Whole-pattern fitting technique in serial femtosecond nanocrystallography
Ruben A Dilanian1, Sophie R Williams1, Andrew V Martin1
1ARC Centre of Excellence for Advanced Molecular Imaging, School of Physics, University of Melbourne , Parkville, Victoria 3010, Australia.
Iucrj
|March 24, 2016
Summary
Serial femtosecond X-ray crystallography (SFX) advances protein nanocrystal structure analysis. Whole-pattern fitting of SFX data proves more accurate than current methods for small, imperfect crystals.
Area of Science:
- Structural Biology
- Crystallography
- Biophysics
Background:
- Serial femtosecond X-ray crystallography (SFX) enables structural analysis of protein nanocrystals.
- SFX experiments require analyzing numerous small crystals of varying quality.
- Extracting accurate structure-factor moduli from SFX data is challenging due to crystal size and imperfections.
Purpose of the Study:
- To evaluate whole-pattern fitting techniques for analyzing merged SFX diffraction data.
- To compare the accuracy of whole-pattern fitting with Monte Carlo integration for small crystals.
Main Methods:
- Extension of 1D powder diffraction whole-pattern fitting to higher dimensions for SFX data.
- Analysis of merged serial femtosecond crystallography diffraction data.
- Comparison of whole-pattern fitting and Monte Carlo integration methods.
Main Results:
- Whole-pattern fitting techniques are feasible for analyzing merged SFX data.
- Whole-pattern fitting is more accurate than Monte Carlo integration for very small crystals.
- Demonstrated the effectiveness of whole-pattern fitting for nanocrystal structure determination.
Conclusions:
- Whole-pattern fitting offers a more accurate approach for structure-factor modulus extraction in SFX.
- This method enhances the structural analysis of protein nanocrystals.
- The findings bridge the gap between conventional crystallography and powder diffraction analysis.
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