Blunt-force assembly of programmable DNA architectures using π-π stacking

Area of Science:

• Biotechnology
• Materials Science
• Structural Biology

Background:

• DNA nanotechnology has long relied on sticky-ended cohesion for programmable self-assembly.
• Traditional methods often leave unexploited the diverse contact possibilities inherent in nucleic acids.
• This limits the complexity and variety of achievable nanostructures.

Purpose of the Study:

• To develop a novel DNA self-assembly strategy using blunt-ended motifs.
• To leverage tile geometry and terminal nucleobase identity for predictable 3D architecture formation.
• To explore new avenues for programmability in DNA nanotechnology.

Main Methods:

• Utilized composable DNA tiles with single duplex interfaces and blunt ends.
• Employed X-ray diffraction to analyze the resulting crystal structures.
• Investigated programmable packing, symmetries, and helical twist values.

Main Results:

• Achieved complex 3D DNA architectures with tunable packing and symmetries.
• Demonstrated control over translational and inversion symmetries, and helical twist.
• Successfully co-assembled racemic mixtures of L- and D-DNA motifs using terminal π-π interactions.

Conclusions:

• Blunt-ended DNA motifs offer a new paradigm for programmable self-assembly, expanding beyond sticky-ended approaches.
• This method allows for precise control over crystal formation and complex 3D structure generation.
• The co-assembly of L- and D-DNA demonstrates molecular recognition between mirror systems, opening possibilities for chiral nanotechnology.