Enhancing G-Quadruplex Binding: Rational Design and Biophysical Evaluation of Dimeric Ligands

Area of Science:

• Biochemistry
• Medicinal Chemistry
• Genomics

Background:

• Guanine-quadruplexes (G4s) are non-canonical DNA structures found in the human genome, including gene promoters.
• G4s play a role in gene regulation and can be targeted by small-molecule ligands.
• Anthraquinone derivatives are effective scaffolds for G4-targeting agents.

Purpose of the Study:

• To rationally design and synthesize novel dimeric anthraquinone-based ligands.
• To create ligands capable of acting as molecular tweezers for G4 recognition.
• To evaluate the binding affinity, selectivity, and antiproliferative effects of these new compounds.

Main Methods:

• Synthesis of dimeric anthraquinone ligands with polyethylene glycol (PEG) linkers.
• Biophysical characterization using fluorescence thermal shift assays, ESI-mass spectrometry, and CD spectroscopy.
• Molecular modeling studies and cytotoxicity assays.

Main Results:

• Successfully synthesized and characterized novel dimeric anthraquinone compounds.
• Demonstrated the potential of these compounds to interact with G4 structures.
• Preliminary evaluation of antiproliferative activity.

Conclusions:

• The designed dimeric anthraquinone ligands show promise as G4-targeting agents.
• The molecular tweezer approach offers enhanced G4 recognition.
• Further investigation is warranted to explore their therapeutic potential in gene regulation and cancer therapy.