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Structurally Ordered Nanowire Formation from Co-Assembly of DNA Origami and Collagen-Mimetic Peptides

Jiang, Tao, Meyer, Travis A., Modlin, Charles, Zuo, Xiaobing, Conticello, Vincent P., Ke, Yonggang
Journal of the American Chemical Society 2017 v.139 no.40 pp. 14025-14028
DNA, biomimetic materials, nanosheets, nanowires, peptides, periodicity, physical properties
We describe the co-assembly of two different building units: collagen-mimetic peptides and DNA origami. Two peptides CP⁺⁺ and sCP⁺⁺ are designed with a sequence comprising a central block (Pro-Hyp-Gly) and two positively charged domains (Pro-Arg-Gly) at both N- and C-termini. Co-assembly of peptides and DNA origami two-layer (TL) nanosheets affords the formation of one-dimensional nanowires with repeating periodicity of ∼10 nm. Structural analyses suggest a face-to-face stacking of DNA nanosheets with peptides aligned perpendicularly to the sheet surfaces. We demonstrate the potential of selective peptide-DNA association between face-to-face and edge-to-edge packing by tailoring the size of DNA nanostructures. This study presents an attractive strategy to create hybrid biomolecular assemblies from peptide- and DNA-based building blocks that takes advantage of the intrinsic chemical and physical properties of the respective components to encode structural and, potentially, functional complexity within readily accessible biomimetic materials.