DNA nanomechanical switches under folding kinetics control.

Area of Science:

• Nanotechnology
• Molecular Biology
• Biophysics

Background:

• Traditional DNA nanodevices function at equilibrium, requiring environmental changes for operation.
• This limits their stability and integration into complex systems.

Purpose of the Study:

• To design and characterize a DNA switch capable of operating out of equilibrium under fixed chemical conditions.
• To demonstrate a method for locking the DNA switch in a stable, non-equilibrium conformation.

Main Methods:

• Utilized heat denaturation followed by controlled cooling rates to manipulate DNA switch conformation.
• Employed Förster Resonance Energy Transfer (FRET) to probe and confirm the molecular state.
• Investigated the retention of the non-equilibrium state at room temperature over extended periods.

Main Results:

• A rapid cooling rate (>100 °C/ms) after heat denaturation successfully locked the DNA switch in a unique, metastable conformation.
• This non-equilibrium state was retained for weeks at room temperature, demonstrating remarkable stability.
• The reversible nature of the process was confirmed through FRET measurements.

Conclusions:

• The developed DNA switch operates effectively out of equilibrium, offering a new paradigm for DNA-based nanodevices.
• This approach enhances stability and simplifies operational requirements, making it more suitable for nanotechnology and scalable integration.
• Out-of-equilibrium DNA switches represent a significant advancement for future molecular machines and devices.