Rational Design of Phenanthrene - Based DNA Intercalators: Mechanistic & Therapeutic Insights

The rational design of DNA-targeted small molecules continues to represent a cornerstone of modern medicinal chemistry, particularly in the development of anticancer therapeutics. Among planar polycyclic aromatic systems, the has emerged as a structurally advantageous framework for engineering efficient DNA intercalators due to its intrinsic rigidity, extended π-conjugation, and synthetic versatility. This review delineates the structural and energetic principles governing phenanthrene–DNA interactions, with emphasis on π–π stacking stabilization, helical distortion, and thermodynamic signatures of intercalative binding. Strategic molecular modifications—including cationic side-chain incorporation, electronic modulation, and metal coordination—are critically evaluated in the context of enhancing binding affinity, selectivity, and biological efficacy. Mechanistic insights linking DNA intercalation to topoisomerase inhibition, replication interference, and apoptosis induction are discussed to establish structure–mechanism–activity correlations. Furthermore, contemporary biophysical and computational approaches are highlighted as essential tools for quantitative assessment and predictive optimization of phenanthrene-based intercalators. Collectively, this analysis provides a unified framework for the rational development of phenanthrene-derived DNA intercalators with improved therapeutic potential.