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From molecular to macroscopic via the rational design of a self-assembled 3D DNA crystal

Abstract

We live in a macroscopic three-dimensional (3D) world, but our best description of the structure of matter is at the atomic and molecular scale. Understanding the relationship between the two scales requires a bridge from the molecular world to the macroscopic world. Connecting these two domains with atomic precision is a central goal of the natural sciences, but it requires high spatial control of the 3D structure of matter1. The simplest practical route to producing precisely designed 3D macroscopic objects is to form a crystalline arrangement by self-assembly, because such a periodic array has only conceptually simple requirements: a motif that has a robust 3D structure, dominant affinity interactions between parts of the motif when it self-associates, and predictable structures for these affinity interactions. Fulfilling these three criteria to produce a 3D periodic system is not easy, but should readily be achieved with well-structured branched DNA motifs tailed by sticky ends2. Complementary sticky ends associate with each other preferentially and assume the well-known B-DNA structure when they do so3; the helically repeating nature of DNA facilitates the construction of a periodic array. It is essential that the directions of propagation associated with the sticky ends do not share the same plane, but extend to form a 3D arrangement of matter. Here we report the crystal structure at 4 Å resolution of a designed, self-assembled, 3D crystal based on the DNA tensegrity triangle4. The data demonstrate clearly that it is possible to design and self-assemble a well-ordered macromolecular 3D crystalline lattice with precise control.

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Figure 1: Schematic design, sequence, and crystal pictures.
Figure 2: Views of the tensegrity triangle.
Figure 3: Lattice formed by tensegrity triangles.

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Acknowledgements

This research has been supported by grants to N.C.S. from the National Institute of General Medical Sciences, the National Science Foundation, the Army Research Office, the Office of Naval Research and the W. M. Keck Foundation. It has also been supported by NSF grant CCF-0622093 and NIH grant 1R21EB007472 to C.M. We thank W. Sherman for assistance in establishing the likely structural features of tensegrity triangles. We thank R. Sweet, M. Allaire, H. Robinson, A. Saxena and A. Héroux at the BNL-NSLS at beamlines X6A and X25 of the National Synchrotron Light Source. BNL-NSLS is supported principally from the Offices of Biological and Environmental Research and of Basic Energy Sciences of the US Department of Energy, and from the National Center for Research Resources of the National Institutes of Health. The use of the 19ID beamline at the Structural Biology Center/Advanced Photon Source is supported by the US Department of Energy, Office of Biological and Environmental Research under contract DE-AC02-06CH11357.

Author Contributions: J.Z. grew crystals, collected data, analysed data and wrote the paper; J.J.B. collected data, analysed data and wrote the paper; Y.C. grew crystals, collected data and analysed data; T.W. grew crystals, collected data, analysed data and wrote the paper; R.S. grew crystals, analysed data and wrote the paper; P.E.C. grew crystals and analysed data; S.L.G. collected data and analysed data; C.M. devised the motif, analysed data and wrote the paper; N.C.S. initiated the project, analysed data and wrote the paper.

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Correspondence to Chengde Mao or Nadrian C. Seeman.

Additional information

Atomic coordinates and experimental structure factors have been deposited within the Protein Data Bank and are accessible under the code 3GBI.

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This file contains Supplementary Methods, Supplementary Table S1 and Supplementary References. (PDF 199 kb)

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Zheng, J., Birktoft, J., Chen, Y. et al. From molecular to macroscopic via the rational design of a self-assembled 3D DNA crystal. Nature 461, 74–77 (2009). https://doi.org/10.1038/nature08274

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