We have used Surface Plasmon Resonance (SPR) - based biosensor technology to investigate the interaction of the six high affinity insulin-like growth factor binding proteins (IGFBP 1-6) with the cell binding domain (CBD) of fibronectin. Using a biotinylated derivative of the ninth and tenth TypeIII domains of FN (9-10FNIII), we show that IGFBP-3 and -5 bind to FN-CBD. We show that this binding is inhibited by IGF-I and that, for IGFBP-5, binding occurs through the C-terminal heparin binding domain of the protein. Using site-directed mutagenesis of 9-10FNIII, we show both the 'synergy' and RGD sites within these FN domains are required for maximum binding of both IGFBPs. We discuss the possible biological consequences of our results.
|Number of pages||4|
|Journal||Biochemical and Biophysical Research Communications|
|Publication status||Published - Feb 2009|
- insulin-like growth factor binding protein
- surface plasmon resonance
Beattie, J., Kreiner, M., Allan, G. J., Flint, D. J., Domingues, D., & van der Walle, C. F. (2009). IGFBP-3 and IGFBP-5 associate with the cell binding domain (CBD) of fibronectin. Biochemical and Biophysical Research Communications, 381(4), 572-576. https://doi.org/10.1016/j.bbrc.2009.02.088