Journal: Nat Commun / Year: 2025 Title: Modular programming of interaction and geometric specificity enables assembly of complex DNA origami nanostructures. Authors: Rupam Saha / Daichi Hayakawa / Thomas E Videbæk / Mason Price / Wei-Shao Wei / Juanita Pombo / Daniel Duke / Gaurav Arya / Gregory M Grason / W Benjamin Rogers / Seth Fraden / Abstract: Self-assembly of nanoscale building blocks with programmable geometries and interactions offers a powerful route to engineer materials that mimic the complexity of biological structures. DNA origami ...Self-assembly of nanoscale building blocks with programmable geometries and interactions offers a powerful route to engineer materials that mimic the complexity of biological structures. DNA origami provides an exceptional platform for this purpose, enabling precise control over subunit shape, binding angles, and interaction specificity. Here we present a modular DNA origami design approach to address the challenges of assembling geometrically complex nanoscale structures, including those with nonuniform curvatures. This approach features a core structure that completely conserves the scaffold routing across different designs and preserves more than 70% of the DNA staples between designs, dramatically reducing both cost and effort, while enabling precise and independent programming of subunit interactions and binding angles through adjustable overhang lengths and sequences. Using cryogenic electron microscopy, gel electrophoresis, and coarse-grained simulations, we validate a set of robust design rules and demonstrate the assembly of diverse self-limiting structures, including anisotropic shells, a T = 13 icosahedral shell, and a toroid with globally varying curvature. This modular strategy provides an efficient and cost-effective framework for the synthetic fabrication of complex nanostructures.
Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 293 K / Instrument: FEI VITROBOT MARK IV
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Electron microscopy
Microscope
FEI TECNAI F20
Image recording
Film or detector model: OTHER / Digitization - Dimensions - Width: 4096 pixel / Digitization - Dimensions - Height: 4096 pixel / Number real images: 395 / Average exposure time: 3.5 sec. / Average electron dose: 25.0 e/Å2 / Details: Camera used is the Gatan OneView Camera (4k x 4k).
Electron beam
Acceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron optics
Illumination mode: OTHER / Imaging mode: BRIGHT FIELD / Cs: 0.8 mm / Nominal defocus max: 4.0 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 29000
Sample stage
Specimen holder model: GATAN 626 SINGLE TILT LIQUID NITROGEN CRYO TRANSFER HOLDER Cooling holder cryogen: NITROGEN
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