Structural basis for interaction of FGF-1, FGF-2, and FGF-7 with different heparan sulfate motifs.Ye, S., Luo, Y., Lu, W., Jones, R.B., Linhardt, R.J., Capila, I., Toida, T., Kan, M., Pelletier, H., McKeehan, W.L.
(2001) Biochemistry 40: 14429-14439
- PubMed: 11724555
- DOI: 10.1021/bi011000u
- Primary Citation of Related Structures:
- PubMed Abstract:
- The glycine box: a determinant of specificity for fibroblast growth factor
Luo, Y., Lu, W., Mohamedali, K.A., Jang, J.H., Jones, R.B., Gabriel, J.L., Kan, M., McKeehan, W.L.
(1998) Biochemistry 37: 16506
- Human KGF is FGF-related with properties of a paracrine effector of epithelial cell growth.
Finch, P.W., Rubin, J.S., Miki, T., Ron, D., Aaronson, S.A.
(1989) Science 245: 752
- Structure of a heparin-linked biologically active dimer of fibroblast growth factor.
DiGabriele, A.D., Lax, I., Chen, D.I., Svahn, C.M., Jaye, M., Schlessinger, J., Hendrickson, W.A.
(1998) Nature 393: 812
- Heparin structure and interactions with basic fibroblast growth factor.
Faham, S., Hileman, R.E., Fromm, J.R., Linhardt, R.J., Rees, D.C.
(1996) Science 271: 1116
Stromal cell-derived FGF-7 binds and activates only the resident FGFR2IIIb in epithelial cells while FGF-1 and FGF-2 exhibit a broader interaction with multiple isoforms of FGFR. Here we report the structure of FGF-7 that has been solved to 3.1 A res ...
Stromal cell-derived FGF-7 binds and activates only the resident FGFR2IIIb in epithelial cells while FGF-1 and FGF-2 exhibit a broader interaction with multiple isoforms of FGFR. Here we report the structure of FGF-7 that has been solved to 3.1 A resolution by molecular replacement with the structure of a dual function chimera of FGF-7 and FGF-1 (FGF-7/1) which was resolved to 2.3 A. Comparison of the FGF-7 structure to that of FGF-1 and FGF-2 revealed the strongly conserved Calpha backbone among the three FGF polypeptides and the surface hydrophobic patch that forms the primary receptor-binding domain. In contrast, a decrease and dispersion of the positive surface charge density characterized the heparin-binding domain of FGF-7 defined by homology to that of FGF-1 and FGF-2 in complexes with heparin. A simple heparin hexasaccharide that cocrystallized with FGF-1 and FGF-2 and protected both against protease in solution failed to exhibit the same properties with FGF-7. In contrast to FGF-1 and FGF-2, protection of FGF-7 was enhanced by heparin oligosaccharides of increased length with those exhibiting a 3-O-sulfate being the most effective. Protection of FGF-7 required interaction with specifically the fraction of crude heparin retained on antithrombin affinity columns. Conversely, heparin enriched by affinity for immobilized FGF-7 exhibited anti-factor Xa activity similar to that purified on an antithrombin affinity matrix. In contrast, an FGF-1 affinity matrix enriched the fraction of crude heparin with low anti-factor Xa activity. The results provide a structural basis to suggest that the unique FGF-7 heparin-binding (HB) domain underlies a specific restriction in respect to composition and length of the heparan sulfate motif that may impact specificity of localization, stability, and trafficking of FGF-7 in the microenvironment, and formation and activation of the FGFR2IIIb kinase signaling complex in epithelial cells.
Department of Biochemistry, Baylor College of Medicine, One Baylor Plaza, Houston, Texas, 77030, USA.