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The Importance of Correct Protein Concentration for Kinetics and Affinity Determination in Structure-function Analysis
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Interplay between binding affinity and kinetics in protein-protein interactions.

Huaiqing Cao1,2, Yongqi Huang3, Zhirong Liu1,2

  • 1College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.

Proteins
|March 29, 2016
PubMed
Summary

Molecular simulations reveal that protein-protein interactions have deep binding valleys and barriers. Dissociation rates correlate with experimental values, showing similar kinetics for intrinsically disordered and ordered proteins.

Keywords:
binding affinitycoarse-grained modelintrinsically disordered proteinslinear free-energy relationshipprotein−protein interaction

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Area of Science:

  • Biophysics
  • Computational Biology
  • Structural Biology

Background:

  • Protein-protein interactions (PPIs) are crucial for cellular functions.
  • Understanding the relationship between binding affinity and kinetics is key.
  • The role of intrinsically disordered proteins (IDPs) in PPIs requires further investigation.

Purpose of the Study:

  • To investigate the interplay between binding affinity and kinetics in PPIs.
  • To explore the contribution of IDPs to these interactions.
  • To elucidate the free energy landscapes of protein complex formation.

Main Methods:

  • Molecular simulations were performed on 20 protein complexes.
  • Bias potential and reweighting techniques were employed to obtain free energy profiles.
  • The Arrhenius law was used to extract dissociation rates.

Main Results:

  • Free energy profiles showed deep bound-state valleys with barrier heights of 12–33 RT.
  • Entropic contribution to binding affinity was found to be proportional to interface area.
  • Dissociation rates correlated well with experimental values (R=0.79).
  • A linear free energy relationship between binding affinity and dissociation rate was confirmed for all complexes.
  • IDPs did not show significant differences in kinetic behavior compared to ordered proteins.

Conclusions:

  • The study provides insights into the thermodynamics and kinetics of PPIs.
  • The findings suggest that interface area is a key determinant of entropic contribution to binding.
  • The kinetic behavior of IDPs in PPIs is comparable to that of ordered proteins.