Mechatronic DNA devices driven by a G-quadruplex-binding platinum ligand.

Area of Science:

• Biochemistry
• Nanotechnology
• Molecular Biology

Background:

• Contractile DNA duplexes are cation-driven mechatronic devices.
• These duplexes switch between extended (E) and contracted (C) conformations.
• Potassium ions induce the E→C transition via G-quadruplex formation.

Purpose of the Study:

• To investigate ligand-induced E→C transitions in contractile DNA duplexes.
• To explore the impact of platinum-based ligands on DNA conformation.
• To understand the formation of distinct contracted states in DNA mechatronic devices.

Main Methods:

• Utilized platinum-based ligands (Pt-PIP and Pt-bpy) to induce conformational changes in DNA contractile helices.
• Examined the effect of G-quadruplex binding affinity on the E→C transition.
• Analyzed the resulting DNA topologies in the contracted states.

Main Results:

• Pt-PIP, a G-quadruplex ligand, efficiently promoted the E→C transition in contractile DNA duplexes.
• Pt-bpy, a poor binder, did not induce the E→C transition.
• Distinct contracted (C) states with different DNA topologies were observed, both exhibiting electrical conductivity.

Conclusions:

• Ligand binding can drive conformational changes in DNA mechatronic devices.
• Pt-PIP acts as an efficient switch for contractile DNA duplexes.
• These ligand-driven DNA devices show potential as biosensors for G-quadruplex binding ligands.