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Related Experiment Video

Updated: May 11, 2026

Studying DNA Looping by Single-Molecule FRET

Studying DNA Looping by Single-Molecule FRET

Published on: June 28, 2014

Quantifying Coulombic and solvent polarization-mediated forces between DNA helices.

Zhaojian He¹, Shi-Jie Chen

¹Department of Physics and Department of Biochemistry, University of Missouri, Columbia, Missouri 65211, USA.

The Journal of Physical Chemistry. B

|May 25, 2013

Summary

This study quantifies forces stabilizing DNA tertiary folds in ionic solutions. Ion correlation and solvent polarization are key factors influencing attraction and repulsion between DNA helices.

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Area of Science:

Nucleic acids biophysics
Computational biophysics
Biomolecular interactions

Background:

Predicting forces stabilizing nucleic acid tertiary folds is a fundamental challenge.
Understanding interhelix interactions is crucial for nucleic acid folding.
Ionic solutions significantly influence biomolecular structures.

Purpose of the Study:

To quantitatively estimate and analyze forces between DNA helices in ionic solutions.
To investigate the roles of ion correlation and solvent polarization in interhelix interactions.
To develop a theoretical framework for predicting forces in nucleic acid folding.

Main Methods:

Generalized Born model for electrostatic calculations.
Improved atomistic tightly binding ions model for ion interactions.
Quantitative analysis of hydration, Coulomb correlation, and ion entropy effects.

Main Results:

Hydration, Coulomb correlation, and ion entropy collectively drive repulsion and attraction between DNA helices.
Specific ion effects observed in Mg(2+) (repulsion) and Mn(2+) (attraction) solutions.
Theoretical predictions align with experimental observations.
Solvent polarization and ion correlation are identified as critical contributors to interhelix forces.

Conclusions:

The developed theory provides a quantitative framework for understanding DNA helix interactions.
The findings offer insights into the forces governing nucleic acid tertiary structure formation.
This approach can be extended for systematic predictions in nucleic acid folding studies.