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Conformational memories with variable bond angles.

Robert M Whitnell1, Dow P Hurst, Patricia H Reggio

  • 1Chemistry Department, Guilford College, Greensboro, North Carolina 27410, USA. rwhitnel@guilford.edu

Journal of Computational Chemistry
|September 19, 2007
PubMed
Summary
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Conformational Memories (CM) enhanced by variable bond angles improve protein conformational space sampling. This method efficiently explores biologically relevant conformations, validating experimental findings.

Area of Science:

  • Computational chemistry
  • Molecular modeling
  • Biophysics

Background:

  • Conformational Memories (CM) is a method for exploring peptide and protein dihedral conformational space.
  • Current CM methods primarily vary dihedral angles.

Purpose of the Study:

  • To enhance the Conformational Memories (CM) method by incorporating variable bond angles.
  • To test if including variable bond angles improves conformational space sampling in CM.

Main Methods:

  • Extended CM to include random bond angle variation alongside dihedral angle variation.
  • Tested the enhanced CM method on Met-enkephalin, a proline-containing peptide, and a cannabinoid receptor fragment.
  • Compared results with and without bond angle variation.

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Main Results:

  • Inclusion of variable bond angles allowed sampling of previously inaccessible conformational regions.
  • Observed shifts in conformational populations compared to standard CM.
  • Improved sampling of conformational space was achieved without loss of computational efficiency.

Conclusions:

  • Variable bond angles enhance CM's ability to explore peptide and protein conformational landscapes.
  • The improved sampling facilitates better identification of experimentally validated, biologically relevant conformations.