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Advances in multiple wavelength anomalous diffraction crystallography.

S E Ealick1

  • 1Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA. see3@cornell.edu

Current Opinion in Chemical Biology
|September 28, 2000
PubMed
Summary
This summary is machine-generated.

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Multiple Wavelength Anomalous Diffraction (MAD) phasing is now the leading method for determining macromolecular structures. Advances in synchrotron technology and software have driven its widespread adoption for solving complex biological molecules.

Area of Science:

  • Structural Biology
  • Biophysics
  • Crystallography

Background:

  • Multiple Wavelength Anomalous Diffraction (MAD) phasing has rapidly evolved from a niche technique to a primary method in structural biology.
  • Historically, MAD phasing was applied to a limited number of macromolecular structure determinations before 1994.

Purpose of the Study:

  • To highlight the significant increase in the application of MAD phasing for solving macromolecular structures.
  • To identify the key technological and computational advancements contributing to the rise of MAD phasing.

Main Methods:

  • The study reviews the advancements in synchrotron beamline technology, including optics, detectors, and user interfaces.
  • It also discusses the development of new computational programs for data analysis and phase calculation in MAD phasing.

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Main Results:

  • MAD phasing applications surged from fewer than a dozen pre-1994 to over 100 in 1999 alone.
  • The technique has been successfully applied to large macromolecular structures, including those with up to 120 selenium atoms.

Conclusions:

  • Technological and software improvements have democratized MAD phasing, making it accessible for a broad range of macromolecular structure determination.
  • The practical size limitations for MAD phasing have not yet been reached, indicating its continued potential for even larger and more complex systems.