1AFC

STRUCTURAL STUDIES OF THE BINDING OF THE ANTI-ULCER DRUG SUCROSE OCTASULFATE TO ACIDIC FIBROBLAST GROWTH FACTOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 

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This is version 2.1 of the entry. See complete history


Literature

Structural studies of the binding of the anti-ulcer drug sucrose octasulfate to acidic fibroblast growth factor.

Zhu, X.Hsu, B.T.Rees, D.C.

(1993) Structure 1: 27-34

  • DOI: https://doi.org/10.1016/0969-2126(93)90006-3
  • Primary Citation of Related Structures:  
    1AFC

  • PubMed Abstract: 

    The anti-ulcer drug sucrose octasulfate (SOS) binds to fibroblast growth factors (FGFs), proteins which stimulate the growth and differentiation of several cell types, including stomach epithelial cells. It is believed that SOS stabilizes FGFs against acid denaturation in the stomach, thus enhancing their ability to stimulate healing of ulcerated tissue. SOS binds to the same site on FGF as heparin and other proteoglycans; in vivo, FGF must bind to cell-surface proteoglycans or to heparin before it can interact with FGF receptors and stimulate growth. The details of this process are not understood. We report the crystal structure of a 1:1 complex between acidic FGF (aFGF) and SOS at 2.7 A resolution. SOS binds to a positively charged region of aFGF, largely composed of residues 112-127, and makes contacts primarily with Lys112, Arg116, Lys118, and Arg122. This region is also important in binding heparin. The overall conformation of aFGF is not changed by binding SOS, although the positions of some side chains in the binding site shift by as much as 6 A. The SOS-FGF crystal structure is consistent with the model that SOS stabilizes FGF by neutralizing several positively charged residues that would destabilize the native structure by electrostatic repulsion. On the basis of this structure, we provide a model for the complex of heparin with an FGF dimer. Such interactions may facilitate FGF receptor dimerization, which may be important in receptor signaling.


  • Organizational Affiliation

    Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena 91125.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ACIDIC FIBROBLAST GROWTH FACTOR
A, B, C, D, E
A, B, C, D, E, F, G, H
140Bos taurusMutation(s): 0 
UniProt
Find proteins for P03968 (Bos taurus)
Explore P03968 
Go to UniProtKB:  P03968
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03968
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
1,3,4,6-tetra-O-sulfo-beta-D-fructofuranose-(2-1)-2,3,4,6-tetra-O-sulfonato-alpha-D-glucopyranose
I, J, K, L, M
I, J, K, L, M, N, O, P
2N/A
Glycosylation Resources
GlyTouCan:  G97555GV
GlyCosmos:  G97555GV
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Work: 0.204 
  • R-Value Observed: 0.204 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 110.6α = 90
b = 110.6β = 90
c = 172.2γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1993-10-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Other, Structure summary
  • Version 2.1: 2024-02-07
    Changes: Data collection, Database references, Structure summary