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Beyond DNA interactions: Insights into idarubicin's binding dynamics with tRNA using spectroscopic and computational
Sonika Charak1, Chandra Mohan Srivastava2, Dhruv Kumar3
1CSIR-National Physical Laboratory, New Delhi 110012, India; National Brain Research Centre, Manesar, Gurugram, Haryana 122051, India.
Journal of Photochemistry and Photobiology. B, Biology
|March 18, 2025
Summary
Idarubicin binds strongly to RNA, interacting with guanine, uracil, and adenine. This binding is spontaneous and stable, preserving RNA structure, offering insights for new cancer therapies.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- Idarubicin is a potent anticancer drug, a structural analogue of daunomycin.
- Understanding its interaction with RNA is crucial for optimizing cancer therapeutics.
Purpose of the Study:
- To investigate the binding interactions between idarubicin and RNA.
- To elucidate the binding mechanism, affinity, and thermodynamic properties.
Main Methods:
- Infrared (IR) spectroscopy
- Absorption spectroscopy
- Circular dichroism (CD)
- Molecular docking
- Molecular dynamics (MD) simulations
Main Results:
- Idarubicin binds to guanine, uracil, and adenine in RNA.
- A strong binding constant (K = 2.1 × 10³ M⁻¹) and spontaneous binding (ΔG ≈ -4.57 kcal/mol) were observed.
- Binding is stabilized by hydrogen bonding, π-π stacking, and electrostatic forces, with minimal perturbation to RNA structure.
Conclusions:
- Idarubicin exhibits a strong and stable interaction with RNA through a flexible binding mechanism.
- The findings provide a basis for developing novel RNA-targeting cancer drugs with improved efficacy and reduced side effects.
