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Direction Matters: Monovalent Streptavidin/Biotin Complex under Load.

Steffen M Sedlak1, Leonard C Schendel1, Marcelo C R Melo

  • 1Lehrstuhl für Angewandte Physik and Center for NanoScience (CeNS) , Ludwig-Maximilians-Universität München , Amalienstrasse 54 , 80799 Munich , Germany.

Nano Letters
|October 23, 2018
PubMed
Summary

The force required to detach biotin from streptavidin depends on how the force is applied. C-terminal attachment of streptavidin results in higher rupture forces compared to N-terminal attachment.

Keywords:
Streptavidin/biotinatomic force microscopymachine learningmolecular dynamicssingle-molecule force spectroscopy

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Area of Science:

  • Biophysics
  • Biochemistry
  • Materials Science

Background:

  • The biotin/streptavidin complex is a widely used tool in molecular biology and biotechnology.
  • Understanding its mechanical properties under force is crucial for various applications.
  • Previous studies reported a wide range of rupture forces, suggesting variability in experimental conditions.

Purpose of the Study:

  • To investigate the influence of force application geometry on the mechanical stability of the monovalent biotin/streptavidin complex.
  • To elucidate the underlying mechanisms of unbinding using a combination of experimental and computational approaches.
  • To reconcile the diverse rupture forces reported in the literature.

Main Methods:

  • Single-molecule force spectroscopy using atomic force microscopy (AFM).
  • Site-specific tethering strategies for precise control over complex orientation.
  • Steered molecular dynamics (SMD) simulations.
  • Machine learning techniques to analyze simulation data.

Main Results:

  • Mechanical stability of the biotin/streptavidin complex is highly sensitive to the geometry of force application.
  • Unbinding forces for C-terminal tethered monovalent streptavidin were significantly higher (beyond 400 pN at 10 nN/s loading rate) than for N-terminal tethering.
  • SMD simulations revealed distinct force propagation pathways and identified partial unfolding of the streptavidin N-terminal region prior to biotin release, depending on the force geometry.

Conclusions:

  • The geometry of force application is a critical determinant of the biotin/streptavidin complex's rupture force.
  • Site-specific attachment and advanced computational methods provide deeper insights into complex mechanics.
  • Findings necessitate a re-evaluation of previously reported rupture force data for this system.