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Related Experiment Videos

Ab initio phasing using molecular envelope from solution X-ray scattering.

Q Hao1, F E Dodd, J G Grossmann

  • 1Department of Chemistry and Physics, De Montfort University, Leicester LE1 9BH, England. qhao@dmu.ac.uk

Acta Crystallographica. Section D, Biological Crystallography
|March 25, 1999
PubMed
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This study introduces a novel method for crystallographic structure determination by using low-resolution molecular shape from X-ray scattering data. This approach aids in solving the phase problem, accelerating protein structure analysis.

Area of Science:

  • Structural Biology
  • Crystallography
  • Biophysics

Background:

  • Solving the crystallographic phase problem is essential for determining protein structures.
  • Traditional methods like MIR, SIR, and molecular replacement have limitations.
  • Low-resolution molecular shape provides valuable structural information.

Purpose of the Study:

  • To present a new method for molecular searching using low-resolution molecular shape data.
  • To overcome limitations of traditional crystallographic phase determination techniques.
  • To validate the method with experimental diffraction data.

Main Methods:

  • Utilizing low-resolution molecular shape from solution X-ray scattering data.
  • Performing a direct real-space search for orientation and translation.

Related Experiment Videos

  • Employing a self-rotation function to determine non-crystallographic axis orientation.

    • Main Results:

    • The method successfully located the molecular shape within the crystallographic unit cell.
    • A direct four-dimensional search yielded a clear solution for nitrite reductase (NiR).
    • The resulting electron-density map showed good agreement with the known structure.

    Conclusions:

    • Low-resolution molecular shape is a viable tool for molecular searching in crystallography.
    • This method offers a promising alternative for solving the phase problem.
    • The approach can potentially be used for phase extension using maximum-entropy methods.