De novo protein structure determination by heavy-atom soaking in lipidic cubic phase and SIRAS phasing using serial synchrotron crystallography

IUCrJ
Sabine BothaC Betzel

Abstract

During the past few years, serial crystallography methods have undergone continuous development and serial data collection has become well established at high-intensity synchrotron-radiation beamlines and XFEL radiation sources. However, the application of experimental phasing to serial crystallography data has remained a challenging task owing to the inherent inaccuracy of the diffraction data. Here, a particularly gentle method for incorporating heavy atoms into micrometre-sized crystals utilizing lipidic cubic phase (LCP) as a carrier medium is reported. Soaking in LCP prior to data collection offers a new, efficient and gentle approach for preparing heavy-atom-derivative crystals directly before diffraction data collection using serial crystallography methods. This approach supports effective phasing by utilizing a reasonably low number of diffraction patterns. Using synchrotron radiation and exploiting the anomalous scattering signal of mercury for single isomorphous replacement with anomalous scattering (SIRAS) phasing resulted in high-quality electron-density maps that were sufficient for building a complete structural model of proteinase K at 1.9 Å resolution using automatic model-building tools.

References

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Citations

Jan 30, 2020·Scientific Reports·Michihiro SugaharaTetsuya Ishikawa
Apr 17, 2021·Protein and Peptide Letters·Chen-Yan ZhangDa-Chuan Yin

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Methods Mentioned

BETA
X-ray

Software Mentioned

REFMAC
SHELXD
PILATUS
Auto
CrystFEL
DM
SHELXC
wARP
MIRAS
HH

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