Fabrication of X-ray compatible microfluidic platforms for protein crystallization

Area of Science:

• Structural Biology
• Biophysics
• Materials Science

Background:

• Traditional protein crystallization methods are often time-consuming and require significant sample volumes.
• Collecting X-ray diffraction data typically involves manual crystal handling, increasing the risk of damage and errors.

Purpose of the Study:

• To develop and validate a microfluidic platform for efficient protein crystallization and in-situ X-ray diffraction data collection.
• To demonstrate the platform's utility for structural determination of soluble proteins.

Main Methods:

• Fabrication of multilayer microfluidic chips using X-ray transparent materials compatible with crystallization reagents.
• On-chip crystallization of lysozyme, thaumatin, and ribonuclease A.
• On-chip X-ray diffraction data collection from multiple crystals in parallel.
• Structure determination using merged diffraction data.

Main Results:

• Successful crystallization and diffraction data collection from three soluble proteins on-chip.
• Demonstration of a microfluidic screening chip that minimizes protein solution consumption.
• High-quality isomorphous protein crystals grown and analyzed in parallel within the chip.
• Room temperature data collection achieved, eliminating crystal handling and reducing radiation damage.

Conclusions:

• The developed microfluidic platform offers an efficient and streamlined approach for protein structure determination.
• This method facilitates high-throughput screening, crystal growth, and X-ray data collection, advancing structural biology research.
• The platform's ability to minimize sample usage and radiation damage holds significant promise for future crystallographic studies.