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Analyzing and Building Nucleic Acid Structures with 3DNA

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Published on: April 26, 2013

DNA Structural Changes Induced by Intermolecular Triple Helix Formation.

Ibrahim Sayoh¹, David A Rusling¹, Tom Brown²

¹School of Biological Sciences, Life Sciences Building 85, University of Southampton, Southampton SO17 1BJ, U.K.

|February 4, 2020

Summary

This summary is machine-generated.

The study reveals how DNA flanking sequences influence DNA triplex stability and cleavage. Specific flanking bases, like cytosine, enhance DNA cleavage, impacting DNA structure and flexibility.

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Area of Science:

Molecular Biology
Biochemistry
Structural Biology

Background:

Intermolecular DNA triplexes are structural motifs with potential applications in biotechnology and therapeutics.
DNase I footprinting often reveals enhanced cleavage at the triplex-duplex junction, suggesting sequence-dependent structural alterations.

Purpose of the Study:

To systematically investigate the sequence dependence of enhanced DNase I cleavage at DNA triplex-duplex junctions.
To correlate DNA flanking sequence composition with DNA triplex stability and reactivity.

Main Methods:

DNase I footprinting assays to map cleavage sites and quantify enhancement.
Diethylpyrocarbonate (DEPC) reactivity assays to probe specific base accessibility.
Fluorescence melting experiments to determine the thermal stability (Tm) of DNA triplexes.

Main Results:

Enhanced DNase I cleavage at the 3'-end of the target site was sequence-dependent, with T.AT triplets showing maximal enhancement at ApC.
Reactivity to DEPC was observed at specific adenine residues flanking the triplex-duplex junction (AAA, AAC), but not others (AAG, AAT).
Flanking bases significantly impacted triplex thermal stability, with a 4°C Tm difference observed between flanking C and G; stronger cleavage enhancement correlated with lower thermal stability.

Conclusions:

The flanking sequence composition critically influences DNA triplex stability and DNAse I cleavage patterns.
Oligonucleotide-induced alterations in DNA structure and/or flexibility at the triplex-duplex junction underlie the observed sequence-dependent effects.