Studies on the interaction mechanism of aminopyrene derivatives with human tumor-related DNA

Area of Science:

• Environmental Chemistry
• Molecular Biology
• Toxicology

Background:

• Polycyclic aromatic hydrocarbons (PAHs) derivatives are known carcinogens.
• Amino-PAHs pose risks for human malignant diseases.
• Understanding their DNA interaction is crucial for risk assessment.

Purpose of the Study:

• To evaluate the interactions between specific amino-PAHs and human tumor-related DNA.
• To elucidate the binding mechanisms and affinities of these compounds.
• To investigate the structural consequences of amino-PAH binding to DNA.

Main Methods:

• Spectroscopic techniques were employed to analyze PAH-DNA interactions.
• Polyacrylamide gel electrophoresis (PAGE) was used to assess DNA conformational changes.
• Binding constants were determined for the amino-PAH-DNA complexes.

Main Results:

• Significant interactions were observed between amino-PAHs and targeted DNA.
• 1-Aminopyrene (1-AP) exhibited stronger binding (10^6 L/mol) than 1-pyrenebutanoic acid (1-PBA) (10^3 L/mol).
• 1-AP primarily intercalated via electrostatic forces; 1-PBA intercalated with Van der Waals forces and hydrogen bonds.
• Amino-PAH binding was stronger to p53 DNA than C-myc DNA.
• Amino-PAH binding induced DNA conformational changes from duplex to antiparallel G-quadruplex.

Conclusions:

• Amino-PAHs interact with human tumor DNA through distinct mechanisms.
• Binding affinity and mode depend on the PAH's chemical structure.
• These interactions can alter DNA conformation, potentially impacting gene function and disease pathways.