Stabilization and structural changes of 2D DNA origami by enzymatic ligation

Area of Science:

• Nanotechnology
• Biochemistry
• Structural Biology

Background:

• DNA nanostructures suffer from low thermal stability, limiting their practical use.
• Nicks in DNA staple backbones cause premature melting of nanostructures below 60°C.
• Enzymatic ligation is standard in molecular biology but not optimized for DNA nanotechnology.

Purpose of the Study:

• To analyze and optimize enzymatic ligation conditions for DNA origami staple strands.
• To investigate the impact of ligation on DNA origami thermal stability and structure.
• To determine optimal ligation parameters for improved DNA nanostructure performance.

Main Methods:

• Optimization of T4 DNA ligase concentration, temperature, and incubation time.
• Ligation of staple strands in four types of 2D square lattice DNA origami.
• Thermal stability assays and structural analysis (e.g., planarity, compactness) of native and ligated origami.
• Investigation of ethidium bromide intercalation effects on ligated and native origami structures.

Main Results:

• Optimized overnight ligation at 37°C with higher T4 DNA ligase concentrations achieved up to 55% efficiency for 10 staples.
• Ligation increased DNA origami thermal stability by 5-20°C.
• Ligated DNA origami exhibited enhanced compactness and planarity.
• Ethidium bromide intercalation dynamically altered the structure of both native and ligated origami.

Conclusions:

• Optimized enzymatic ligation is a viable strategy to improve DNA origami thermal stability and structural integrity.
• Ligation enhances the performance of DNA nanostructures for advanced applications.
• Further research can explore dynamic structural changes and optimize ligation for diverse DNA nanostructures.