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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules

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Published on: April 12, 2019

Stability of the pH-Dependent Parallel-Stranded d(CGA) Motif.

Emily M Luteran¹, Jason D Kahn¹, Paul J Paukstelis¹

¹Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland.

Biophysical Journal

|September 23, 2020

Summary

This summary is machine-generated.

The d(CGA) triplet repeat motif

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Area of Science:

DNA nanotechnology
Biophysical chemistry
Materials science

Background:

Noncanonical DNA structures offer versatility beyond Watson-Crick interactions in DNA nanotechnology.
The d(CGA) triplet repeat motif exhibits pH-dependent structural transitions.

Purpose of the Study:

To evaluate the thermodynamic stability and nuclease sensitivity of the d(CGA) triplet repeat motif.
To understand how structural transitions affect stability and nuclease resistance.

Main Methods:

Oligonucleotides with d(CGA) motifs and variants were synthesized.
Thermodynamic stability and nuclease sensitivity were assessed at different pH levels.

Main Results:

Decreasing pH induced a transition from hairpin to parallel-stranded duplex structures.
This transition significantly increased thermodynamic stability and decreased nuclease sensitivity.
Altering the 5'-nucleobase and frequency/position of triplets modulated duplex stability.

Conclusions:

The d(CGA) motif is a pH-adaptive structural element with tunable stability.
This motif provides valuable insights for designing DNA-based nanomaterials.