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Protein-protein Interfaces

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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...

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Noncovalent Attractions in Biomolecules

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Immunoprecipitation

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Chromatin Immunoprecipitation
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Ligand Binding Sites

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Related Experiment Video

Updated: Jun 6, 2026

Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry

Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry

Published on: January 17, 2025

Interpreting protein/DNA interactions: distinguishing specific from non-specific and electrostatic from

Peter L Privalov¹, Anatoly I Dragan, Colyn Crane-Robinson

¹Department of Biology, Johns Hopkins University, Baltimore, MD 21218, USA.

Nucleic Acids Research

|November 13, 2010

Summary

The counter-ion condensation (CC) concept explains protein-DNA complex formation by focusing on salt effects and counter-ion release. This empirical approach offers practical value, unlike theoretical Poisson-Boltzmann (PB) analysis.

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Genetic and Biochemical Approaches for In Vivo and In Vitro Assessment of Protein Oligomerization: The Ryanodine Receptor Case Study

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Published on: July 27, 2016

Area of Science:

Biochemistry
Molecular Biology
Physical Chemistry

Background:

Protein-DNA complexes are crucial for cellular functions.
Understanding the forces driving their formation is essential.
Existing theoretical and empirical methods offer different perspectives.

Purpose of the Study:

To evaluate the effectiveness of current methods for analyzing protein-DNA complex formation.
To contrast theoretical Poisson-Boltzmann (PB) analysis with the empirical counter-ion condensation (CC) concept.
To determine the practical utility of each approach.

Main Methods:

Theoretical analysis using the Poisson-Boltzmann (PB) equation.
Empirical analysis of salt effects on complex stability.
Application of the counter-ion condensation (CC) concept.

Main Results:

The CC concept highlights the dominant role of counter-ion release in complex formation.
The electrostatic component of binding energy is primarily entropic and salt-dependent.
Salt-independent binding energy shows sequence specificity, contrary to initial assumptions.
PB analysis has yet to demonstrate practical merit in this context.

Conclusions:

The counter-ion condensation (CC) approach provides a practical framework for studying protein-DNA interactions.
The CC model effectively explains the entropic contribution of salt effects.
Sequence-specific interactions are primarily governed by non-electrostatic, salt-independent forces.