X-CHIP: an integrated platform for high-throughput protein crystallization and on-the-chip X-ray diffraction data...

Area of Science:

• Structural Biology
• Biophysics
• Crystallography

Background:

• Traditional X-ray crystallography involves multiple manual steps, often limiting throughput and requiring cryoprotection.
• Fragment-based screening and protein-complex studies generate large datasets, demanding efficient structural determination methods.

Purpose of the Study:

• To introduce the X-CHIP (X-ray Crystallization High-throughput Integrated Platform), a novel microchip designed to integrate multiple crystallographic pipeline steps.
• To demonstrate the chip's capability for high-throughput crystallization screening, crystal inspection, and in situ X-ray diffraction data collection at room temperature.

Main Methods:

• The X-CHIP utilizes hydrophilic and hydrophobic concentric ring surfaces for a stable microbatch crystallization environment.
• In situ X-ray diffraction data acquisition is performed directly on the chip at room temperature, eliminating manual crystal handling and cryoprotection.
• Nanolitre-scale drop volumes are employed, enhancing resource efficiency.

Main Results:

• High-quality, well-diffracting crystals were grown, and high-resolution diffraction datasets were collected using the X-CHIP.
• Single-wavelength anomalous dispersion data collected at room temperature was sufficient for interpretable electron-density maps.
• The technology demonstrated high-throughput capabilities suitable for large-volume data projects.

Conclusions:

• The X-CHIP streamlines the X-ray structure determination process, offering a promising avenue for full automation.
• This resource-efficient technology is compatible with most beamline systems and beneficial for complex structural biology projects.
• The platform enables efficient screening and data collection, advancing crystallographic throughput.