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Helical structures in proteins.

J P Kemp1, J Z Chen

  • 1Guelph-Waterloo Physics Institute, Department of Physics, University of Waterloo, Waterloo, Ontario, Canada, N2L 3G1.

Biomacromolecules
|December 26, 2001
PubMed
Summary
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This study models helix-forming polymers, revealing four distinct states during coil-helix transitions. Polymer foldability strongly depends on anisotropic interactions, influencing transition order.

Area of Science:

  • Polymer Physics
  • Biophysics
  • Computational Chemistry

Background:

  • Helix-forming polymers are crucial in biological systems, mimicking protein structures.
  • Understanding the coil-helix transition is key to polymer folding and function.

Purpose of the Study:

  • To investigate a minimal model for helix-forming polymers.
  • To elucidate the role of monomer-monomer potential energy in coil-helix transitions.
  • To analyze the impact of potential anisotropy on polymer folding and transition order.

Main Methods:

  • Utilized a minimal polymer model with anisotropic monomer-monomer potentials.
  • Incorporated a wormlike polymer backbone model.
  • Systematically varied potential anisotropy from isotropic to strongly anisotropic.

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Main Results:

  • Identified four distinct states: coil, collapsed globular, flexible helical, and crystalline helical.
  • Demonstrated that helix foldability is strongly correlated with potential anisotropy.
  • Showed that isotropic potentials lead to non-first-order transitions after globular collapse.

Conclusions:

  • The anisotropic nature of monomer interactions is critical for helix formation and stability.
  • The coil-helix transition is complex and highly sensitive to potential energy details.
  • Cooperative, first-order-like behavior is observed in the globular-helix transition for anisotropic potentials.