Volume 58, Issue 7 pp. 2109-2113
Communication

Freezing-directed Stretching and Alignment of DNA Oligonucleotides

Dr. Biwu Liu

Dr. Biwu Liu

Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, N2L 3G1 Canada

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Tianyi Wu

Tianyi Wu

Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, N2L 3G1 Canada

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Zhicheng Huang

Zhicheng Huang

Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, N2L 3G1 Canada

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Yibo Liu

Yibo Liu

Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, N2L 3G1 Canada

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Prof. Dr. Juewen Liu

Corresponding Author

Prof. Dr. Juewen Liu

Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario, N2L 3G1 Canada

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First published: 27 December 2018
Citations: 58

Graphical Abstract

Cold as ice: Freezing DNA oligonucleotides stretches and aligns random coils, as confirmed using fluorescence resonance energy transfer, thiazole-orange staining, and surface-enhanced Raman spectroscopy. This will have interesting implications for biointerface science, biosensors, and DNA nanotechnology.

Abstract

Most single-stranded DNA oligonucleotides are random coils with a persistence length of below 1 nm. So far, no good methods are available to stretch oligonucleotides. Herein, it is shown that freezing can stretch DNA, as confirmed using fluorescence resonance energy transfer, thiazole-orange staining, and surface-enhanced Raman spectroscopy. Lateral inter-strand interactions are critical, and the stretched DNA oligonucleotides are aligned. This work also provides a set of methods for studying frozen oligonucleotides. Upon freezing, DNA oligonucleotides are readily adsorbed onto various nanomaterials, including gold nanoparticles, graphene oxide, iron oxide, and WS2 via the most thermodynamically stable conformation, leading to more stable conjugates.

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