Porphyrin-based design of bioinspired multitarget quadruplex ligands

Area of Science:

• Medicinal Chemistry
• Biochemistry
• Molecular Biology

Background:

• Secondary nucleic acid structures like DNA and RNA quadruplexes are promising anticancer targets.
• Ligands interacting with these structures hold potential as therapeutic agents.
• Synthetic G-quartets serve as bioinspired G-quadruplex ligands.

Purpose of the Study:

• To design, synthesize, and evaluate a novel multitarget G-quadruplex ligand, (PNA)PorphySQ.
• To incorporate peptidic nucleic acid guanine ((PNA)G) into a porphyrin-templated synthetic G-quartet (PorphySQ).
• To assess the ligand's binding properties and drug-like characteristics.

Main Methods:

• Synthesis of the (PNA)PorphySQ ligand.
• Fluorescence resonance energy transfer (FRET)-melting experiments to evaluate quadruplex interaction.
• Assessment of chemical stability and water solubility.

Main Results:

• The (PNA)PorphySQ ligand demonstrated enhanced quadruplex-interacting properties.
• Positively charged (PNA)G residues improved electrostatic interactions with DNA and RNA quadruplexes.
• Improved chemical stability and water solubility compared to the non-PNA derivative.

Conclusions:

• (PNA)PorphySQ is a promising prototype multitarget G-quadruplex ligand.
• The ligand's design facilitates improved electrostatic interactions with target quadruplexes.
• Further development of (PNA)PorphySQ could lead to novel anticancer agents.