Dynamic single-molecule force spectroscopy was performed to monitor the unbinding of fibronectin with the proteoglycans syndecan-4 (SDC4) and decorin and to compare this with the unbinding characteristics of a 5 b 1-integrin. A single energy barrier was sufficient to describe the unbinding of both SDC4 and decorin from fibronectin, whereas two barriers were observed for the dissociation of a 5 b 1-integrin from fibronectin. The outer (high-affinity) barriers in the interactions of fibronectin with a 5 b 1-integrin and SDC4 are characterized by larger barrier heights and widths and slower dissociation rates than those of the inner (low-affinity) barriers in the interactions of fibronectin with a 5 b 1-integrin and decorin. These results indicate that SDC4 and (ultimately) a 5 b 1-integrin have the ability to withstand deformation in their interactions with fibronectin, whereas the decorinfibronectin interaction is considerably more brittle.
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