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Macrocyclic DNA-mismatch-binding ligands: structural determinants of selectivity.

Anton Granzhan1, Eric Largy, Nicolas Saettel

  • 1UMR176 CNRS, Institut Curie, Centre de Recherche, Centre Universitaire, 91405 Orsay, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 26, 2009
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Researchers developed novel macrocyclic bisintercalators that selectively bind to DNA with thymine mismatches (TX), not to normal DNA (TA). This discovery highlights ligand topology

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Area of Science:

  • Medicinal Chemistry
  • Molecular Biology
  • Organic Chemistry

Background:

  • Macrocyclic bisintercalators are compounds that can interact with DNA.
  • DNA mismatches, such as thymine-thymine mismatches (TX), are important in genetic stability and disease.
  • Developing selective DNA-binding agents is crucial for therapeutic applications.

Purpose of the Study:

  • To synthesize novel homodimeric and heterodimeric macrocyclic bisintercalators.
  • To investigate the DNA binding affinity and selectivity of these compounds for mismatched DNA.
  • To explore the role of ligand topology in DNA-mismatch recognition.

Main Methods:

  • Synthesis of macrocyclic bisintercalators via condensation reactions.
  • DNA binding studies using thermal denaturation (Tm) assays.
  • Fluorescent-intercalator-displacement assays to assess binding selectivity.

Main Results:

  • Successfully synthesized 15 homodimeric and 5 novel heterodimeric macrocyclic bisintercalators.
  • Bisnaphthalene derivatives, particularly 2,7-disubstituted ones, exhibited high selectivity for TX mismatches over fully paired DNA (TA).
  • Ligand topology was identified as a critical factor influencing binding affinity and selectivity for DNA mismatches.

Conclusions:

  • Novel macrocyclic bisintercalators demonstrate significant selectivity for DNA thymine mismatches.
  • The structural design (topology) of these macrocycles is key to achieving specific recognition of DNA lesions.
  • These findings pave the way for developing targeted DNA-interacting agents for potential therapeutic use.