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Related Experiment Video

Updated: May 17, 2026

The Development and Application of Biophysical Assays for Evaluating Ternary Complex Formation Induced by Proteolysis Targeting Chimeras (PROTACS)
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Published on: January 12, 2024

Binding efficiency of protein-protein complexes.

Eric S Day1, Shaun M Cote, Adrian Whitty

  • 1Biogen Idec, 14 Cambridge Center, Cambridge, Massachusetts 02142, United States.

Biochemistry
|October 24, 2012
PubMed
Summary
This summary is machine-generated.

Protein-protein interactions (PPIs) require a minimum interface size for stability. The study quantifies binding efficiency, revealing that smaller receptors in the tumor necrosis factor (TNF) superfamily achieve higher binding efficiencies than larger ones.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Interactions

Background:

  • Protein-protein interactions (PPIs) are crucial for cellular functions.
  • The tumor necrosis factor (TNF) superfamily and their receptors (TNFRs) mediate diverse biological processes.
  • Understanding the biophysical principles governing PPI affinity and interface size is essential.

Purpose of the Study:

  • To investigate the relationship between binding affinity and interface size in PPIs.
  • To determine binding efficiencies for TNF-TNFR complexes.
  • To establish a quantitative framework for predicting interface requirements for desired binding affinities.

Main Methods:

  • Surface plasmon resonance (SPR) was used to measure binding affinities of specific TNF-TNFR interactions.
  • Analysis of existing cocrystal structures to determine interface areas.
  • Calculation of binding energy per unit interface area (binding efficiency).
  • Comparison with a dataset of 144 diverse PPI complexes.

Main Results:

  • A minimal contact area of approximately 500 Ų is necessary for stable PPIs.
  • The most efficient PPIs achieve around 20 cal mol⁻¹ Å⁻² of binding energy.
  • TNF-TNFR complexes exhibit varying efficiencies; BAFF-BR3 is highly efficient (~80% of maximum).
  • Larger receptors (e.g., TNFR1) show lower binding efficiencies (44-49%) compared to smaller receptors.

Conclusions:

  • Binding efficiency is strongly correlated with interface size and receptor type.
  • Smaller receptors within the TNF superfamily can achieve higher binding efficiencies.
  • The study provides a quantitative method to predict interface size needed for specific binding affinities in PPIs.