A microfluidic approach for protein structure determination at room temperature via on-chip anomalous diffraction

Area of Science:

• Structural Biology
• Biochemistry
• Microfluidics

Background:

• Determining protein structures is crucial for understanding biological functions.
• Traditional methods for protein crystallization and X-ray diffraction can be time-consuming and challenging.
• Advancements in microfluidic technologies offer potential for improving these processes.

Purpose of the Study:

• To develop and demonstrate a microfluidic platform for de novo protein structure determination.
• To integrate protein crystallization screening, optimization, and X-ray diffraction data collection on a single chip.
• To showcase the effectiveness of this approach for solving challenging protein structures.

Main Methods:

• A novel microfluidic device was designed for automated protein crystallization screening and optimization.
• On-chip X-ray diffraction data collection was performed using the microfluidic platform.
• Anomalous diffraction data was collected for structure determination.

Main Results:

• The microfluidic approach enabled efficient crystallization screening and optimization.
• High-quality X-ray diffraction data was collected on-chip.
• The structure of phosphonoacetate hydrolase (PhnA) was successfully solved to 2.11 Å resolution.
• The collected anomalous data exhibited significantly lower mosaicity compared to traditional methods.

Conclusions:

• Microfluidics provides a powerful platform for accelerating de novo protein structure determination.
• On-chip data collection reduces experimental time and improves data quality.
• This integrated approach has the potential to revolutionize structural biology workflows.