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Direct-space methods in phase extension and phase refinement. VI. PERP (phase extension and refinement program).

L S Refaat1, C Tate, M M Woolfson

  • 1Physics Department, University of York, England.

Acta Crystallographica. Section D, Biological Crystallography
|November 1, 1996
PubMed
Summary
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The PERP program package enhances macromolecular structure determination by combining multiple phase extension and refinement techniques. Sequential application of these methods yields superior results compared to individual approaches for improved structural accuracy.

Area of Science:

  • Crystallography
  • Structural Biology
  • Computational Chemistry

Background:

  • Macromolecular structure determination relies on accurate phase information.
  • Existing methods for phase extension and refinement have limitations.

Purpose of the Study:

  • To introduce PERP, a program package integrating advanced techniques for macromolecular phase refinement.
  • To evaluate the efficacy of PERP in improving phase accuracy and map quality.

Main Methods:

  • PERP incorporates solvent flattening, histogram matching, Sayre equation, low-density elimination, and double-histogram methods.
  • The package is user-friendly with keyword control and default parameters.
  • Tested on six diverse protein structures for refinement and extension.

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Main Results:

  • PERP demonstrated significant improvements in mean-phase-error and map-correlation coefficient.
  • Satisfactory outcomes were achieved across various protein structures.
  • Sequential application of methods within PERP proved more effective than single techniques.

Conclusions:

  • The PERP package offers a robust solution for macromolecular phase extension and refinement.
  • Combining multiple techniques in sequence is key to achieving optimal structural results.
  • PERP facilitates more accurate and reliable determination of macromolecular structures.