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An automatic method to generate force-field parameters for hetero-compounds.

Kristina Nilsson1, David Lecerof, Emma Sigfridsson

  • 1Department of Theoretical Chemistry, Chemical Centre, University of Lund, PO Box 124, S-221 00 Lund, Sweden.

Acta Crystallographica. Section D, Biological Crystallography
|January 30, 2003
PubMed
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Hess2FF automatically creates parameter files for crystallographic refinement, improving structural accuracy and reproducibility. This method enhances protein structure determination by refining force fields, leading to better results.

Area of Science:

  • Structural Biology
  • Computational Chemistry
  • Biophysics

Background:

  • Crystallographic refinement relies on accurate force fields for molecular models.
  • Generating appropriate parameter and topology files for novel or complex molecules can be challenging.

Purpose of the Study:

  • To develop an automated program (Hess2FF) for constructing parameter and topology files for crystallographic refinement.
  • To assess the impact of Hess2FF-generated files on the quality and accuracy of refined protein structures.

Main Methods:

  • Hess2FF utilizes Hessian (force-constant) matrices to generate refinement files.
  • The program was tested on five diverse protein systems with various hetero-compounds.
  • Re-refinement was performed using Hess2FF-generated files, and results were compared to original structures.

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Main Results:

  • The Hess2FF program successfully generated parameter and topology files for diverse molecules.
  • Re-refinement consistently led to a decrease in the free R(free) factor, indicating improved structural models.
  • A notable improvement was observed in the refinement of cyctochrome c(553), making a lower-resolution structure more consistent with a high-resolution one.

Conclusions:

  • The force field significantly influences crystallographic refinement outcomes and should be published with structural data.
  • Hess2FF provides a valuable tool for automating the generation of refinement files, enhancing reproducibility.
  • Assigning unique atom types to each atom, as facilitated by Hess2FF, appears to be a favorable strategy for parameterization.