Triangulating Nucleic Acid Conformations Using Multicolor Surface Energy Transfer

ACS Nano
Ryan A RiskowskiGeoffrey F Strouse

Abstract

Optical ruler methods employing multiple fluorescent labels offer great potential for correlating distances among several sites, but are generally limited to interlabel distances under 10 nm and suffer from complications due to spectral overlap. Here we demonstrate a multicolor surface energy transfer (McSET) technique able to triangulate multiple points on a biopolymer, allowing for analysis of global structure in complex biomolecules. McSET couples the competitive energy transfer pathways of Förster Resonance Energy Transfer (FRET) with gold-nanoparticle mediated Surface Energy Transfer (SET) in order to correlate systematically labeled points on the structure at distances greater than 10 nm and with reduced spectral overlap. To demonstrate the McSET method, the structures of a linear B-DNA and a more complex folded RNA ribozyme were analyzed within the McSET mathematical framework. The improved multicolor optical ruler method takes advantage of the broad spectral range and distances achievable when using a gold nanoparticle as the lowest energy acceptor. The ability to report distance information simultaneously across multiple length scales, short-range (10-50 Å), mid-range (50-150 Å), and long-range (150-350 Å), distinguish...Continue Reading

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Citations

Oct 21, 2017·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Sebastián A DíazEunkeu Oh
Jun 7, 2018·ACS Nano·Kate J F CarnevaleGeoffrey F Strouse

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