Localization of the ganglioside-binding site of fibronectin

L. K. Thompson, P. M. Horowitz, K. L. Bentley, D. D. Thomas, J. F. Alderete, R. J. Klebe

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

It has been demonstrated via biological assays that fibronectin possesses a receptor for gangliosides that is involved in cell adhesion and restoration of the normal morphology of transformed cells. In this study, fluorescence polarization has been employed to monitor the binding of ganglioside oligosaccharide to fibronectin. Parameters involved in ganglioside oligosaccharide binding to fibronectin are described and compared to the interaction of heparin with fibronectin. A K(d) of 1.4 x 10-8 mol/liter has been calculated, and its is demonstrated that labeled ganglioside oligosaccharides can be eluted from fibronectin with either unlabeled ganglioside oligosaccharides or 4 M urea. Using the fluoresence polarization assay developed in this study for measurement of ganglioside binding to fibronectin, it is demonstrated that gangliosides bind to the 31,000-dalton amino terminal heparin-binding domain of fibronectin. A ganglioside-Sepharose affinity column has been constructed which specifically binds the 31,000-dalton amino terminal fragment of fibronectin. The localization of the ganglioside receptor to the amino terminal domain of fibronectin indicates that the ganglioside receptor is distinct from the putative fibronectin cell surface receptor which is located near the center of the fibronectin molecule.

Original languageEnglish (US)
Pages (from-to)5209-5214
Number of pages6
JournalJournal of Biological Chemistry
Volume261
Issue number11
StatePublished - 1986
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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