DNA Block Macromolecules Based on Rolling Circle Amplification Act as Scaffolds to Build Large-Scale Origami Nanostructures.

A simplified origami strategy to create large-scale complex DNA nanostructures based on the rolling circle amplification (RCA) is developed. The long repetitive block single strand DNA (ssDNA) synthesized from RCA with a few staple strands are used to fabricate DNA origami, which can be assembled into the first level assemblies of micro-scale length mono-nanoladders. Depending on base pairing among the sticky ends of short staple strands in nanoladders, the second level assemblies with large-scale and controlled structures such as tri-nanoladder, penta-nanoladder, and even nanobrocade, can be further achieved.