4.7 Article

Interaction of 9-Methoxyluminarine with Different G-Quadruplex Topologies: Fluorescence and Circular Dichroism Studies

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MDPI
DOI: 10.3390/ijms221910399

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G-quadruplex; c-MYC; 9-methoxyluminarine; fluorescence; CD spectroscopy

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The highly fluorescent 9-methoxyluminarine ligand 9-MeLM was found to interact with different topologies of G-quadruplexes, selectively quenched by parallel c-MYC G-quadruplex DNA. This suggests that 9-MeLM can potentially be used as a selective probe for parallel G-quadruplexes.
The interactions of G-quadruplexes of different topologies with highly fluorescent 9-methoxyluminarine ligand 9-MeLM were investigated by fluorescence and circular dichroism spectroscopy. The results showed that 9-methoxyluminarine was able to interact and did not destabilize any investigated molecular targets. The studied compound was selectively quenched by parallel c-MYC G-quadruplex DNA, whereas hybrid and antiparallel G4 topology caused only a negligible decrease in the fluorescence of the ligand. A high decrease of fluorescence of the ligand after binding with c-MYC G-quadruplex suggests that this molecule can be used as a selective probe for parallel G-quadruplexes.

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