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Related Experiment Video

Updated: Jul 28, 2025

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes

Published on: April 4, 2025

Cyclometalated platinum(II) complex as a selective light switch for G-quadruplex DNA.

Meenaxi Saini¹, Tia E Keyes¹

¹School of Chemical Science and National Centre for Sensor Research Dublin City University, Dublin 9, Ireland. tia.keyes@dcu.ie.

Dalton Transactions (Cambridge, England : 2003)

|June 2, 2023

Summary

A platinum complex selectively detects G-quadruplex DNA over duplex DNA. This luminescence sensing is enhanced for specific G-quadruplex structures and shows reversible binding kinetics with c-myc DNA.

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Area of Science:

Inorganic Chemistry
Biophysical Chemistry
Molecular Recognition

Background:

G-quadruplexes are non-canonical DNA secondary structures implicated in various biological processes.
Selective detection of G-quadruplexes is crucial for understanding their function and developing therapeutic strategies.
Platinum complexes are widely explored for their potential in diagnostics and therapeutics.

Purpose of the Study:

To investigate the selective luminescence transduction of G-quadruplex DNA binding by a cyclometalated platinum(II) complex.
To evaluate the influence of G-quadruplex topology on the complex's luminescence response.
To characterize the binding kinetics and reversibility of the complex with a specific G-quadruplex sequence.

Main Methods:

Synthesis and characterization of the cyclometalated platinum(II) complex, 1,3-bis(8-quinolyl) phenyl chloroplatinum(II) (Pt1).
Luminescence spectroscopy to monitor G-quadruplex binding.
Assays using various DNA structures (duplex, parallel G-quadruplex, hybrid G-quadruplex) to assess selectivity.
Kinetic studies and displacement assays to determine binding dynamics with c-myc G-quadruplex.

Main Results:

The platinum complex (Pt1) exhibited selective luminescence transduction upon binding to G-quadruplex DNA, distinguishing it from duplex DNA.
The luminescence response was significantly enhanced for parallel and hybrid G-quadruplex topologies compared to other structures.
Binding kinetics with the c-myc G-quadruplex were investigated, revealing a partially reversible interaction in displacement assays.

Conclusions:

The cyclometalated platinum(II) complex (Pt1) serves as a selective luminescent probe for G-quadruplex DNA.
The probe's response is sensitive to G-quadruplex structural variations, particularly favoring parallel and hybrid forms.
The study provides insights into the binding dynamics of platinum complexes with G-quadruplexes, relevant for biosensing applications.