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Using ultraviolet absorption spectroscopy to study nanoswitches based on non-canonical DNA structures.

Blair McCarte¹, Owen T Yeung¹, Alexander J Speakman¹

¹School of Engineering, Institute for Bioengineering, University of Edinburgh, The King's Buildings, Edinburgh, EH9 3DW, Scotland, UK.

Biochemistry and Biophysics Reports

|June 9, 2022

Summary

This summary is machine-generated.

This study used ultraviolet absorption spectroscopy to analyze DNA nanoswitches. Researchers confirmed four G-quartets are needed for folding and identified linker sequences that impact DNA nanostructure formation.

Keywords:

DNA nanoswitches DNA triplexes G-quadruplexes Non-canonical DNA structures Ultraviolet absorption spectroscopy

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DNA Origami-Mediated Substrate Nanopatterning of Inorganic Structures for Sensing Applications

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Published on: September 27, 2019

Area of Science:

Biophysical Chemistry
Nanotechnology
Molecular Biology

Background:

Non-canonical DNA structures, like quadruplexes and triplexes, are crucial for DNA nanotechnology.
Label-free characterization methods are desirable for analyzing DNA nanostructures.
Ultraviolet (UV) absorption spectroscopy offers a label-free approach for studying DNA folding.

Purpose of the Study:

To investigate the utility of UV absorption spectroscopy for probing the folding of DNA quadruplex and triplex nanoswitches.
To determine the minimum requirements for G-quadruplex folding in nanoswitches.
To identify sequence-dependent factors influencing the folding landscape of DNA nanoswitches.

Main Methods:

Utilized UV absorption spectroscopy to monitor the folding of DNA quadruplex and triplex nanoswitches.
Investigated the role of G-quartet formation in quadruplex nanoswitch folding at sub-millimolar potassium concentrations.
Analyzed the impact of linker sequence variations between G-tracts on nanoswitch folding dynamics.

Main Results:

Confirmed that four G-quartets are essential for the folding of quadruplex nanoswitches at sub-mM potassium concentrations.
Demonstrated that specific linker sequences can significantly disrupt nanoswitch folding, potentially due to kinetic traps.
Observed a minor but detectable change in UV absorbance upon triplex formation in the studied triplex nanoswitch.

Conclusions:

UV absorption spectroscopy is a viable label-free technique for characterizing DNA quadruplex and triplex nanoswitches.
The folding of G-quadruplex nanoswitches is sensitive to both G-quartet number and linker sequence.
These findings provide valuable insights for the rational design of DNA-based nanodevices.