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Related Experiment Videos

Volumetric study on the protein-anesthetic binding.

M Yamanaka1, S Kaneshina, H Kamaya

  • 1Department of Chemistry, Faculty of Science, Kyushu University, Ropponmatsu, 810-8560, Fukuoka, Japan

Colloids and Surfaces. B, Biointerfaces
|July 5, 2001
PubMed
Summary

Bovine serum albumin (BSA) binding with octanol (C8OH) in water reduces protein volume, indicating hydrophobic interactions are pressure-dependent. This finding contrasts with the pressure reversal of anesthesia.

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Area of Science:

  • Biophysical Chemistry
  • Thermodynamics
  • Protein-Ligand Interactions

Background:

  • Understanding protein-ligand interactions is crucial for various biological and pharmaceutical processes.
  • The volume changes associated with these interactions provide insights into the underlying mechanisms, such as hydrophobic effects.

Purpose of the Study:

  • To derive and apply thermodynamic equations to quantify the volume behavior of protein-ligand mixtures.
  • To determine binding parameters and partial molar volumes for bovine serum albumin (BSA) and octanol (C8OH) in aqueous solutions.

Main Methods:

  • Derivation of thermodynamic equations for volume behavior in protein-ligand mixtures.
  • Integration of equations with a Langmuir-type binding isotherm.
  • Measurement of densities of BSA-C8OH aqueous solutions at varying molalities.

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  • Analysis of density data to estimate partial molar volumes and binding parameters.

    • Main Results:

    • Partial molar volumes of BSA and C8OH were estimated at infinite dilution.
    • BSA's partial molar volume decreased upon C8OH addition.
    • C8OH's partial molar volume decreased with increasing BSA molality.
    • Association constant (K=392 kg mol⁻¹), maximum binding number (bmax=1.9), and volume change (ΔV=-109 cm³ mol⁻¹) for BSA-C8OH interaction were determined.

    Conclusions:

    • The negative volume change (ΔV) suggests hydrophobic interactions reduce protein volume.
    • Increased pressure is inferred to promote BSA-C8OH binding.
    • These findings are inconsistent with the pressure reversal of anesthesia phenomenon.