Add time:09/04/2019         Source:sciencedirect.com

Dynamic force spectroscopy was used to test force-induced dissociation of the complex between the integrin α7β1 and the bacterial protein invasin (cas 114073-91-5). Both proteins were used in truncated forms comprising the respective binding sites. Using the biomembrane force-probe, the bond system was exposed to 14 different loading rates ranging from 18 pN/s to 5.3 nN/s. At each rate, bond rupture spectra were collected. Median forces ranged from 8 to 72 pN. These showed two linear regimes when plotted against the logarithm of the force-loading rate. However, a statistical analysis of the full rupture force spectra including the detection limits of the setup showed that all measured data are well described by dissociation over a single barrier.

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