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Materials: protein single crystal growth under microgravity.

W Littke, C John

    Science (New York, N.Y.)
    |July 13, 1984
    PubMed
    Summary
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    Producing large protein crystals for X-ray crystallography is challenging. Microgravity conditions significantly enhanced crystal size for beta-galactosidase and lysozyme, yielding crystals 27 and 1000 times larger than those grown on Earth.

    Area of Science:

    • Biophysics
    • Crystallography
    • Materials Science

    Background:

    • Protein single crystal preparation is critical for X-ray structure determination.
    • Crystal growth is often limited by terrestrial gravity-induced convection and sedimentation.
    • Developing methods for larger, higher-quality crystals is essential for structural biology.

    Purpose of the Study:

    • To investigate the effect of microgravity on protein single crystal growth.
    • To compare crystal sizes obtained under microgravity versus terrestrial gravity conditions.
    • To assess the potential of microgravity for improving protein crystallography workflows.

    Main Methods:

    • Utilized microgravity conditions to grow single crystals of two model proteins: beta-galactosidase and lysozyme.

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  • Employed a salting out method for crystallization.
  • Maintained solutions free of convection during crystal formation.
  • Compared crystal volumes to those grown simultaneously under terrestrial gravity.

    • Main Results:

    • Successfully produced larger single crystals of beta-galactosidase and lysozyme under microgravity.
    • Microgravity-grown beta-galactosidase crystals were 27 times larger in volume than terrestrial controls.
    • Microgravity-grown lysozyme crystals were 1000 times larger in volume than terrestrial controls.
    • Convection-free conditions in microgravity facilitated enhanced crystal growth.

    Conclusions:

    • Microgravity significantly enhances the size of protein single crystals.
    • The absence of convection in microgravity is a key factor for improved crystal growth.
    • Microgravity offers a promising approach to overcome limitations in protein crystal preparation for structural studies.