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A Model for Hydration Interactions between Apoferritin Molecules in Solution.

Vesselin N. Paunov1, Eric W. Kaler, Stanley I. Sandler

  • 1Center for Molecular and Engineering Thermodynamics Department of Chemical Engineering, University of Delaware, Newark, Delaware, 19716

Journal of Colloid and Interface Science
|August 3, 2001
PubMed
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Non-DLVO forces influence protein interactions. Hydration forces, driven by ionic exchange, affect apoferritin

Area of Science:

  • Biophysics
  • Physical Chemistry
  • Protein Science

Background:

  • Understanding interprotein forces is crucial for protein behavior in solution.
  • The osmotic second virial coefficient (A2) reflects these interactions.
  • Apoferritin's behavior presents a unique case study for molecular interactions.

Purpose of the Study:

  • To investigate the impact of non-DLVO forces on apoferritin's osmotic second virial coefficient.
  • To model the influence of ionic strength and pH on interprotein interactions.
  • To explain experimental observations of A2 minima in apoferritin solutions.

Main Methods:

  • Development of a theoretical model for interprotein interactions.
  • Analysis of non-DLVO forces, including hydration and Stern layer effects.

Related Experiment Videos

  • Consideration of ionic exchange mechanisms at the protein surface.

    • Main Results:

    • DLVO theory explains initial A2 decrease at low ionic strength.
    • Non-DLVO hydration forces cause A2 to increase at higher ionic strengths.
    • Ionic exchange leads to hydrated sodium ion adsorption, modifying interactions.

    Conclusions:

    • Non-DLVO hydration forces are critical for understanding apoferritin's solution behavior.
    • The model successfully interprets experimental findings on A2 dependence on ionic strength.
    • Ionic exchange at the protein surface plays a significant role in modulating protein-protein interactions.