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Self-assembly of two-dimensional DNA origami lattices using cation-controlled surface diffusion

2014; Nature Portfolio; Volume: 5; Issue: 1 Linguagem: Inglês

10.1038/ncomms5889

2041-1723

Sungwook Woo, Paul W. K. Rothemund,

Plasmonic and Surface Plasmon Research

DNA origami has proven useful for organizing diverse nanoscale components into patterns with 6 nm resolution. However for many applications, such as nanoelectronics, large-scale organization of origami into periodic lattices is desired. Here, we report the self-assembly of DNA origami rectangles into two-dimensional lattices based on stepwise control of surface diffusion, implemented by changing the concentrations of cations on the surface. Previous studies of DNA–mica binding identified the fractional surface density of divalent cations as the parameter which best explains the behaviour of linear DNA on mica. We show that for between 0.04 and 0.1, over 90% of DNA rectangles were incorporated into lattices and that, compared with other functions of cation concentration, best captures the behaviour of DNA rectangles. This work shows how a physical understanding of DNA–mica binding can be used to guide studies of the higher-order assembly of DNA nanostructures, towards creating large-scale arrays of nanodevices for technology. DNA origami is useful for organizing nanoscale objects, and linear arrays of DNA origami have previously been assembled via programmable bonds based on DNA base-stacking. Here, such ‘stacking bonds’ are used to assemble large 2D lattices of DNA origami by a novel cation-controlled surface diffusion mechanism.