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Related Experiment Videos

Biomolecular cryocrystallography: structural changes during flash-cooling.

Bertil Halle1

  • 1Department of Biophysical Chemistry, Lund University, SE-22100 Lund, Sweden. bertil.halle@bpc.lu.se

Proceedings of the National Academy of Sciences of the United States of America
|March 31, 2004
PubMed
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Flash-cooling protein crystals for structural analysis may introduce artifacts. Rapid cooling can trap molecules in non-physiological states, affecting biological relevance and potentially causing cryoartifacts in structural biology.

Area of Science:

  • Structural biology
  • Biophysics
  • Cryo-electron microscopy

Background:

  • Biological macromolecular structures are often determined at cryogenic temperatures to minimize radiation damage.
  • The assumption is that flash-cooling preserves room-temperature equilibrium states.

Purpose of the Study:

  • To investigate the impact of rapid cooling on protein crystal structures.
  • To assess the validity of the room-temperature equilibrium assumption in cryo-cooled samples.

Main Methods:

  • Utilized a two-state model to simulate structural changes during rapid cooling.
  • Calculated expected structural alterations in a typical protein crystal.

Main Results:

  • Analysis indicates significant quenching of degrees of freedom near 200 K.

Related Experiment Videos

  • Local conformational and association equilibria shift towards low-enthalpy states during flash-cooling.
  • Identified potential cryoartifacts in solvent-coupled processes like hydration and ligand binding.

    • Conclusions:

    • Flash-cooling may not always kinetically trap protein crystals in their physiological room-temperature state.
    • Cryoartifacts can arise from dynamic quenching, impacting the interpretation of structural data.
    • The findings have implications for understanding protein dynamics and solvent interactions in cryo-structures.