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Related Experiment Videos

Density constraints and low-resolution phasing.

A G Urzhumtsev1, N L Lunina, T P Skovoroda

  • 1LCM3B, UPRESA 7036 CNRS, Faculté des Sciences, Université Henri Poincaré Nancy I, 54506 Vandoeuvre-lès-Nancy, France. sacha@lcm3b.u-nancy.fr

Acta Crystallographica. Section D, Biological Crystallography
|September 22, 2000
PubMed
Summary
This summary is machine-generated.

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Direct phasing requires additional information to select correct phase sets. This study uses electron density constraints, like histograms, to reject incorrect solutions and refine phase sets for crystallography.

Area of Science:

  • Crystallography
  • Computational Chemistry

Background:

  • Direct phasing in crystallography requires additional information to resolve phase ambiguities.
  • Electron density values offer a potential source for such constraints.

Purpose of the Study:

  • To analyze the utility of electron density-based constraints in direct phasing.
  • To evaluate the effectiveness of histograms and connectivity properties in density modification.

Main Methods:

  • Implementation of one- and multi-dimensional histograms as constraints.
  • Utilizing connectivity properties within density-modification procedures.
  • Application of cluster analysis and averaging on remaining phase variants.

Main Results:

  • Electron density constraints, including histograms and connectivity, aid in rejecting incorrect phase sets.

Related Experiment Videos

  • These methods do not always unambiguously select the best solution.
  • Cluster analysis and averaging of valid solutions provide a foundation for phase refinement.

    • Conclusions:

    • Electron density constraints are valuable for improving direct phasing accuracy by eliminating erroneous solutions.
    • Combined with cluster analysis, these methods offer a robust starting point for advanced phase refinement in crystallography.