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Decrease in stability of human albumin with increase in protein concentration.

P D Ross1, A Shrake

  • 1Laboratory of Molecular Biology, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland 20892.

The Journal of Biological Chemistry
|August 15, 1988
PubMed
Summary
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Protein concentration affects human albumin stability. Higher concentrations decrease stability by promoting unfolding via reversible polymerization, while fatty acid binding influences denaturation patterns.

Area of Science:

  • Biochemistry
  • Protein Chemistry
  • Thermodynamics

Background:

  • Human albumin stability is crucial for its physiological functions.
  • Protein concentration and ligand binding can influence protein denaturation.
  • Differential scanning calorimetry (DSC) is a key technique for studying protein stability.

Purpose of the Study:

  • To investigate the effect of protein concentration on the thermal stability of defatted and undefatted human albumin.
  • To elucidate the role of reversible polymerization in albumin denaturation.
  • To determine if the biphasic denaturation of undefatted albumin is a true thermodynamic phenomenon.

Main Methods:

  • Differential scanning calorimetry (DSC) was used to monitor the denaturation temperature (Td) of human albumin.

Related Experiment Videos

  • Experiments were conducted with varying concentrations of defatted and undefatted human albumin.
  • Data were analyzed using a model incorporating reversible polymerization and ligand redistribution.

    • Main Results:

    • For defatted albumin, Td decreased with increasing protein concentration, consistent with polymerization of denatured monomer.
    • Undefatted albumin exhibited biphasic denaturation: Td of LCFA-poor species decreased with concentration, while Td of LCFA-rich species was concentration-independent.
    • The concentration dependence of Td correlated with the extent of monomer polymerization, which decreased with increased fatty acid binding.

    Conclusions:

    • Reversible polymerization of denatured monomer influences albumin stability, particularly at higher concentrations.
    • The biphasic denaturation of undefatted albumin is a true thermodynamic property, influenced by long-chain fatty acid (LCFA) redistribution.
    • Ligand binding significantly modulates the concentration-dependent denaturation behavior of human albumin.