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Phys. Rev. Lett. 83, 652–655 (1999)

Statistical Breakage of Single Protein A-IgG Bonds Reveals Crossover from Spontaneous to Force-Induced Bond Dissociation

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D. A. Simson, M. Strigl, M. Hohenadl, and R. Merkel
Lehrstuhl für Biophysik E22, Technische Universität München, James-Franck-Strasse 1, D-85748 Garching, Germany

Received 7 December 1998; revised 5 May 1999; published in the issue dated 19 July 1999

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Dynamic force spectroscopy was applied to single specific bonds between immunoglobulins of type G and protein A, a staphylococcal receptor for IgG. The resulting spectra of yield forces indicated the crossover from force induced to spontaneous bond dissociation. Moreover, failure of unloaded bonds was observed directly. Extrapolation to vanishing loading rate and direct observation yielded coinciding results.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.652
DOI:
10.1103/PhysRevLett.83.652
PACS:
87.15.By, 82.20.Mj, 87.64.-t