Biological membrane and divalent cation interaction

Interactions between biological membranes and divalent cations play crucial roles in the structure, stability, and function of all cellular membranes. Divalent cations like Ca²⁺, Mg²⁺, and Zn²⁺ bind to negatively charged regions in membrane lipids (e.g., phosphate headgroups), cross-linking them and increasing rigidity or altering membrane permeability[4][6]. In both prokaryotic and eukaryotic cells, these ions regulate processes such as membrane fusion, attachment of macromolecules, and organization of membrane domains[1][3][7]. For example, in Gram-negative bacteria, divalent cations stabilize the lipopolysaccharide (LPS) layer and confer resistance to antimicrobial peptides[4]. In eukaryotic cells, divalent cations modulate the physical properties of intermediate filaments and contribute to cytoplasmic mechanics[2]. These are general physicochemical phenomena and not discrete, structurally defined molecular entities.

Other names

cation-membrane interactionsdivalent cation binding to membranesmembrane-cation bridging

Some drugs like EDTA act by chelating divalent cations, thereby disrupting membrane integrity