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• W2889405890 abstract "The interaction of glycosaminoglycans with plasma fibronectin (PFn) may play a role in the conversion of PFn from an “inert” dimeric circulating form to an “activated” multimeric form deposited on the cell surface or in the extracellular matrix. We carried out a quantitative comparison of heparin affinity for PFn and its proteolytic fragments in order to assess the relative importance of heparin interactions with PFn’s various reported heparin-binding domains. We employed affinity chromatography on PFn-sepharose to prepare a subset of fluorescein-labelled heparin molecules with high affinity for PFn, and confirmed that heparin binding to PFn is very sensitive to ionic strength. This suggests that the PFn-sepharose column selectively binds a fraction of highly sulfated heparin molecules. We quantified PFn-heparin affinity in the fluid-phase by monitoring a fluorescence polarization change that occurred as a consequence of the decrease in the rotational diffusion rate of fluorescently-labelled heparin molecules (13.8 kD) as they became “immobilized” by binding to PFn. Scatchard analysis of the heparin fluorescence polarization data obtained for PFn in Tris-buffered saline yielded a biphasic curve with Kd’s estimated at 5 and 130 nM, respectively A 190 kD thrombin fragment, containing the C-terminal Hep II domain but lacking the 29 kD N-terminal “Hep I” domain, yielded a linear plot displaying a single class of heparin-binding sites with a Kd of 130 nM Similar results were obtained for the C-terminal 150 kD Fn fragment which also contained the “Hep II” domain. In contrast, the 29 kD N-terminal “Hep I” Fn fragment bound heparin weakly (Kd =25 μM). The nature of the “high affinity (Kd= 5 nM) heparin binding component is uncertain; it may reflect heparin interaction with soluble multimers present in our PFn preparations Our observations suggest that the Kd=130 nM heparin binding component corresponds to heparin interaction with the C-terminal “Hep II” domain We conclude that the N-terminal “Hep I” domain does not participate significantly in heparin binding to soluble dimeric Fn under physiological conditions, whereas the C-terminal “Hep II” domain dominates such interactions" @default.
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• W2889405890 date "1987-01-01" @default.
• W2889405890 modified "2023-09-23" @default.
• W2889405890 title "EVIDENCE THAT THE C-TERMINAL HEPARIN BINDING DOMAIN (HEP II) DOMINATES HEPARIN-FIBRONECTIN INTERACTIONS" @default.
• W2889405890 doi "https://doi.org/10.1055/s-0038-1643631" @default.
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