Inosine incorporation in DNA nanostructures and 3D DNA crystals

Area of Science:

• Biochemistry
• Nanotechnology
• Synthetic Biology

Background:

• DNA nanotechnology utilizes programmable base pairing for precise nanoscale structure assembly.
• Sequence variability in DNA nanostructures is typically achieved using modified bases or analogs.
• The natural base inosine, common in RNA editing, has not been explored in DNA nanotechnology.

Purpose of the Study:

• To investigate the utility of inosine in DNA nanostructures.
• To explore inosine's impact on DNA nanostructure assembly and stability.
• To demonstrate the application of inosine in creating complex 3D DNA architectures.

Main Methods:

• Incorporation of inosine into duplex regions and junctions of double crossover DNA motifs.
• Strand displacement and competition assays to evaluate inosine-containing strand stability.
• Design and assembly of 3D DNA crystals using inosine base pairs in sticky ends.

Main Results:

• Inosine-containing DNA strands are resistant to displacement by canonical complements after nanostructure assembly.
• Inosine-modified strands compete effectively during assembly but enhance stability post-assembly.
• Sticky ends with inosine enable the rational design and formation of 3D DNA crystals based on the tensegrity triangle motif.

Conclusions:

• Inosine is a valuable tool for introducing sequence variation in DNA nanotechnology.
• Inosine enhances the stability and programmability of DNA nanostructures.
• This work expands the toolkit for designing complex DNA-based nanomaterials.