IR laser-induced protein crystal transformation.

Area of Science:

• Crystallography
• Biophysics
• Materials Science

Background:

• Crystalline phases with improved order are crucial for high-resolution X-ray diffraction.
• Traditional dehydration methods using humidity control can be slow and induce mechanical stress.

Purpose of the Study:

• To develop and test a novel method for inducing phase changes in biomolecular crystals via infrared (IR) light heating.
• To generate crystalline phases with enhanced order and reduced mosaic spread for improved diffraction data.

Main Methods:

• Heating biomolecular crystals using pulsed and/or constant IR laser irradiation.
• Monitoring dehydration and rehydration optically using a video system.
• Comparing IR heating with traditional humidity-controlled dehydration.

Main Results:

• IR light heating proved superior to humidity-controlled dehydration for CODH and CLK2 protein crystals.
• IR heating allows for precise control over phase transition rates by adjusting laser parameters.
• The method impacts crystals instantaneously, isotropically, and homogeneously, minimizing mechanical stress.

Conclusions:

• IR light heating is an effective and experimentally simple method for controlled dehydration and phase transformation in biomolecular crystals.
• This technique offers a broader parameter space for optimizing crystal properties for diffraction studies.
• The method is expected to yield crystals with improved order and reduced mosaic spread, facilitating better data collection.