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Updated: Jul 26, 2025

Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
Published on: September 21, 2017
Phenanthroline-modified DNA three-way junction structures stabilized by interstrand 3 : 1 metal complexation
Yusuke Takezawa1, Daisuke Kanemaru1, Naofumi Kudo1
1Department of Chemistry, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. takezawa@chem.s.u-tokyo.ac.jp.
This study shows that modifying DNA three-way junctions (3WJs) with phenanthroline ligands and nickel ions stabilizes the DNA structures. These metal-responsive DNA systems offer new possibilities for molecular construction.
Area of Science:
- Supramolecular chemistry
- Biochemistry
- Materials science
Background:
- DNA supramolecular structures can be stabilized and structurally modified using interstrand metal complexes.
- Phenanthroline (phen) ligands can be incorporated into DNA structures to facilitate metal binding.
Purpose of the Study:
- To synthesize and characterize DNA three-way junction (3WJ) structures modified with phenanthroline ligands.
- To investigate the thermal stabilization and structure induction effects of nickel(II) (NiII) complexes with these modified 3WJs.
Main Methods:
- Synthesis of phenanthroline-modified DNA three-way junction (3WJ) structures.
- Thermal denaturation studies to determine melting temperatures (Tm).
- Spectroscopic analysis to confirm NiII complex formation and structure induction.
Main Results:
- Phen-modified 3WJs exhibited significant thermal stabilization (ΔTm = +16.9 °C) upon formation of an interstrand NiII(phen)3 complex.
- NiII mediated structure induction in 3WJs, both with phen-modified and unmodified strands.
- Demonstrated the formation of stable interstrand metal complexes within DNA structures.
Conclusions:
- Ligand-modified 3WJs are effective structural motifs for creating metal-responsive DNA molecular systems.
- Interstrand metal complexation provides a versatile strategy for controlling DNA structure and stability.
- This approach opens avenues for designing novel DNA-based nanomaterials and molecular devices.
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