Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 47.64 kDa 
• Atom Count: 2549 
• Residue Count: 314 
• Unique protein chains: 1

3F1R

Crystal structure of FGF20 dimer

• DOI: 10.2210/pdb3F1R/pdb

• Classification: HORMONE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2008-10-28 Released: 2009-07-28 
• Deposition Author(s): Kalinina, J., Mohammadi, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.273 
• R-Value Work: 0.256 

Literature

Homodimerization controls the fibroblast growth factor 9 subfamily's receptor binding and heparan sulfate-dependent diffusion in the extracellular matrix

Kalinina, J., Byron, S.A., Makarenkova, H.P., Olsen, S.K., Eliseenkova, A.V., Larochelle, W.J., Dhanabal, M., Blais, S., Ornitz, D.M., Day, L.A., Neubert, T.A., Pollock, P.M., Mohammadi, M.

(2009) Mol Cell Biol 29: 4663-4678

• PubMed: 19564416 
• DOI: 10.1128/MCB.01780-08
• Primary Citation of Related Structures:  
  3F1R


• PubMed Abstract: 
  

Uncontrolled fibroblast growth factor (FGF) signaling can lead to human diseases, necessitating multiple layers of self-regulatory control mechanisms to keep its activity in check. Herein, we demonstrate that FGF9 and FGF20 ligands undergo a reversible homodimerization, occluding their key receptor binding sites. To test the role of dimerization in ligand autoinhibition, we introduced structure-based mutations into the dimer interfaces of FGF9 and FGF20. The mutations weakened the ability of the ligands to dimerize, effectively increasing the concentrations of monomeric ligands capable of binding and activating their cognate FGF receptor in vitro and in living cells. Interestingly, the monomeric ligands exhibit reduced heparin binding, resulting in their increased radii of heparan sulfate-dependent diffusion and biologic action, as evidenced by the wider dilation area of ex vivo lung cultures in response to implanted mutant FGF9-loaded beads. Hence, our data demonstrate that homodimerization autoregulates FGF9 and FGF20's receptor binding and concentration gradients in the extracellular matrix. Our study is the first to implicate ligand dimerization as an autoregulatory mechanism for growth factor bioactivity and sets the stage for engineering modified FGF9 subfamily ligands, with desired activity for use in both basic and translational research.

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Organizational Affiliation: 

Department of Pharmacology of New York University School of Medicine, New York, New York 10016, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Fibroblast growth factor 20	A, B	211	Homo sapiens	Mutation(s): 0  Gene Names: FGF20
Find proteins for Q9NP95 (Homo sapiens) Explore Q9NP95  Go to UniProtKB:  Q9NP95
NIH Common Fund Data Resources
PHAROS  Q9NP95 GTEx  ENSG00000078579

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	A, B	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.273 
• R-Value Work: 0.256 
• Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 102.144	α = 90
b = 102.144	β = 90
c = 119.8	γ = 120

Software Package:

Software Name	Purpose
HKL-2000	data collection
AMoRE	phasing
CNS	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-10-28 
• Released Date: 2009-07-28 
Deposition Author(s): Kalinina, J., Mohammadi, M.

Revision History 

• Version 1.0: 2009-07-28
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance