5XFE image
Entry Detail
PDB ID:
5XFE
Keywords:
Title:
Luciferin-regenerating enzyme solved by SAD using XFEL (refined against 11,000 patterns)
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2017-04-10
Release Date:
2017-08-30
Method Details:
Experimental Method:
Resolution:
1.50 Å
R-Value Free:
0.21
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Luciferin regenerating enzyme
Chain IDs:A
Chain Length:311
Number of Molecules:1
Biological Source:Photinus pyralis
Primary Citation
Experimental phase determination with selenomethionine or mercury-derivatization in serial femtosecond crystallography
IUCrJ 4 639 647 (2017)
PMID: 28989719 DOI: 10.1107/S2052252517008557

Abstact

Serial femtosecond crystallography (SFX) using X-ray free-electron lasers (XFELs) holds enormous potential for the structure determination of proteins for which it is difficult to produce large and high-quality crystals. SFX has been applied to various systems, but rarely to proteins that have previously unknown structures. Consequently, the majority of previously obtained SFX structures have been solved by the molecular replacement method. To facilitate protein structure determination by SFX, it is essential to establish phasing methods that work efficiently for SFX. Here, selenomethionine derivatization and mercury soaking have been investigated for SFX experiments using the high-energy XFEL at the SPring-8 Angstrom Compact Free-Electron Laser (SACLA), Hyogo, Japan. Three successful cases are reported of single-wavelength anomalous diffraction (SAD) phasing using X-rays of less than 1 Å wavelength with reasonable numbers of diffraction patterns (13 000, 60 000 and 11 000). It is demonstrated that the combination of high-energy X-rays from an XFEL and commonly used heavy-atom incorporation techniques will enable routine de novo structural determination of biomacromolecules.

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