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Oxadiazole/Pyridine-Based Ligands: A Structural Tuning for Enhancing G-Quadruplex Binding.

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New pyridyl-oxadiazole compounds selectively bind to DNA G-quadruplexes, particularly the telomeric sequence. These ligands show potential as anticancer agents by targeting structures like those found in cancer cells.

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Area of Science:

  • Medicinal Chemistry
  • Chemical Biology
  • Nucleic Acid Chemistry

Background:

  • Non-macrocyclic heteroaryls are effective ligands for nucleic acid recognition.
  • Pyridyl polyoxazoles and polyoxadiazoles show selectivity for G-quadruplex structures, exhibiting anticancer activity.

Purpose of the Study:

  • Synthesize and evaluate a novel family of heteroaryls containing oxadiazole and pyridine moieties for targeting DNA G-quadruplexes.
  • Conduct structure-activity analysis to identify key determinants of activity and selectivity.
  • Investigate binding affinities and modes towards various G-quadruplex structures.

Main Methods:

  • Convergent synthesis to modulate heterocyclic composition (oxazole vs. oxadiazole, pyridine vs. benzene).
  • Evaluation of ligands against G-quadruplex DNA structures (human telomeric, c-myc, c-kit promoters).
  • Competitive binding assays (vs. duplex DNA) and G4-FID assays to determine binding preference and mode.
  • Circular Dichroism (CD) titrations to assess structural transitions in DNA.

Main Results:

  • Heptapyridyl-oxadiazole compounds demonstrated preferential binding to the telomeric sequence (22AG) over duplex DNA.
  • G4-FID assays indicated a binding mode distinct from classical G-quartet stacking.
  • CD titrations revealed structural transitions of the 22AG sequence in the presence of potent compounds TOxAzaPy and TOxAzaPhen in a potassium-rich buffer.

Conclusions:

  • The pyridyl-oxadiazole motif is a promising recognition element for G-quadruplexes.
  • Compounds with seven heteroaryls in a single unit show significant potential for G-quadruplex targeting.
  • This class of compounds warrants further investigation for anticancer drug development.