Fluorimetric Detection of G-Quadruplex DNA in Solution and Adsorbed on Surfaces with a Selective Trinuclear Cyanine Dye

Langmuir : the ACS Journal of Surfaces and Colloids
H IhmelsImad Zamrik

Abstract

Quadruplex DNA, which is a relevant target for anticancer therapies, may alter its conformation because of interactions with interfaces. In pursuit of a versatile methodology to probe adsorption-induced conformational changes, the interaction between a fluorescent [2.2.2]heptamethinecyanine dye and quadruplex DNA (G4-DNA) was studied in solution and on surfaces. In solution, the cyanine dye exhibits a strong light-up effect upon the association with G4-DNA without interference from double-stranded DNA. In addition, a terminal π-stacking as a binding mode between the cyanine dye and G4-DNA is concluded using NMR spectroscopy. To unravel the effects of adsorption on the conformation of quadruplex-DNA, G4-DNA, and double-stranded and single-stranded DNA were adsorbed to positively charged poly(allylamine) hydrochloride (PAH) surfaces, both in planar and in constrained 55 nm diameter aluminum oxide nanopore formats. All DNA forms showed a very strong affinity to the PAH surfaces as shown by surface plasmon resonance and reflectometric interference spectroscopy. The significant increase of the fluorescence emission intensity of the cyanine light-up probe observed exclusively for surface immobilized G4-DNA affords evidence for the ad...Continue Reading

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Citations

Sep 22, 2020·ACS Omega·Kübra DoğanÖzgül Persil Çetinkol
Feb 15, 2019·Organic Letters·Anastasiia A TikhomirovaR Marshall Wilson
Feb 6, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Imad ZamrikHolger Schönherr
Sep 14, 2019·Bioconjugate Chemistry·Eric A OwensMaged Henary

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