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Related Experiment Videos

On the distribution of the bulk-solvent correction parameters.

N M Glykos1, M Kokkinidis

  • 1IMBB, FORTH, PO Box 1527, 71110 Heraklion, Crete, Greece.

Acta Crystallographica. Section D, Biological Crystallography
|August 16, 2000
PubMed
Summary

Bulk-solvent correction parameters (B(sol), k(sol)) show a wider range and lack of correlation with physical meaning in protein crystal structures. Current algorithms struggle to separate these parameters during macromolecular refinement.

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Area of Science:

  • Structural Biology
  • Crystallography
  • Biophysics

Background:

  • Macromolecular refinement relies on bulk-solvent correction parameters (B(sol), k(sol)) to model solvent and B-factors.
  • These parameters are typically assumed to have specific physical meanings and fall within a narrow range.

Purpose of the Study:

  • To analyze the distribution of bulk-solvent correction parameters (B(sol), k(sol)) from a dataset of 219 Protein Data Bank crystal structures.
  • To evaluate the observed range, physical interpretation, and interdependence of these parameters.

Main Methods:

  • Utilized an exponential scaling algorithm based on Babinet's principle to determine B(sol) and k(sol) values.
  • Analyzed the distribution of these parameters across 219 deposited crystal structures.

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Main Results:

  • Observed parameter ranges for B(sol) and k(sol) are significantly wider than commonly cited values.
  • The determined k(sol) values do not consistently correlate with their expected physical interpretations.
  • B(sol) and k(sol) are not independent, and a simple exponential function can achieve reasonable agreement with experimental data.

Conclusions:

  • Current algorithms used in macromolecular refinement are insufficient to independently determine B(sol) and k(sol).
  • The findings suggest a need for re-evaluation of bulk-solvent correction parameterization in crystallographic refinement.