Polyamine-binding sites on DNA, RNA, and related cellular polyanions

Polyamine-binding sites on DNA, RNA, and other cellular polyanions are critical regulatory interfaces where small aliphatic cations like spermine and spermidine interact with negatively charged genetic material (Pegg, 2016, J. Biol. Chem.). These interactions are essential for stabilizing the DNA double helix, facilitating complex RNA folding patterns, and modulating the activity of enzymes involved in replication and translation (Wallace et al., 2003, Biochem. J.). In many disease states, particularly cancer, polyamine metabolism is dysregulated, leading to an overabundance of these molecules which supports rapid cell proliferation and survival (Casero & Marton, 2007, Nat. Rev. Drug Discov.). Consequently, these binding sites are targeted by polyamine analogs and mimetics designed to displace natural polyamines, thereby inducing structural changes in DNA—such as the B-to-Z transition—and triggering apoptotic pathways (Bachrach, 2010, Plant Physiol. Biochem.). Beyond oncology, these sites are relevant in viral infections, where polyamines assist in the packaging of viral genomes, and in neurodegeneration, where they modulate ion channel activity and protein aggregation. Therapeutic strategies focusing on these sites often involve a combination of synthesis inhibitors and competitive analogs to deplete intracellular polyamine pools and disrupt their essential interactions with cellular polyanions.

Other names

Nucleic acid-polyamine binding sitesPolyanionic interaction sitesDNA-polyamine complexesRNA-polyamine complexesPolyamine-nucleic acid interface

Competitive displacement of endogenous polyamines from polyanionic sites on DNA and RNA, leading to conformational changes (such as the B-to-Z DNA transition), inhibition of macromolecular synthesis, and induction of apoptosis.