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Related Experiment Videos

Enzyme activity and flexibility at very low hydration.

V Kurkal1, R M Daniel, John L Finney

  • 1Interdisciplinary Center for Scientific Computing (IWR), University of Heidelberg, Germany.

Biophysical Journal
|May 17, 2005
PubMed
Summary

Enzyme activity can occur at very low hydration levels. While increased hydration enhances protein flexibility and motion, it is not essential for enzyme function, suggesting other factors are key.

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Area of Science:

  • Biophysics
  • Enzymology
  • Protein Dynamics

Background:

  • Enzymes exhibit activity at low hydration levels (as low as 3%).
  • The role of hydration-induced enzyme flexibility in enzymatic activity remains unclear.

Purpose of the Study:

  • To investigate the relationship between protein hydration, flexibility, and enzyme activity.
  • To determine if hydration-induced dynamics are essential for enzyme function.

Main Methods:

  • Picosecond dynamic neutron scattering experiments were conducted on pig liver esterase powders.
  • Experiments were performed across a range of hydrations (0%, 3%, 12%, 50%) and temperatures (120 K to 300 K).

Main Results:

  • Significant anharmonic, diffusive motion was observed in the protein at all tested hydrations and temperatures.

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  • Increasing hydration revealed a temperature-dependent dynamical transition with enhanced diffusive motion.
  • The observed protein dynamics indicate flexibility is present even at low hydration levels.

    • Conclusions:

    • Hydration enhances protein diffusive motion and flexibility.
    • While this enhanced motion may correlate with increased activity, it is not a prerequisite for enzyme function.
    • Enzymes can function independently of significant hydration-induced flexibility.