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PRISM: application to the solution of two protein structures.

C Bystroff1, D Baker, R J Fletterick

  • 1Howard Hughes Medical Institute and the Department of Biochemistry and Biophysics, University of California, San Francisco 94143-0448, USA.

Acta Crystallographica. Section D, Biological Crystallography
|September 1, 1993
PubMed
Summary

This study introduces iterative skeletonization, a novel protein crystallography phase refinement method. It significantly improves structural model interpretability in complex molecular replacement and single isomorphous replacement problems.

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Area of Science:

  • Structural biology
  • Protein crystallography
  • Biophysics

Background:

  • Protein structures are essential for understanding biological function.
  • Accurate phase determination is critical in X-ray crystallography.
  • Existing phase refinement methods have limitations.

Purpose of the Study:

  • To apply a novel phase refinement strategy based on protein chain connectivity.
  • To test the method's efficacy in molecular replacement and single isomorphous replacement.
  • To improve the interpretability of electron density maps in protein crystallography.

Main Methods:

  • Iterative skeletonization exploiting protein chain linearity.
  • Application to molecular replacement (ecotin-trypsin complex) and single isomorphous replacement (apolipoprotein E).

Related Experiment Videos

  • Comparison with solvent flattening and non-crystallographic symmetry averaging.

    • Main Results:

    • Iterative skeletonization outperformed solvent flattening and symmetry averaging in reducing the free R factor for the ecotin-trypsin complex.
    • Protecting existing model density improved refinement performance.
    • The combined skeletonization and solvent flattening approach significantly reduced phase error for apolipoprotein E, surpassing solvent flattening alone.
    • Final electron density maps were readily interpretable for both tested complexes.

    Conclusions:

    • Iterative skeletonization is an effective phase refinement technique in protein crystallography.
    • The method enhances structural model quality, particularly for challenging datasets.
    • This approach offers a significant improvement over traditional phase refinement methods.