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Related Experiment Videos

Phasing the AP2 core complex with Xe, Hg and Se.

Philip Evans1

  • 1MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 2QH, England. pre@mrc-lmb.cam.ac.uk

Acta Crystallographica. Section D, Biological Crystallography
|October 24, 2003
PubMed
Summary
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Xenon derivatives provided the best phasing for the AP2 clathrin adaptor complex. Retrospective analysis determined optimal derivative data sets for structural determination, highlighting wavelength-dependent anomalous signal enhancement.

Area of Science:

  • Structural biology
  • Biochemistry
  • Crystallography

Background:

  • The AP2 complex is a heterotetrameric clathrin adaptor crucial for protein trafficking.
  • Determining the structure of large protein complexes requires robust phasing methods.

Purpose of the Study:

  • To evaluate the effectiveness of different heavy atom derivatives for phasing the AP2 clathrin adaptor complex.
  • To identify optimal derivative datasets and wavelengths for successful crystallographic structure determination.

Main Methods:

  • Crystallographic data collection using xenon, mercury, and selenomethionine derivatives.
  • Anomalous scattering and multiwavelength anomalous diffraction (MAD) phasing techniques.
  • Retrospective analysis of derivative data contributions.

Related Experiment Videos

Main Results:

  • Xenon derivatives at long wavelengths provided the most significant phasing power by enhancing anomalous signals.
  • Mercury derivatives offered a useful, albeit lesser, contribution to phasing.
  • Suboptimal datasets, particularly a second wavelength mercury set, proved detrimental, likely due to radiation damage.
  • Selenomethionine (SeMet) derivatives were less effective for initial phasing due to incomplete selenium incorporation but aided in chain tracing.

Conclusions:

  • Wavelength selection is critical for maximizing anomalous signal in heavy atom derivative phasing.
  • Careful selection and quality control of derivative datasets are essential for efficient structure solution.
  • Xenon derivatives are highly effective for phasing complex protein structures like the AP2 complex.