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Related Experiment Videos

OASIS and molecular-replacement model completion.

Yao He1, De-Qiang Yao, Yuan-Xin Gu

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China.

Acta Crystallographica. Section D, Biological Crystallography
|June 22, 2007
PubMed
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A new dual-space molecular replacement method improves protein structure determination by refining phases using the OASIS program. This approach efficiently solves the

Area of Science:

  • Crystallography
  • Structural Biology
  • Computational Chemistry

Background:

  • Molecular replacement (MR) is crucial for solving protein structures.
  • Phase determination remains a bottleneck in crystallographic structure solution.
  • Existing MR methods can struggle with completing partial models.

Purpose of the Study:

  • To introduce and evaluate a novel dual-space MR model completion method.
  • To enhance phase refinement efficiency in crystallographic model building.
  • To address the '0-2pi' phase problem in structure determination.

Main Methods:

  • Utilized ARP/wARP for initial model building.
  • Employed REFMAC and DM for structure refinement.
  • Developed and applied the OASIS program for reciprocal-space phase refinement.

Related Experiment Videos

  • Redefined direct-method probability formulas for phase ambiguity resolution.

    • Main Results:

    • The dual-space MR-model completion method significantly improves efficiency compared to methods without OASIS.
    • Phase refinement using OASIS effectively reduces the '0-2pi' phase problem to a sign problem.
    • The method demonstrated success on protein diffraction data lacking anomalous signals (SAD/SIR).

    Conclusions:

    • The proposed dual-space MR-model completion with OASIS offers a more efficient approach to protein structure determination.
    • The redefined phase refinement strategy is effective in improving phase accuracy.
    • This method provides a valuable tool for advancing crystallographic structure solution.