Kanamycin and G-Quadruplexes: An Exploration of Binding Interactions

Area of Science:

• Biochemistry
• Molecular Biology
• Pharmacology

Background:

• G-quadruplexes (G4s) are four-stranded DNA structures crucial in cellular processes.
• Their unique structure makes them promising therapeutic targets, especially for cancer treatment.
• Drug repurposing efforts aim to identify existing drugs that can modulate G4 stability and function.

Purpose of the Study:

• To investigate the potential of drug candidates to interact with G-quadruplex DNA structures.
• To identify specific drug molecules that can bind to and modulate G4 stability and function.
• To explore the therapeutic implications of G4-drug interactions for diseases like cancer.

Main Methods:

• Computational docking studies were employed to predict drug-G4 interactions.
• Molecular dynamics (MDs) simulations were utilized to analyze the stability and dynamics of G4-drug complexes.
• Analysis focused on interactions with various parallel and hybrid G4 topologies in human DNA structures.

Main Results:

• Kanamycin demonstrated significant binding affinity to multiple G-quadruplex structures.
• Favorable interactions were observed between kanamycin and both parallel and hybrid G4 topologies.
• These findings suggest a potential mechanism for kanamycin's therapeutic effects and associated toxicities.

Conclusions:

• Kanamycin shows promise as a modulator of G-quadruplex dynamics.
• Its interaction with G4s could lead to novel therapeutic strategies for G4-related diseases.
• The study suggests aminoglycosides might exert effects by binding to non-ribosomal RNA structures, potentially explaining toxicity.