Planar 2D wireframe DNA origami

Area of Science:

• Nanotechnology
• Biophysics
• Materials Science

Background:

• Two-dimensional (2D) DNA origami is crucial for diverse applications.
• Conventional single-layer 2D DNA origami can be flexible, limiting its use as a structural template.
• Six-helix bundle wireframe DNA origami offers enhanced rigidity and local control over duplex orientation.

Purpose of the Study:

• To investigate the three-dimensional (3D) structure and solution behavior of six-helix bundle wireframe 2D DNA origami.
• To assess the planarity, homogeneity, and resolution achievable with this advanced DNA origami technique.

Main Methods:

• Cryo-electron microscopy (cryo-EM) for 3D structural reconstruction.
• Coarse-grained molecular simulations to complement experimental data.

Main Results:

• Cryo-EM 3D reconstructions demonstrated high planarity and homogeneity for polygonal wireframe DNA origami in solution.
• Achieved 10-Å resolution for a triangular structure, showcasing high fidelity.
• Coarse-grained simulations validated the cryo-EM findings and provided molecular insights.

Conclusions:

• Six-helix bundle wireframe 2D DNA origami exhibits excellent structural fidelity and in-plane rigidity in solution.
• These DNA assemblies are suitable for 2D material applications requiring precise structural control.
• This approach surpasses parallel duplex assembly for applications demanding high structural integrity.