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Ensemble refinement of protein crystal structures: validation and application.

Elena J Levin1, Dmitry A Kondrashov, Gary E Wesenberg

  • 1Department of Biochemistry, University of Wisconsin-Madison, Madison, WI 53706, USA.

Structure (London, England : 1993)
|September 14, 2007
PubMed
Summary
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Ensemble refinement using multiple structures improves the representation of macromolecular flexibility in X-ray crystallography. This method enhances atomic position accuracy and is beneficial even for moderate-resolution structures.

Area of Science:

  • Structural biology
  • X-ray crystallography
  • Computational biology

Background:

  • Macromolecular conformations are typically described by single sets of coordinates and B factors in X-ray crystallography.
  • Representing structural flexibility often requires advanced refinement techniques.

Purpose of the Study:

  • To systematically validate ensemble refinement as a method for representing macromolecular flexibility.
  • To compare ensemble refinement with single-conformer refinement using simulated and experimental data.

Main Methods:

  • Simulated X-ray diffraction data were used to test ensemble refinement against single-conformer refinement.
  • Principal component analysis was employed to compare motions captured by simulations and refinements.
  • Ensemble refinement was applied to 50 experimental structures of varying resolutions.

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Main Results:

  • Ensemble refinement provided better representations of atomic position distributions compared to single-conformer refinements for simulated data.
  • Concerted motions were captured locally, but long-distance correlations were less pronounced.
  • Application to experimental structures resulted in decreased R(free) values, indicating improved model quality.

Conclusions:

  • Ensemble refinement is a validated method for accurately representing macromolecular flexibility.
  • The benefits of ensemble refinement are independent of data resolution or data-to-parameter ratio.
  • This technique offers significant improvements for structures, including those at moderate resolution.