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Related Experiment Video

Updated: Jul 20, 2026

Analyzing and Building Nucleic Acid Structures with 3DNA

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Published on: April 26, 2013

DNA bending by bHLH charge variants.

Robert J McDonald¹, Jason D Kahn, L James Maher

¹Medical Scientist Training Program, Mayo Clinic College of Medicine, Rochester, MN 55905, USA.

Nucleic Acids Research

|September 16, 2006

Summary

Electrostatic interactions influence DNA bending. Charged proteins can induce DNA bending, but the effect varies with protein structure and charge placement, impacting DNA stiffness.

Area of Science:

Molecular Biology
Biophysics
Structural Biology

Background:

The DNA charge collapse model posits that electrostatic repulsions between phosphate groups contribute significantly to DNA stiffness.
This model predicts that localized charges near DNA can induce bending by asymmetrically altering these repulsive forces.
Previous studies showed that charged variants of the basic-leucine zipper (bZIP) domain of Gcn4p bend DNA consistent with this model.

Purpose of the Study:

To investigate the role of electrostatics in DNA bending using a more globular protein domain.
To extend findings from bZIP proteins to the dimeric basic-helix-loop-helix (bHLH) domain of Pho4p.
To analyze how protein structure influences charge-induced DNA bending.

Main Methods:

Modification of the Pho4p bHLH domain to position charged amino acid residues near one DNA face.

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Experimental investigation of DNA bending induced by these modified bHLH variants.

Comparison of bending responses to charged residues with previously studied bZIP variants.

Main Results:

DNA bending toward appended cations (away from the protein-DNA interface) was observed for bHLH variants, similar to bZIP variants.
Unlike bZIP proteins, bHLH variants did not induce DNA bending away from anionic charges.
This differential bending is attributed to the more extensive DNA contacts made by the globular bHLH domain compared to bZIP proteins.

Conclusions:

Protein structure significantly modulates charge-induced DNA bending.
Extensive DNA contacts, as seen in the bHLH domain, can override or alter bending responses predicted by simple electrostatic models.
Electrostatic interactions remain a key factor in DNA mechanics, but their manifestation is context-dependent on protein-DNA interfaces.