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Switchable reinforced streptavidin.

Leonard C Schendel1, Steffen M Sedlak, Hermann E Gaub

  • 1Lehrstuhl für Angewandte Physik and Center for NanoScience, Ludwig-Maximilians-Universität München, Amalienstr. 54, 80799 Munich, Germany. gaub@lmu.de.

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|March 18, 2020
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Summary
This summary is machine-generated.

Researchers engineered streptavidin to create a switchable biotin-binding interaction. This protein engineering approach enhances the mechanical stability of the biotin-streptavidin complex, with potential applications in biotechnology.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Protein Engineering

Background:

  • The biotin-streptavidin complex is crucial for numerous biotechnological applications.
  • Understanding its mechanical properties is vital, especially its dissociation under force.
  • Previous studies identified a low-force dissociation pathway involving N-terminal unfolding.

Purpose of the Study:

  • To engineer a switchable biotin-streptavidin interaction by preventing N-terminal unfolding.
  • To investigate the effect of this engineered disulfide bridge on the complex's mechanical stability.

Main Methods:

  • Introduced mutations (T18C, A33C) to form a disulfide bridge in monovalent streptavidin.
  • Utilized atomic force microscopy-based single-molecule force spectroscopy.
  • Applied reducing and oxidizing agents to control disulfide bridge integrity.

Main Results:

  • Engineered streptavidin showed ~1.5-fold higher unbinding forces (~350 pN) compared to native streptavidin.
  • Addition of reducing agent decreased unbinding forces to ~200 pN by breaking the disulfide bridge.
  • Switching buffer conditions reversibly modulated the unbinding forces.

Conclusions:

  • Protein engineering can effectively tune the mechanics of receptor-ligand interactions.
  • A switchable disulfide bridge can significantly enhance the mechanical stability of the biotin-streptavidin complex.
  • This strategy offers a novel way to control molecular interactions for biotechnological applications.