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A simple model for determining affinity from irreversible thermal shifts.

Justin Hall1

  • 1Worldwide Medicinal Chemistry, Pfizer, Groton, Connecticut.

Protein Science : a Publication of the Protein Society
|July 31, 2019
PubMed
Summary

Researchers explored the relationship between ligand binding (KD) and thermal denaturation (ΔTm) for irreversible protein unfolding. They developed equations to interpret ΔTm, suggesting a general correlation for irreversible denaturation processes.

Keywords:
activation energyirreversible denaturationligand affinity and unfoldingprotein unfoldingthermal denaturation

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Area of Science:

  • Biochemistry
  • Protein Science
  • Chemical Biology

Background:

  • Thermal denaturation (Tm) is a widely used technique for protein analysis in academic and industrial settings.
  • A correlation between ligand affinity (KD) and ΔTm is established for reversible protein denaturation.
  • Quantitative interpretation of ΔTm for irreversible protein denaturation remains a challenge.

Purpose of the Study:

  • To investigate the relationship between ligand affinity (KD) and thermal denaturation (ΔTm) for irreversible protein unfolding.
  • To develop and validate equations for quantitatively interpreting ΔTm in irreversible denaturation.
  • To establish the applicability of KD to ΔTm correlations for irreversible processes.

Main Methods:

  • Development of theoretical equations linking KD and ΔTm for irreversible protein unfolding.
  • Validation of the derived equations using computational modeling.
  • Experimental testing of the equations with relevant biological data.

Main Results:

  • Defined equations that relate KD to ΔTm for irreversible protein unfolding.
  • Computational models supported the theoretical framework.
  • Experimental data demonstrated the validity of the proposed relationships.

Conclusions:

  • A general relationship between KD and ΔTm exists for irreversible protein denaturation.
  • The developed equations provide a quantitative method to interpret ΔTm data for irreversible unfolding.
  • This work bridges a gap in understanding protein-ligand interactions during irreversible denaturation.