Dynamic DNA architectures: spontaneous DNA strand exchange and self-sorting driven by perylene bisimide interactions

Area of Science:

• Supramolecular Chemistry
• DNA Nanotechnology
• Organic Electronics

Background:

• Perylene bisimides (PBIs) are versatile chromophores with tunable electronic properties.
• DNA nanotechnology offers a scaffold for constructing complex molecular architectures.
• Self-assembly and self-sorting are crucial for creating ordered nanostructures.

Purpose of the Study:

• To synthesize PBI homodimers and incorporate them into DNA double strands.
• To investigate the spontaneous DNA strand exchange and self-sorting behavior of PBI-DNA conjugates.
• To explore the influence of PBI electronic density on the formation of DNA architectures.

Main Methods:

• Synthetic incorporation of bay-substituted PBI chromophores into DNA strands.
• Preparation of preannealed DNA duplexes containing different PBI homodimers.
• Mixing of PBI-DNA duplexes to induce spontaneous DNA strand exchange and observe self-sorting.
• Spectroscopic and structural analysis to characterize the resulting DNA architectures.

Main Results:

• Successful synthesis and DNA incorporation of three PBI homodimers and one unsubstituted PBI.
• Observation of spontaneous DNA strand exchange upon mixing of PBI-DNA duplexes.
• Demonstration of dynamic self-sorting that preferentially forms PBI heterodimers.
• Evidence that the electronic density of PBI chromophores controls the self-sorting process and resulting DNA architectures.

Conclusions:

• Perylene bisimide-DNA conjugates can undergo spontaneous strand exchange leading to dynamic self-sorting.
• The self-sorting process allows for the preferential formation of PBI heterodimers within DNA architectures.
• The electronic properties of the PBI chromophores provide a mechanism for controlling the assembly of these DNA-based nanostructures.