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Monodisperse measurement of the biotin-streptavidin interaction strength in a well-defined pulling geometry

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  • Steffen M Sedlak
  • Magnus S Bauer
  • Carleen Kluger
  • Leonard C Schendel
  • Lukas F Milles
  • Diana A Pippig
  • Hermann E Gaub

Abstract

The widely used interaction of the homotetramer streptavidin with the small molecule biotin has been intensively studied by force spectroscopy and has become a model system for receptor ligand interaction. However, streptavidin’s tetravalency results in diverse force propagation pathways through the different binding interfaces. This multiplicity gives rise to polydisperse force spectroscopy data. Here, we present an engineered monovalent streptavidin tetramer with a single cysteine in its functional subunit that allows for site-specific immobilization of the molecule, orthogonal to biotin binding. Functionality of streptavidin and its binding properties for biotin remain unaffected. We thus created a stable and reliable molecular anchor with a unique high-affinity binding site for biotinylated molecules or nanoparticles, which we expect to be useful for many single-molecule applications. To characterize the mechanical properties of the bond between biotin and our monovalent streptavidin, we performed force spectroscopy experiments using an atomic force microscope. We were able to conduct measurements at the single-molecule level with 1:1-stoichiometry and a well-defined geometry, in which force exclusively propagates through a single subunit of the streptavidin tetramer. For different force loading rates, we obtained narrow force distributions of the bond rupture forces ranging from 200 pN at 1,500 pN/s to 230 pN at 110,000 pN/s. The data are in very good agreement with the standard Bell-Evans model with a single potential barrier at Δx0 = 0.38 nm and a zero-force off-rate koff,0 in the 10−6 s-1 range.

Suggested Citation

  • Steffen M Sedlak & Magnus S Bauer & Carleen Kluger & Leonard C Schendel & Lukas F Milles & Diana A Pippig & Hermann E Gaub, 2017. "Monodisperse measurement of the biotin-streptavidin interaction strength in a well-defined pulling geometry," PLOS ONE, Public Library of Science, vol. 12(12), pages 1-16, December.
  • Handle: RePEc:plo:pone00:0188722
    DOI: 10.1371/journal.pone.0188722
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    References listed on IDEAS

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    1. R. Merkel & P. Nassoy & A. Leung & K. Ritchie & E. Evans, 1999. "Energy landscapes of receptor–ligand bonds explored with dynamic force spectroscopy," Nature, Nature, vol. 397(6714), pages 50-53, January.
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