A DNA Walker as a Fluorescence Signal Amplifier.

Nano Lett

Institute for Physical & Theoretical Chemistry, and Braunschweig Integrated Centre of Systems Biology (BRICS), and Laboratory for Emerging Nanometrology (LENA), Braunschweig University of Technology, 38106 Braunschweig, Germany.

Published: September 2017

Sensing nucleic acids typically involves the recognition of a specific sequence and reporting by, for example, a fluorogenic reaction yielding one activated dye molecule per detected nucleic acid. Here, we show that after binding to a DNA origami track a bound DNA target (a "DNA walker") can release the fluorescence of many molecules by acting as the catalyst of an enzymatic nicking reaction. As the walking kinetics sensitively depends on the walker sequence, the resulting brightness distribution of DNA origamis is a sequence fingerprint with single-nucleotide sensitivity. Using Monte Carlo simulations, we rationalize that the random self-avoiding walk is mainly terminated when steps to nearest neighbors are exhausted. Finally, we demonstrate that the DNA walker is also active in a plasmonic hotspot for fluorescence enhancement, indicating the potential of combining different amplification mechanisms enabled by the modularity of DNA nanotechnology.

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http://dx.doi.org/10.1021/acs.nanolett.7b01829DOI Listing

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