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Selective Luminescent Labeling of DNA and RNA Quadruplexes by π‐Extended Ruthenium Light‐Up Probes

A series of RuII complexes exhibiting π‐extended, acridine‐based ancillary chelating heterocycles display high affinity and selectivity for DNA and RNA quadruplexes. The most promising candidates (3, 4) possess remarkable light‐up luminophore properties (up to 330‐fold luminescence enhancement upon...

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Published in:Chemistry : a European journal 2017-04, Vol.23 (21), p.4967-4972
Main Authors: Saadallah, Dounia, Bellakhal, Mehdi, Amor, Souheila, Lefebvre, Jean‐François, Chavarot‐Kerlidou, Murielle, Baussanne, Isabelle, Moucheron, Cécile, Demeunynck, Martine, Monchaud, David
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Language:English
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Summary:A series of RuII complexes exhibiting π‐extended, acridine‐based ancillary chelating heterocycles display high affinity and selectivity for DNA and RNA quadruplexes. The most promising candidates (3, 4) possess remarkable light‐up luminophore properties (up to 330‐fold luminescence enhancement upon interaction with quadruplexes), enabling them to discriminate quadruplexes from genomic DNA owing to a photochemical mechanism involving DNA protection against non‐radiative decay (DAND), thus deviating from the other complexes of this series of ligands that exhibit an excited‐state intramolecular proton transfer (ESIPT) that quenches their luminescence. The in vitro and preliminary in cellulo results shown here confirm the interest of this new family of fluorophores as invaluable molecular tools to detect G‐quadruplexes in cells. Shine a light: A series of RuII complexes exhibiting π‐extended, acridine‐based ancillary chelating heterocycles display high affinity and selectivity for quadruplexes and remarkable light‐up luminophore properties that enable them to discriminate quadruplexes from genomic DNA.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201605948