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Model for stretching elastic biopolymers which exhibit conformational transformations.

R G Haverkamp1, A T Marshall, M A K Williams

  • 1Institute of Technology and Engineering, Massey University, Palmerston North 5331, New Zealand. r.haverkamp@massey.ac.nz

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 16, 2007
PubMed
Summary

We developed a new model to describe how polysaccharide molecules stretch, including ring transformations. This model accurately predicts polymer behavior and helps determine energy changes during stretching.

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Area of Science:

  • Polymer Physics
  • Biochemistry
  • Materials Science

Background:

  • Polysaccharides exhibit complex mechanical behavior when subjected to force.
  • Existing models often simplify or overlook force-induced conformational changes in glycan rings.

Purpose of the Study:

  • To derive a physical expression for polysaccharide stretching, incorporating ring conformational transformations.
  • To develop a model that adapts existing frameworks to include multiple force-induced glycan ring changes.

Main Methods:

  • The model is based on the equilibrium between 'clicked' (longer) and 'unclicked' states, governed by Gibbs energy differences.
  • Force-extension curves are generated using the derived expression to simulate polymer behavior.
  • The model is validated by fitting experimental force-extension data of various polysaccharides.

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Main Results:

  • The derived expression accurately represents polysaccharide stretching, including entropic, transitional, and Hookean regimes.
  • The model illustrates how Gibbs energy differences influence the shape of force-extension curves.
  • Good agreement was achieved between the model and experimental data for carboxymethylamylose, dextran, alginate, and pectin.

Conclusions:

  • The developed model provides a robust framework for understanding polysaccharide mechanics under force.
  • It enables the quantification of energy landscapes associated with force-induced conformational changes in polysaccharides.
  • This approach offers valuable insights for designing and manipulating polysaccharide-based materials.