Abstract
Single-molecule force spectroscopy (SMFS) measurements allow for quantification of the molecular forces required to unfold individual protein domains. Atomic force microscopy (AFM) is one of the long-established techniques for force spectroscopy (FS). Although FS at conventional AFM pulling rates provides valuable information on protein unfolding, in order to get a more complete picture of the mechanism, explore new regimes, and combine and compare experiments with simulations, we need higher pulling rates and μs-time resolution, now accessible via high-speed force spectroscopy (HS-FS). In this chapter, we provide a step-by-step protocol of HS-FS including sample preparation, measurements and analysis of the acquired data using HS-AFM with an illustrative example on unfolding of a well-studied concatamer made of eight repeats of the titin I91 domain.
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Acknowledgments
This work was supported by Agence National de la Recherche grants BioHSFS ANR-15-CE11-0007 and ANR-11-LABX-0054 (Labex INFORM). A.M. was supported by a Long Term EMBO Fellowship (ALTF 1427-2014) and a Marie Curie Action (MSCA-IF-2014-EF-655157). We thank Michael Nash and Wolfgang Ott for sharing the XMod-dockerin-III and cohesin-III plasmids and for technical assistance.
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Sumbul, F., Marchesi, A., Takahashi, H., Scheuring, S., Rico, F. (2018). High-Speed Force Spectroscopy for Single Protein Unfolding. In: Lyubchenko, Y. (eds) Nanoscale Imaging. Methods in Molecular Biology, vol 1814. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-8591-3_15
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