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Interference of ATP with the fluorescent probes YOYO-1 and YOYO-3 modifies the mechanical properties of intercalator-stained DNA confined in nanochannels

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Abstract

Intercalating fluorescent probes are widely used to visualize DNA in studies on DNA-protein interactions. Some require the presence of adenosine triphosphate (ATP). We have investigated the mechanical properties of DNA stained with the fluorescent intercalating dyes YOYO-1 and YOYO-3 as a function of ATP concentrations (up to 2 mM) by stretching single molecules in nanofluidic channels with a channel cross-section as small as roughly 100 × 100 nm2. The presence of ATP reduces the length of the DNA by up to 11 %. On the other hand, negligible effects are found if DNA is visualized with the minor groove-binding probe 4′,6-diamidino-2-phenylindole. The apparent drop in extension under nanoconfinement is attributed to an interaction of the dye and ATP, and the resulting expulsion of YOYO-1 from the double helix.

Nanochannel-stretched DNA (48.5 kbp) stained with YOYO-1 is sensitive to ATP concentration in buffer. Nanochannels with a cross-section of 80 × 80 nm2 were used to stretch DNA.

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Acknowledgments

We acknowledge support from the National Institutes of Health (R01GM107559), and thank Keith Weninger for fruitful discussions.

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Correspondence to Robert Riehn.

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Roushan, M., Azad, Z., Lim, S.F. et al. Interference of ATP with the fluorescent probes YOYO-1 and YOYO-3 modifies the mechanical properties of intercalator-stained DNA confined in nanochannels. Microchim Acta 182, 1561–1565 (2015). https://doi.org/10.1007/s00604-015-1495-7

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  • DOI: https://doi.org/10.1007/s00604-015-1495-7

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