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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
Published on: April 4, 2025
Platinum squares with high selectivity and affinity for human telomeric G-quadruplexes
Xiao-Hui Zheng1, Huo-Yan Chen, Ming-Liang Tong
1MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China.
Chemical Communications (Cambridge, England)
|June 26, 2012
Summary
New platinum(II) squares selectively bind human telomeric G-quadruplex DNA structures. These compounds show high binding affinity, unprecedented stoichiometry, telomerase inhibition, and anticancer efficacy.
Area of Science:
- Medicinal Chemistry
- Supramolecular Chemistry
- Biochemistry
Background:
- G-quadruplexes are four-stranded DNA structures found in telomeres.
- Telomeric G-quadruplexes are implicated in cancer progression.
- Targeting G-quadruplexes offers a potential anticancer strategy.
Purpose of the Study:
- To synthesize and characterize novel platinum(II) squares with quinoxaline-bridges.
- To investigate the selective binding of these complexes to human telomeric G-quadruplexes.
- To evaluate their potential as anticancer agents via telomerase inhibition.
Main Methods:
- Synthesis of platinum(II) square complexes.
- Spectroscopic and binding studies (e.g., UV-Vis, fluorescence) to determine binding constants and stoichiometry.
- Telomerase activity assays.
- In vitro anticancer efficacy assessments.
Main Results:
- Two new platinum(II) squares with quinoxaline-bridges were synthesized.
- High selectivity and binding constants (10(7)-10(9) M(-1)) for human telomeric G-quadruplexes were observed.
- An unprecedented binding stoichiometric ratio of 6:1 (Pt(II) square/G-quadruplex) was achieved.
- Significant telomerase inhibition and anticancer efficacy were demonstrated.
Conclusions:
- The cube-like shape of the Pt(II) squares likely contributes to their selective G-quadruplex stabilization.
- These novel platinum(II) complexes represent promising candidates for anticancer drug development targeting telomeres.
