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In Vitro Chemical Mapping of G-Quadruplex DNA Structures by Bis-3-Chloropiperidines
Published on: May 12, 2023
Bis-phenanthroline derivatives as suitable scaffolds for effective G-quadruplex recognition
S Bianco1, C Musetti, A Waldeck
1Dept. of Pharmaceutical Sciences, v. Marzolo 5, 35131, Padova, Italy.
Dalton Transactions (Cambridge, England : 2003)
|May 26, 2010
Summary
Bis-phenanthroline ligands complexed with metal ions selectively recognize and stabilize G-quadruplex DNA structures. These complexes inhibit telomerase activity and show potential as antiproliferative drug leads with low toxicity.
Area of Science:
- Medicinal Chemistry
- Molecular Biology
- Biochemistry
Background:
- Selective DNA structure recognition is crucial for biological and pharmacological applications.
- G-quadruplex (G-4) structures are physiologically relevant DNA secondary structures with therapeutic potential.
Purpose of the Study:
- To investigate the recognition of G-quadruplex structures by bis-phenanthroline (bis-Phen) ligands.
- To evaluate the effect of metal ion complexation on G-4 stabilization and biological activity.
Main Methods:
- Synthesis and characterization of bis-Phen metal complexes (Mn2+, Ni2+, Cu2+, Mg2+, Zn2+).
- G-quadruplex stabilization assays (melting temperature determination).
- G-4 induction studies (gel shift, circular dichroism).
- Telomerase inhibition assays.
- Cellular toxicity assessments.
Main Results:
- Bis-Phen ligands efficiently form 1:1 complexes with various transition and biologically relevant metal ions.
- Metal complexation significantly enhances G-4 stabilization, increasing melting temperatures by up to 30°C.
- Complexes induce G-4 formation in unfolded G-rich sequences, even without K+ ions.
- Bis-Phen complexes, particularly Ni(II) complexes, are potent telomerase inhibitors (sub-micromolar range).
- Compounds exhibit low DNA-damaging activity and short-term cellular toxicity.
Conclusions:
- Metal-complexed bis-Phen ligands are effective G-quadruplex binders and stabilizers.
- These novel compounds demonstrate significant telomerase inhibitory activity.
- Ni(II) bis-Phen complexes represent promising drug leads for antiproliferative therapies due to their efficacy and safety profile.
