    Organizational Affiliation

    Departments of Pharmacology and Microbiology, New York University School of Medicine, New York, NY 10016, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Heparin-binding growth factor 1
A
155Homo sapiensMutation(s): 0 
Gene Names: FGF1 (FGFA)
Find proteins for P05230 (Homo sapiens)
Go to Gene View: FGF1
Go to UniProtKB:  P05230
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fibroblast growth factor receptor 3
B
334Homo sapiensMutation(s): 0 
Gene Names: FGFR3 (JTK4)
EC: 2.7.10.1
Find proteins for P22607 (Homo sapiens)
Go to Gene View: FGFR3
Go to UniProtKB:  P22607
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.341 
  • R-Value Work: 0.277 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 104.223α = 90.00
b = 64.748β = 94.67
c = 99.932γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-02-10
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance