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The application of direct methods and Patterson interpretation to high-resolution native protein data
G M Sheldrick1, Z Dauter, K S Wilson
1Institut für Anorganische Chemie der Universität Göttingen, Germany.
Acta Crystallographica. Section D, Biological Crystallography
|January 1, 1993
Summary
Conventional methods can solve the protein phase problem using only native data. High-resolution data and heavy atoms, like iron in rubredoxin, significantly aid automated Patterson interpretation and direct methods for structure determination.
Area of Science:
- Crystallography
- Structural Biology
- Biophysics
Background:
- Solving the protein phase problem is crucial for determining molecular structures.
- Conventional methods often rely on heavy-atom derivatives or anomalous dispersion.
- This study explores solving the phase problem using only native X-ray diffraction data.
Purpose of the Study:
- To test conventional small-molecule phasing methods on protein native data.
- To evaluate the utility of direct methods and automated Patterson interpretation.
- To assess the impact of data resolution and the presence of heavy atoms.
Main Methods:
- Testing conventional small-molecule phasing methods on 0.9 A resolution native data.
- Applying direct methods and automated Patterson interpretation.
- Utilizing E-Fourier recycling for phase refinement.
Main Results:
- Automated Patterson interpretation successfully identified key structural features (disulfide bridges, FeS4 unit).
- Direct methods showed limited success for crambin but some success for rubredoxin.
- Rubredoxin could be solved by Patterson interpretation down to 1.6 A resolution, while crambin required higher resolution.
Conclusions:
- High-resolution native data is beneficial for protein structure determination.
- The presence of heavy atoms greatly aids automated Patterson interpretation.
- Solving the phase problem from a single native dataset is feasible in favorable cases with atomic resolution data.