Site-Specific In Situ Metallization of Wireframe DNA Origami for Reversible Fluorescence Switching

Area of Science:

• Nanotechnology
• Biotechnology
• Materials Science

Background:

• DNA origami nanostructures offer precise positioning of functional materials.
• DNA origami-templated gold nanoparticles exhibit tunable optical and electronic properties.

Purpose of the Study:

• To develop a bottom-up nanofabrication strategy for site-specific metallization of DNA origami.
• To demonstrate distance-dependent fluorescence quenching and dynamic control of fluorescence in hybrid nanostructures.

Main Methods:

• Integrating a chemical handle (iodobenzene derivative) into a wireframe DNA origami template.
• Directing gold ion capture and in situ reduction for site-specific metallization.
• Incorporating a fluorescent dye (Cy3) and utilizing strand displacement reactions for dynamic control.

Main Results:

• Achieved site-specific metallization of DNA origami with gold nanoparticles.
• Demonstrated distance-dependent fluorescence quenching via energy transfer.
• Showcased dynamic fluorescence recovery using strand displacement reactions.

Conclusions:

• The developed strategy enables precise fabrication of hybrid DNA-gold nanoparticle nanostructures.
• The system exhibits tunable optical properties and dynamic programmability for nanoscale applications.
• This work provides a versatile platform for constructing advanced functional nanomaterials.