1afc

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spinqualitylabelsall models 1afc, resolution 2.7Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

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

Overview

BACKGROUND: 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. RESULTS: 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. CONCLUSION: 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.

About this Structure

1AFC is a Single protein structure of sequence from Bos taurus with SCR as ligand. Full crystallographic information is available from OCA.

Reference

Structural studies of the binding of the anti-ulcer drug sucrose octasulfate to acidic fibroblast growth factor., Zhu X, Hsu BT, Rees DC, Structure. 1993 Sep 15;1(1):27-34. PMID:7520817

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