Magnesium-dependent enzymes and polyanionic biomolecules

Magnesium-dependent enzymes and polyanionic biomolecules represent a broad class of therapeutic targets where biological activity depends on the coordination of divalent magnesium ions (Mg2+) with negatively charged (polyanionic) substrates such as nucleic acids or adenosine triphosphate (ATP). Magnesium is an essential cofactor for over 300 enzymes, particularly those involved in nucleic acid metabolism, including DNA polymerases, RNA polymerases, and integrases. These enzymes utilize Mg2+ to stabilize the polyanionic backbone of DNA or RNA and to facilitate the chemical reactions required for replication, transcription, and integration. Drugs targeting these systems often employ a chelating motif to sequester the magnesium ions in the active site, effectively blocking the enzyme's ability to interact with its polyanionic substrate. This mechanism is central to the action of several important drug classes, including HIV-1 integrase strand transfer inhibitors (INSTIs), fluoroquinolone antibiotics, and certain aminoglycosides.

Other names

Magnesium-dependent enzymesPolyanionic targetsMetal-dependent enzymesMg2+-dependent enzymes

Drugs typically act by chelating magnesium ions within the active site of the enzyme or by binding to polyanionic substrates (like rRNA or DNA) to displace essential magnesium ions, thereby disrupting the formation of the enzyme-substrate complex and inhibiting catalytic activity.