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Investigation of 'Head-to-Tail'-Connected Oligoaryl N,O-Ligands as Recognition Motifs for Cancer-Relevant G-Quadruplexes.

ABSTRACT: Oligomeric compounds, constituted of consecutive N,O-heteroaromatic rings, introduce useful and tunable properties as alternative ligands for biomolecular recognition. In this study, we have explored a synthetic scheme relying on Van Leusen oxazole formation, in conjunction with C-H activation of the formed oxazoles and their subsequent C-C cross-coupling to 2-bromopyridines in order to assemble a library of variable-length, 'head-to-tail'-connected, pyridyl-oxazole ligands. Through investigation of the interaction of the three longer ligands (5-mer, 6-mer, 7-mer) with cancer-relevant G-quadruplex structures (human telomeric/22AG and c-Myc oncogene promoter/Myc2345-Pu22), the asymmetric pyridyl-oxazole motif has been demonstrated to be a prominent recognition element for G-quadruplexes. Fluorescence titrations reveal excellent binding affinities of the 7-mer and 6-mer for a Na?-induced antiparallel 22AG G-quadruplex (KD = 0.6 × 10-7 M-1 and 0.8 × 10-7 M-1, respectively), and satisfactory (albeit lower) affinities for the 22AG/K? and Myc2345-Pu22/K? G-quadruplexes. All ligands tested exhibit substantial selectivity for G-quadruplex versus duplex (ds26) DNA, as evidenced by competitive Förster resonance energy transfer (FRET) melting assays. Additionally, the 7-mer and 6-mer are capable of promoting a sharp morphology transition of 22AG/K? G-quadruplex.


PROVIDER: S-EPMC6149995 | BioStudies | 2017-01-01T00:00:00Z


REPOSITORIES: biostudies

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