Protein crystallization in space

Area of Science:

• Biophysics
• Crystallography
• Space Science

Background:

• Protein crystallization is crucial for structural biology.
• Microgravity offers a unique environment for crystal growth.
• Previous studies suggested space conditions benefit protein crystal quality.

Purpose of the Study:

• To investigate the effects of microgravity on protein crystal growth.
• To assess the quality of protein crystals grown in space.
• To compare space-grown crystals with terrestrial controls.

Main Methods:

• Protein crystallization experiments conducted on the FSW-2 Chinese re-entry satellite in August 1992.
• Utilized a tube-like crystallization apparatus at a controlled temperature (18.5 +/- 0.5°C).
• Grew crystals of 10 different proteins, with a focus on hen-egg white lysozyme and acidic phospholipase A2.

Main Results:

• Over half of the 48 samples from 6 proteins successfully produced crystals in microgravity.
• Observed significant improvements in crystal size, external perfection, morphology, internal order, and nucleation for specific proteins.
• Positive microgravity effects were also noted in experiments using gelled solutions with lysozyme and phospholipase A2.

Conclusions:

• Microgravity environment in space is beneficial for growing high-quality protein crystals.
• Specific protein enzymes, including lysozyme and phospholipase A2, showed enhanced crystallization characteristics.
• Further structural analysis of space-grown crystals is ongoing to confirm these findings.