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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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On the relationship between diffraction patterns and motions in macromolecular crystals.

Peter B Moore1

  • 1Department of Chemistry, Yale University, New Haven, CT 06520-8107, USA. peter.moore@yale.edu

Structure (London, England : 1993)
|October 20, 2009
PubMed
Summary

New methods improve macromolecular crystal structures by modeling molecular motion. However, these translation, libration, screw-axis (TLS) models require validation against diffuse scatter data for accuracy.

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Area of Science:

  • Structural biology
  • Crystallography
  • Biophysics

Background:

  • Recent advancements in macromolecular crystallography utilize new methods to account for molecular motion and disorder.
  • Translation, libration, screw-axis (TLS) parameterization is a key technique that models these effects as rigid-body domain motions.
  • TLS models often provide biochemically relevant insights into macromolecular behavior.

Purpose of the Study:

  • To highlight the importance of validating TLS models.
  • To emphasize the need for consistency between TLS models and diffuse scatter data.
  • To caution against the uncritical acceptance of TLS-derived molecular motion models.

Main Methods:

  • Analysis of macromolecular diffraction data.
  • Application of translation, libration, screw-axis (TLS) parameterization.
  • Examination of diffuse scatter patterns produced by crystals.

Main Results:

  • TLS parameterization effectively rationalizes molecular motion and disorder in diffraction data.
  • Emergent TLS models frequently align with biochemical expectations.
  • A critical gap exists in validating these models against diffuse scatter.

Conclusions:

  • While TLS parameterization enhances crystal structure quality and offers biochemical insights, its derived motion models require rigorous validation.
  • Consistency with diffuse scatter is crucial for confirming the accuracy of TLS-based molecular motion interpretations.
  • Caution is advised when interpreting TLS models until their agreement with diffuse scatter is established.