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A Selective G-Quadruplex DNA-Stabilizing Ligand Based on a Cyclic Naphthalene Diimide Derivative
Md Monirul Islam1, Satoshi Fujii2, Shinobu Sato3
1Department of Applied Chemistry, Kyushu Institute of Technology, Kitakyushu, Fukuoka 804-8550, Japan. monirbtge@takenaka.che.kyutech.ac.jp.
Molecules (Basel, Switzerland)
|June 16, 2015
Summary
A novel cyclic naphthalene diimide selectively binds to G-quadruplex DNA structures, including human telomeric DNA, with high affinity and inhibits telomerase activity.
Area of Science:
- Medicinal Chemistry
- Molecular Biology
- Biophysical Chemistry
Background:
- G-quadruplex (G4) DNA structures are increasingly recognized as important targets for therapeutic intervention, particularly in cancer.
- Developing selective small molecules that interact with G4 DNA is crucial for targeted therapies.
- Cyclic naphthalene diimides (NDIs) are a class of compounds with potential G4-binding properties.
Purpose of the Study:
- To synthesize a novel cyclic NDI derivative (compound 1) with a benzene linker.
- To investigate the interaction of compound 1 with various G4 DNA structures, including human telomeric DNA (a-core, a-coreTT), c-kit, c-myc, and thrombin-binding aptamer (TBA).
- To evaluate the compound's selectivity and inhibitory activity against telomerase.
Main Methods:
- Synthesis of cyclic NDI derivative (compound 1).
- Spectroscopic techniques: UV-VIS and circular dichroism (CD) spectroscopy.
- Thermal melting temperature (Tm) measurements and Förster resonance energy transfer (FRET)-melting assay.
- Telomerase activity inhibition assay.
Main Results:
- Compound 1 was synthesized and demonstrated to induce different G4 DNA structures.
- High binding affinities (10^6–10^7 M⁻¹) and a 2:1 stoichiometry were observed for G4 DNA binding.
- Compound 1 exhibited significant selectivity (270-fold) for a-core DNA over double-stranded DNA (dsDNA) and preferential binding to human telomeric DNA.
- Potent telomerase inhibition was achieved with an IC50 value of 0.9 μM.
- Compound 1 showed superior binding to G4 DNA compared to a previously reported NDI derivative.
Conclusions:
- The synthesized cyclic NDI derivative (compound 1) effectively binds to various G-quadruplex DNA structures, with a preference for human telomeric DNA.
- Compound 1 demonstrates high selectivity and potent telomerase inhibitory activity, highlighting its potential as a therapeutic agent.
- The study provides valuable insights into the structure-activity relationships of cyclic NDIs as G4 DNA binders.
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