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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Published on: April 4, 2025

Confined space facilitates G-quadruplex formation.

Prakash Shrestha¹, Sagun Jonchhe¹, Tomoko Emura²

¹Department of Chemistry and Biochemistry, Kent State University, Kent, Ohio 44242, USA.

Nature Nanotechnology

|March 28, 2017

Summary

This summary is machine-generated.

Confined spaces enhance macromolecule stability. DNA origami nanocages reveal that smaller spaces increase human telomeric DNA G-quadruplex stability and folding rates, offering insights into cellular processes.

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Area of Science:

Biophysics
Molecular Biology
Nanotechnology

Background:

Molecular simulations predict increased macromolecule stability in confined environments due to entropic effects.
Experimental validation is limited by container-molecule interactions.
Human telomeric DNA G-quadruplexes are crucial structures with implications in cellular processes.

Purpose of the Study:

To experimentally isolate and quantify the effect of confined space on G-quadruplex stability.
To investigate the influence of varying confinement dimensions on G-quadruplex mechanical and thermodynamic properties.
To compare G-quadruplex behavior in confined spaces versus dilute or crowded solutions.

Main Methods:

Utilized DNA origami nanocages to create controlled confined environments.
Applied targeted mechanical unfolding to individual G-quadruplexes within the nanocages.
Measured changes in mechanical and thermodynamic stability as a function of nanocage size.
Compared folding rates in nanocages to those in bulk solutions.

Main Results:

G-quadruplex mechanical and thermodynamic stability increased significantly with decreasing nanocage size.
G-quadruplexes within nanocages exhibited substantially greater stability compared to those in dilute or crowded buffers.
Folding rates of G-quadruplexes were accelerated by up to 100 times in confined nanocages.
The DNA origami nanocage remained unperturbed during G-quadruplex unfolding experiments.

Conclusions:

Confined environments, independent of wall interactions, demonstrably enhance G-quadruplex stability and folding kinetics.
The findings support the hypothesis that entropic effects dominate in promoting macromolecule stability within confined spaces.
Suggests potential for G-quadruplex folding within cellular machinery, such as during replication or transcription.