A high-endurance DNA origami snap-through switch for functional nanoscale control

Area of Science:

• Nanotechnology
• Biomolecular Engineering
• Materials Science

Background:

• Switchable elements are crucial for both technological and biological systems, enabling reversible transitions between functional states.
• DNA origami offers a versatile platform for constructing nanoscale devices with precise control over structure and function.

Purpose of the Study:

• To present a DNA origami-based, mechanically bistable snap-through mechanism.
• To demonstrate electrical control over this nanoscale switching mechanism.
• To explore its potential applications in molecular information processing, nanophotonics, and biochemical regulation.

Main Methods:

• Fabrication of a DNA origami structure exhibiting a mechanically bistable snap-through mechanism.
• Application of electric fields to actuate the nanoscale switch.
• Characterization of switching speed, stability, and endurance through repeated cycling.
• Functionalization with gold nanorods for optical modulation.
• Integration with molecular binding sites to control reaction kinetics.

Main Results:

• The developed nanoswitch exhibits millisecond-scale switching times upon electrical stimulation.
• The device maintains long-term stability in both states without external stimuli.
• Individual switches withstand hundreds of thousands of cycles over hours and remain functional for days.
• Functionalization with gold nanorods enables polarization-dependent optical modulation.
• Electrical control over a molecular binding site demonstrates coupling of mechanical switching to biochemical function.

Conclusions:

• The DNA origami-based nanoswitch provides a stable, electrically controllable platform for nanoscale actuation.
• The device demonstrates potential for applications in plasmonics and dynamically controlling biochemical reactions.
• This system serves as a valuable tool for studying the endurance and failure mechanisms of biomolecular nanoswitches.