Common G-Quadruplex Binding Agents Found to Interact With i-Motif-Forming DNA: Unexpected Multi-Target-Directed Compounds

Alessia Pagano, Nunzia Iaccarino, Mahmoud A. S. Abdelhamid, Diego Brancaccio, Emanuele U. Garzarella, Anna Di Porzio, Ettore Novellino, Zoë A. E. Waller, Bruno Pagano, Jussara Amato, Antonio Randazzo

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Abstract

G-quadruplex (G4) and i-motif (iM) are four-stranded non-canonical nucleic acid structural arrangements. Recent evidences suggest that these DNA structures exist in living cells and could be involved in several cancer-related processes, thus representing an attractive target for anticancer drug discovery. Efforts toward the development of G4 targeting compounds have led to a number of effective bioactive ligands. Herein, employing several biophysical methodologies, we studied the ability of some well-known G4 ligands to interact with iM-forming DNA. The data showed that the investigated compounds are actually able to interact with both DNA in vitro, thus acting de facto as multi-target-directed agents. Interestingly, while all the compounds stabilize the G4, some of them significantly reduce the stability of the iM. The present study highlights the importance, when studying G4-targeting compounds, of evaluating also their behavior toward the i-motif counterpart.
Original languageEnglish
Article number281
JournalFrontiers in Chemistry
Volume6
DOIs
Publication statusPublished - 24 Jul 2018

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