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Related Experiment Video

Updated: May 26, 2026

Atomic Force Microscopy Investigations of DNA Lesion Recognition in Nucleotide Excision Repair

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Published on: May 24, 2017

DNA sequence context conceals α-anomeric lesions.

Christopher N Johnson¹, Alexander M Spring, Sunil Desai

¹Department of Chemistry, Georgia State University, Atlanta, GA 30303, USA.

Journal of Molecular Biology

|January 10, 2012

Summary

This summary is machine-generated.

DNA sequence context influences DNA damage repair. A 5'CαAG-3' motif creates a straighter DNA helix, obscuring lesions and modulating endonuclease IV recognition, unlike the 5'CαAC-3' sequence.

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Area of Science:

Molecular Biology
Structural Biology
Biochemistry

Background:

DNA sequence context is known to affect DNA damage detection and repair.
Previous work showed 5'CαAC-3' creates a kinked DNA duplex with an enlarged minor groove.

Purpose of the Study:

To elucidate the structural basis for altered DNA damage recognition by the 5'CαAG-3' motif.
To understand how DNA structure influences endonuclease IV activity.

Main Methods:

Determined the solution structure of a DNA duplex containing a 5'CαAG-3' core using Nuclear Magnetic Resonance (NMR).
Employed extensive restraints including dipolar couplings and backbone torsion angles.
Compared the structure to a previously studied 5'CαAC-3' DNA duplex.

Main Results:

The 5'CαAG-3' DNA duplex structure showed the α-anomeric adenosine (αA) base in a reverse Watson-Crick orientation, forming a weak base pair with thymine.
This structure exhibited reduced local perturbations, resulting in a straighter DNA helix with a narrower minor groove compared to 5'CαAC-3'.
The altered DNA conformation and improved stacking of the 5'CαAG-3' core affect the energetics of complex formation with repair enzymes.

Conclusions:

The straighter DNA helix and narrower minor groove associated with the 5'CαAG-3' motif obscure DNA lesions, impacting repair enzyme recognition.
These structural features provide a mechanistic explanation for the modulation of endonuclease IV activity by specific DNA sequence contexts.