Fig. 1: Schematics of DNA TC tiles and reconfigurable DNA nanorings.
From: DNA T-shaped crossover tiles for 2D tessellation and nanoring reconfiguration
a The design of one-, two-, and three-layer TC tiles. These TC tiles adopt AX crossover and T-junction features. Crossovers are placed between two helices to reinforce the arms of TC tiles (green). T junction introduces a third direction of monomer tile to create a perpendicular shape (orange). The dash lines in side view indicate the layers of tiles. b Two types of the reconfigurable 4-state DNA nanostructures. Both C- and Z-shape tiles contain toeholds on horizontal arms. The toehold-mediated strand displacement reaction (SDR) enables the shortening or lengthening of the horizontal arms. Assembled structures from Z or C tiles can reconfigure to adopt four different geometric states. For example, the C-tile is employed for 4-state ring-to-ring reconfigurations, and the Z-tile is for 4-state ladder-to-ring transformations.
