Sturdier DNA nanotubes via ligation.

Area of Science:

• Biotechnology
• Materials Science
• Nanotechnology

Background:

• DNA nanotubes, self-assemblies of DNA tiles, offer programmability and stiffness for various applications.
• However, inherent nicks in their phosphate backbone limit their thermal and mechanical stability.
• These discontinuities cause DNA nanotubes to degrade below 40°C, break during atomic force microscopy (AFM) scanning, and disintegrate in deionized water.

Purpose of the Study:

• To address the stability limitations of DNA nanotubes.
• To investigate the impact of ligating nicks on the structural integrity and application potential of DNA nanotubes.

Main Methods:

• Identified five nicks per DNA tile in the nanotubes: one in the core and four at the corners.
• Employed T4 DNA ligase to ligate the four corner nicks.
• Assessed the physical and chemical properties of ligated DNA nanotubes, including thermal stability, mechanical resistance during AFM, and stability in deionized water.

Main Results:

• Successful ligation of all four corner nicks in the DNA nanotubes was achieved.
• Ligated nanotubes exhibited significantly enhanced thermal stability, withstanding temperatures over 70°C.
• Ligated DNA nanotubes demonstrated improved resistance to breakage during AFM scanning and remained stable in deionized water for over a month.

Conclusions:

• Ligating corner nicks in DNA nanotubes effectively enhances their physical and chemical robustness.
• The improved stability does not compromise the nanotubes' inherent stiffness.
• Ligated DNA nanotubes are suitable for a wider range of technological applications requiring greater durability.