5HQD image
Entry Detail
PDB ID:
5HQD
Keywords:
Title:
Acoustic injectors for drop-on-demand serial femtosecond crystallography
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2016-01-21
Release Date:
2016-02-10
Method Details:
Experimental Method:
Resolution:
2.52 Å
R-Value Free:
0.28
R-Value Work:
0.21
R-Value Observed:
0.22
Space Group:
P 61 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Thermolysin
Chain IDs:A
Chain Length:316
Number of Molecules:1
Biological Source:Thermus thermophilus
Primary Citation

Abstact

X-ray free-electron lasers (XFELs) provide very intense X-ray pulses suitable for macromolecular crystallography. Each X-ray pulse typically lasts for tens of femtoseconds and the interval between pulses is many orders of magnitude longer. Here we describe two novel acoustic injection systems that use focused sound waves to eject picoliter to nanoliter crystal-containing droplets out of microplates and into the X-ray pulse from which diffraction data are collected. The on-demand droplet delivery is synchronized to the XFEL pulse scheme, resulting in X-ray pulses intersecting up to 88% of the droplets. We tested several types of samples in a range of crystallization conditions, wherein the overall crystal hit ratio (e.g., fraction of images with observable diffraction patterns) is a function of the microcrystal slurry concentration. We report crystal structures from lysozyme, thermolysin, and stachydrine demethylase (Stc2). Additional samples were screened to demonstrate that these methods can be applied to rare samples.

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Primary Citation of related structures