Multiple magnesium-dependent enzymes

Magnesium-dependent enzymes represent a vast and diverse class of proteins that require magnesium ions (Mg2+) as a mandatory cofactor for their catalytic activity or structural stability. Magnesium typically coordinates with water molecules and amino acid residues within the enzyme active site to orient substrates, stabilize transition states, or facilitate nucleophilic attacks, particularly in reactions involving phosphate transfer (NIH, 2022). This group includes essential enzymes such as DNA and RNA polymerases, kinases, phosphatases, and ATPases, making them fundamental to nearly all biological processes including replication, transcription, and energy metabolism (Jahnen-Dechent & Ketteler, 2012). In a pharmacological context, several high-profile drug classes exert their effects by interacting with the magnesium-binding sites of specific enzymes. For instance, HIV integrase strand transfer inhibitors (INSTIs) like dolutegravir bind to the two magnesium ions in the integrase active site to prevent viral DNA integration (Grobler et al., 2002). Similarly, quinolone antibiotics interact with magnesium ions to inhibit bacterial DNA gyrase and topoisomerase IV (Aldred et al., 2014). Because magnesium is involved in over 300 enzymatic reactions in the human body, drugs targeting these sites must be highly specific to avoid widespread systemic toxicity.

Other names

Mg2+-dependent enzymesMagnesium-requiring enzymesMagnesium-dependent phosphohydrolases

Inhibition via chelation of active-site magnesium ions or competitive binding at the magnesium-dependent catalytic center.