Logic gating by macrocycle displacement using a double-stranded DNA [3]rotaxane shuttle.

Area of Science:

• Supramolecular Chemistry
• Nanotechnology
• Molecular Engineering

Background:

• Molecular interlocked systems with mechanically trapped components are key building blocks for dynamic nanostructures.
• DNA nanotechnology offers precise control over molecular assembly and function.

Purpose of the Study:

• To synthesize unprecedented double-stranded (ds) DNA [2]- and [3]rotaxanes with multiple stations.
• To demonstrate controlled macrocycle movement and logic-gated responses in DNA nanostructures.
• To develop DNA-based shuttles for potential cargo delivery applications.

Main Methods:

• Synthesis of dsDNA rotaxanes with distinct macrocycle binding stations.
• Utilizing oligodeoxynucleotides (ODNs) as inputs to trigger structural changes and macrocycle migration.
• Employing atomic force microscopy (AFM) for precise localization of macrocycle positions in nonsymmetrical rotaxanes.
• Investigating light irradiation and fuel ODNs as external stimuli for macrocycle control.

Main Results:

• Successful synthesis of novel dsDNA [2]- and [3]rotaxanes.
• Demonstrated controlled release and migration of macrocycles within the [3]rotaxane system.
• Achieved logic-gated responses based on different ODN inputs, producing diverse output signals.
• Verified unambiguous macrocycle localization using AFM in nonsymmetrical [2]rotaxanes.
• Showcased light or fuel ODN-driven macrocycle movement to specific stations.

Conclusions:

• The developed DNA nanostructures represent promising prototypes for sophisticated molecular shuttles.
• These rotaxanes enable logic-gated control over molecular movement, paving the way for advanced nanodevices.
• The systems are suitable for applications in controlled cargo delivery and release mechanisms.