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Tuning the Cavity Size and Chirality of Self-Assembling 3D DNA Crystals.
- Source :
-
Journal of the American Chemical Society . 8/16/2017, Vol. 139 Issue 32, p11254-11260. 7p. - Publication Year :
- 2017
-
Abstract
- The foundational goal of structural DNA nanotechnology -- the field that uses oligonucleotides as a molecular building block for the programmable self-assembly of nanostructured systems -- was to use DNA to construct three-dimensional (3D) lattices for solving macromolecular structures. The programmable nature of DNA makes it an ideal system for rationally constructing self-assembled crystals and immobilizing guest molecules in a repeating 3D array through their specific stereospatial interactions with the scaffold. In this work, we have extended a previously described motif (4 X 5) by expanding the structure to a system that links four double-helical layers; we use a central weaving oligonucleotide containing a sequence of four six-base repeats (4 X 6), forming a matrix of layers that are organized and dictated by a series of Holliday junctions. In addition, we have assembled mirror image crystals (L-DNA) with the identical sequence that are completely resistant to nucleases. Bromine and selenium derivatives were obtained for the L- and D-DNA forms, respectively, allowing phase determination for both forms and solution of the resulting structures to 3.0 and 3.05 À resolution. Both right- and left-handed forms crystallized in the trigonal space groups with mirror image 3-fold helical screw axes P32 and P31 for each motif,respectively. The structures reveal a highly organized array of discrete and well-defined cavities that are suitable for hosting guest molecules and allow us to dictate a priori the assembly of guest -- DNA conjugates with a specified crystalline hand. [ABSTRACT FROM AUTHOR]
- Subjects :
- *DNA crystallography
*THREE-dimensional imaging
*CHIRALITY of nuclear particles
Subjects
Details
- Language :
- English
- ISSN :
- 00027863
- Volume :
- 139
- Issue :
- 32
- Database :
- Academic Search Index
- Journal :
- Journal of the American Chemical Society
- Publication Type :
- Academic Journal
- Accession number :
- 125128408
- Full Text :
- https://doi.org/10.1021/jacs.7b06485