Serial femtosecond X-ray crystallography (SFX) has revolutionized atomic-resolution structural investigation by expanding applicability to micrometer-sized protein crystals, even at room temperature, and by enabling dynamics studies. However, reliable crystal-carrying media for SFX are lacking. Here we introduce a grease-matrix carrier for protein microcrystals and obtain the structures of lysozyme, glucose isomerase, thaumatin and fatty acid–binding protein type 3 under ambient conditions at a resolution of or finer than 2 Å.
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The XFEL experiments were carried out at the BL3 of SACLA with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (proposal nos. 2012B8036, 2013A8039, 2013A8040, 2013B8044, 2013B8045 and 2014A8032). This work was supported by RIKEN, by the X-ray Free-Electron Laser Priority Strategy Program (MEXT) and partly by Research Acceleration Program of Japan Science and Technology Agency. The sample preparation of FABP3 was supported by the JST-ERATO Murata Lipid Active Structure Project. The authors thank the SACLA beamline staff for technical assistance, K. Diederichs for help with data analysis and A. Nisbet for careful reading of the manuscript.
The authors declare no competing financial interests.
Integrated supplementary information
(a) lysozyme, (b) glucose isomerase, (c) thaumatin and (d) FABP3 crystals. Scale bars represent 20 μm.
(a) A typical diffraction pattern from an individual microcrystal. Resolution at the edges corresponds to ~1.6 Å. (b) A close-up view of glucose isomerase structure with (2Fo – Fc) electron-density map (contoured at 1.0σ). This figure was drawn with the program PyMol (http://www.pymol.org).
Supplementary Figures 1 and 2 and Supplementary Tables 1 and 2
The crystal solution was dispensed into mineral oil–based grease, and then mixed. The crystal-containing grease was inserted into a dispenser tip. After the tip was centrifuged, the sample was loaded into a syringe. The grease produced a stable flow during the SFX experiment. (AVI 10763 kb)
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Sugahara, M., Mizohata, E., Nango, E. et al. Grease matrix as a versatile carrier of proteins for serial crystallography. Nat Methods 12, 61–63 (2015). https://doi.org/10.1038/nmeth.3172
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