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Viscosity-dependent protein dynamics.

Ilya J Finkelstein1, Aaron M Massari, M D Fayer

  • 1Department of Chemistry, Stanford University, Stanford, California, USA.

Biophysical Journal
|April 21, 2007
PubMed
Summary
This summary is machine-generated.

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Fast protein dynamics in hemoglobin and myoglobin variants are sensitive to solution viscosity. Increasing viscosity with fructose shifted protein dynamics towards behavior seen in sugar glasses.

Area of Science:

  • Biophysics
  • Protein Dynamics
  • Spectroscopy

Background:

  • Understanding protein dynamics is crucial for comprehending their function.
  • The influence of solution viscosity on protein dynamics is not fully understood.
  • Heme proteins like hemoglobin and myoglobin are vital for biological processes.

Purpose of the Study:

  • To investigate how bulk solution viscosity affects fast protein dynamics.
  • To examine this effect in four specific heme proteins: hemoglobin, myoglobin, H64V myoglobin mutant, and M61A cytochrome c552 mutant.
  • To analyze the protein dynamics using a viscoelastic relaxation model.

Main Methods:

  • Spectrally resolved stimulated vibrational echo spectroscopy was employed.
  • Fructose was used to systematically increase solution viscosity over several orders of magnitude.

Related Experiment Videos

  • A near-infrared spectroscopic method was developed to accurately measure solution viscosity.

    • Main Results:

    • Fast protein dynamics were found to be sensitive to changes in solution viscosity.
    • Protein dynamics approached the behavior observed in room temperature sugar glasses at high viscosities.
    • A viscoelastic relaxation model provided a qualitative but not quantitative description of the observed dynamics.

    Conclusions:

    • Solution viscosity significantly influences the fast dynamics of globular heme proteins.
    • The protein dynamics exhibit a transition towards a more rigid state with increasing viscosity.
    • Further refinement of theoretical models is needed for a quantitative understanding of viscosity-dependent protein dynamics.