A library screening approach identifies naturally occurring RNA sequences for a G-quadruplex binding ligand

Area of Science:

• Biochemistry
• Molecular Biology
• Medicinal Chemistry

Background:

• G-quadruplexes are nucleic acid structures with therapeutic potential.
• Identifying specific G-quadruplexes that interact with small molecules is crucial for drug development.
• Kanamycin A is an aminoglycoside antibiotic with known interactions with nucleic acids.

Purpose of the Study:

• To develop and validate a screening strategy for identifying RNA G-quadruplexes that bind to kanamycin A.
• To characterize the binding interactions between kanamycin A and identified G-quadruplex sequences.
• To establish a method for discovering potential intracellular G-quadruplex targets for ligands.

Main Methods:

• Synthesis of a diverse RNA G-quadruplex library.
• Screening the library against kanamycin A using a suitable assay.
• Characterization of G-quadruplex sequences exhibiting differential binding to kanamycin A.

Main Results:

• Successful identification of naturally occurring G-quadruplex forming sequences with specific binding affinity for kanamycin A.
• Characterization of these identified sequences, detailing their binding properties.
• Demonstration of a robust method for ligand-target G-quadruplex discovery.

Conclusions:

• The developed screening strategy is effective for identifying specific RNA G-quadruplexes that bind to kanamycin A.
• This method offers a simple and efficient way to discover potential intracellular G-quadruplex targets for various ligands.
• The findings pave the way for targeted drug design and development against RNA G-quadruplex structures.