Abstract
The binding affinity and specificity of heparin to proteins is widely recognized to be sulfation-pattern dependent. However, for the majority of heparin-binding proteins (HBPs), it still remains unclear what moieties are involved in the specific binding interaction. Here, we report our study using saturation transfer difference (STD) nuclear magnetic resonance (NMR) to map out the interactions of synthetic heparin oligosaccharides with HBPs, such as basic fibroblast growth factor (FGF2) and fibroblast growth factor 10 (FGF10), to provide insight into the critical epitopes of heparin ligands involved. The irradiation frequency of STD NMR was carefully chosen to excite the methylene protons so that enhanced sensitivity was obtained for the heparin-protein complex. We believe this approach opens up additional application avenues to further investigate heparin-protein interactions.
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