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Solvent behaviour in flash-cooled protein crystals at cryogenic temperatures
M Weik1, G Kryger, A M Schreurs
1Department of Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands. weik@ibs.fr
Summary
Flash-cooled protein crystals reveal solvent behavior critical for storage. Solvent in large channels crystallizes around 155 K, unlike solvent in narrow channels, impacting protein crystal handling and stability.
Area of Science:
- Structural Biology
- Biophysics
- Crystallography
Background:
- Understanding solvent behavior in flash-cooled protein crystals is crucial for cryo-crystallography.
- Solvent mobility and phase transitions significantly influence crystal stability and data quality.
Purpose of the Study:
- To investigate the temperature-dependent solvent behavior in flash-cooled protein crystals.
- To determine the crystallization and glass transition points of solvent within protein crystal channels.
Main Methods:
- X-ray diffraction was employed to study flash-cooled protein crystals.
- Temperature was varied within the range of 100--180 K to observe structural changes.
Main Results:
- Solvent in large channels crystallizes at 155 K, exhibiting behavior similar to bulk water.
- Solvent confined to narrow channels or cavities does not crystallize within the studied temperature range.
- Flash-cooled protein crystals remain in a metastable state up to at least 155 K.
Conclusions:
- Solvent behavior differs significantly based on channel size within protein crystals.
- The findings establish an upper temperature limit for protein crystal storage and handling.
- This research informs crystal annealing strategies and the study of protein dynamics and radiation damage.