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Related Experiment Videos

Direct-space methods in phase extension and phase refinement. V. The histogram moments method.

Y X Gu1, M M Woolfson, J X Yao

  • 1Physics Department, University of York, Heslington, England.

Acta Crystallographica. Section D, Biological Crystallography
|November 1, 1996
PubMed
Summary

This study introduces a moments method for phase refinement in crystallography. It effectively refines electron density moments in protein regions, improving crystallographic models.

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Area of Science:

  • Crystallography
  • Structural Biology
  • Biophysics

Background:

  • Crystallographic structure determination relies on accurate phase information.
  • Electron density modification is crucial for improving crystallographic models.

Purpose of the Study:

  • To develop and test a novel phase refinement method based on modifying electron density moments.
  • To assess the effectiveness of moment-based refinement in protein and solvent regions.

Main Methods:

  • Utilized Fourier transforms to modify electron density moments in reciprocal space.
  • Applied specific weighting schemes for phase estimates and Fourier coefficients.
  • Tested the method on moderate-sized proteins with and without heavy atoms.

Main Results:

Related Experiment Videos

  • Refinement using the third moment in the protein region proved most effective.
  • Higher moments or refinement in the solvent region did not yield significant improvements.
  • Empirically determined optimal weighting strategies for phase mixture and signal-to-noise ratio.

Conclusions:

  • The moments method offers an independent approach to phase refinement, complementary to real-space histogram-matching techniques.
  • This method can enhance crystallographic refinement packages by improving phase accuracy.