Journal
ACS NANO
Volume 13, Issue 2, Pages 996-1002Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b04631
Keywords
DN nanotechnology; DNA origami; lipid membrane; diffusion; single particle tracking; super-resolution microscopy
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Funding
- European Commission through the ERC, ORCA [336440]
- DFG [SFB1032]
- Graduate School of Quantitative Biosciences Munich
- International Max Planck Research School for Molecular and Cellular Life Sciences (IMPRS-LS)
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DNA nanostructures offer the possibility to mimic functional biological membrane components due to their nanometer-precise shape configurability and versatile biochemical functionality. Here we show that the diffusional behavior of DNA nanostructures and their assembly into higher order membrane-bound lattices can be controlled in a stop-and-go manner and that the process can be monitored with super-resolution imaging. The DNA structures are transiently immobilized on glass-supported lipid bilayers by changing the mono- and divalent cation concentrations of the surrounding buffer. Using DNA points accumulation for imaging in nanoscale topography (DNA-PAINT) super-resolution microscopy, we confirm the fixation of DNA origami structures with different shapes. On mica-supported lipid bilayers, in contrast, we observe residual movement. By increasing the concentration of NaCl and depleting MgCl2, a large fraction of DNA structures restarts to diffuse freely on both substrates. After addition of a set of oligonucleotides that enables three Y-shaped monomers to assemble into a three-legged shape (triskelion), the triskelions can be stopped and super-resolved. Exchanging buffer and adding another set of oligonucleotides triggers the triskelions to diffuse and assemble into hexagonal 2D lattices. This stop-and-go imaging technique provides a way to control and observe the diffusional behavior of DNA nanostructures on lipid membranes that could also lead to control of membrane associated cargos.
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