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Naphthyridine tetramer with a pre-organized structure for 1:1 binding to a CGG/CGG sequence
Chikara Dohno1, Izumi Kohyama, Changfeng Hong
1Department of Regulatory Bioorganic Chemistry, The Institute of Scientific and Industrial Research (SANKEN), Osaka University, 8-1 Mihogaoka, Ibaraki 567-0047, Japan.
Nucleic Acids Research
|December 1, 2011
Summary
Researchers developed novel naphthyridine tetramers for precise DNA binding. These ligands, particularly Z-NCTS, achieve exclusive 1:1 binding to CGG/CGG sequences, offering improved molecular design insights for DNA/RNA ligands.
Area of Science:
- Chemical Biology
- Molecular Biology
- Supramolecular Chemistry
Background:
- Naphthyridine carbamate dimers (NCDs) are synthetic ligands that bind DNA CGG/CGG sequences.
- The 2:1 binding stoichiometry of NCDs complicates precise binding analysis.
Purpose of the Study:
- To synthesize naphthyridine tetramers for exclusive 1:1 binding to CGG/CGG DNA sequences.
- To identify ligands with improved binding affinity and stoichiometry control.
Main Methods:
- Synthesis of naphthyridine tetramers with varying linker moieties.
- Analysis of ligand-DNA complex stoichiometry using biophysical techniques.
- Thermodynamic characterization via isothermal titration calorimetry.
Main Results:
- Naphthyridine tetramers NCTB and Z-NCTS demonstrated exclusive 1:1 binding to CGG/CGG sequences.
- The (Z)-stilbene linker in Z-NCTS enhanced binding affinity due to a pre-organized conformation.
- Z-NCTS exhibited a lower entropic cost, contributing to its stronger binding.
Conclusions:
- Novel 1:1 binding ligands for CGG/CGG DNA sequences were developed.
- Ligand design with conformationally restricted linkers is crucial for controlling binding stoichiometry.
- Findings provide valuable feedback for designing future DNA and RNA binding ligands.
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