Divalent metal ions

Divalent metal ions, such as magnesium (Mg2+), calcium (Ca2+), and zinc (Zn2+), are essential for the structural integrity and survival of bacterial pathogens. In Gram-negative bacteria, these cations stabilize the outer membrane by cross-linking negatively charged lipopolysaccharide (LPS) molecules, maintaining a robust permeability barrier (Nikaido, 2003, PMID: 12633691). Within biofilms, divalent ions cross-link extracellular polymeric substances (EPS), providing the mechanical strength and resistance characteristic of mature microbial communities (Körstgens et al., 2001, DOI: 10.1016/S0043-1354(00)00516-4). In the host environment, these ions are critical cofactors for bacterial enzymes and are the focus of nutritional immunity, where the host sequesters metals to inhibit pathogen growth (Hood & Skaar, 2012, PMID: 22742577). Therapeutic strategies targeting these ions involve chelating agents like EDTA or citrate, which sequester the cations to destabilize bacterial structures and enhance the penetration of co-administered antibiotics (Banin et al., 2006, PMID: 16543446). While effective in disrupting biofilms and sensitizing resistant strains, the clinical use of such agents must be carefully managed due to the risk of systemic electrolyte depletion and potential toxicity to host physiological processes.

Other names

Divalent cationsMagnesium (Mg2+)Calcium (Ca2+)Zinc (Zn2+)Ferrous iron (Fe2+)Manganese (Mn2+)Divalent metal cations

Chelation and sequestration of divalent cations to disrupt bacterial membrane integrity and biofilm architecture.