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Related Experiment Videos

Ligand-induced biphasic protein denaturation.

A Shrake1, P D Ross

  • 1Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, Maryland 20892.

The Journal of Biological Chemistry
|March 25, 1990
PubMed
Summary

Ligand binding can cause proteins to unfold in two distinct steps, even without complex structures. This ligand-induced biphasic denaturation is driven by changes in ligand concentration during protein unfolding.

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Area of Science:

  • Biophysics
  • Biochemistry
  • Thermodynamics

Background:

  • Protein denaturation is often studied using thermal methods like differential scanning calorimetry.
  • Ligand binding can significantly influence protein stability and unfolding thermodynamics.
  • Understanding coupled equilibria is crucial for interpreting protein behavior.

Purpose of the Study:

  • To present thermodynamic calculations of excess heat capacity during protein denaturation.
  • To investigate the effect of ligand binding on two-state thermal denaturation.
  • To explain the origins of bimodal thermograms observed in protein unfolding.

Main Methods:

  • Thermodynamic calculations based on experimental observations.
  • Modeling of protein denaturation with a single-binding site and ligand interactions.
  • Comparison of computed thermograms with experimental data for human albumin.

Main Results:

  • Bimodal or unimodal thermograms were computed by varying the ligand association constant.
  • Calculated thermograms mimicked experimental data for human albumin with different ligands.
  • Biphasic unfolding arises from coupled ligand binding and protein unfolding equilibria, not substructure.

Conclusions:

  • Ligand-induced biphasic denaturation is a result of altered ligand binding equilibrium during unfolding.
  • This phenomenon is independent of the denaturation method and protein substructure.
  • Consideration of ligand binding effects is essential for studying any macromolecular folding/unfolding reaction.

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