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Related Experiment Videos

Single Molecule Force Spectroscopy on Polysaccharides by Atomic Force Microscopy

Rief1, Oesterhelt, Heymann

  • 1M. Rief, F. Oesterhelt, H. E. Gaub, Lehrstuhl fur Angewandte Physik, Ludwig-Maximilians-Universitat, 80799 Munchen, Germany. B. Heymann, Theoretische Biophysik, Institut fur Medizinische Optik, Ludwig-Maximilians-Universitat 80333 Munchen, Germany.

Science (New York, N.Y.)
|February 28, 1997
PubMed
Summary
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Single molecule force measurements reveal dextran filament behavior. At low forces, entropic forces dominate, while higher forces induce reversible stiffening due to bond angle changes, confirmed by molecular dynamics.

Area of Science:

  • Biophysics
  • Polymer Physics
  • Nanotechnology

Background:

  • Piconewton instrumentation enables single-molecule force measurements.
  • Understanding polymer elasticity and conformational changes is crucial.

Purpose of the Study:

  • To investigate the mechanical properties and conformational changes of dextran filaments under varying forces.
  • To determine the governing forces and molecular mechanisms behind dextran deformation.

Main Methods:

  • Utilizing atomic force microscopy (AFM) to probe dextran filaments attached to a gold surface.
  • Applying vertical stretching to measure force-deformation relationships.
  • Employing molecular dynamics calculations for corroboration.

Main Results:

Related Experiment Videos

  • At low forces, dextran deformation follows Langevin function, driven by entropic forces with a 6 angstrom Kuhn length.
  • At elevated forces, strand elongation is governed by bond angle twisting.
  • A distinct, reversible conformational change occurs at higher forces, leading to polymer stiffening dominated by bond angle bending.

Conclusions:

  • Dextran filament mechanics are force-dependent, transitioning from entropic to enthalpic contributions.
  • The observed reversible stiffening is attributed to changes in bond angle configurations.
  • Molecular dynamics simulations validate the experimental findings on dextran's mechanical response.