Microbial cell envelope anionic components

Microbial cell envelope anionic components are negatively charged molecules on the bacterial surface that maintain structural integrity and regulate ion homeostasis (Nature Reviews Microbiology, 2013). In Gram-negative bacteria, the primary anionic component is the lipid A and core oligosaccharide of lipopolysaccharide (LPS), while Gram-positive bacteria utilize teichoic acids and acidic phospholipids like phosphatidylglycerol (PubMed, PMCID: PMC3163956). These components create a high negative surface charge density that is distinct from the relatively neutral surface of mammalian cells, providing a basis for selective toxicity (StatPearls, 2023). Cationic antimicrobial agents, such as polymyxins and daptomycin, target these polyanions through electrostatic attraction, which leads to the displacement of stabilizing divalent cations and subsequent membrane permeabilization (Journal of Biological Chemistry, 2017). This interaction results in the leakage of essential intracellular components and rapid bacterial cell death, making these components vital targets for treating multi-drug resistant infections (Clinical Microbiology Reviews, 2019). Furthermore, modifications to these anionic components, such as the addition of 4-amino-4-deoxy-L-arabinose to LPS, are a primary mechanism by which bacteria develop resistance to these life-saving drugs (Frontiers in Microbiology, 2020).

Other names

Bacterial surface polyanionsAnionic cell wall componentsLipopolysaccharide (LPS)Teichoic acidsAcidic phospholipids

Electrostatic binding of cationic drugs to anionic surface components, displacement of divalent cations (Mg2+ and Ca2+), and subsequent membrane disruption or pore formation leading to cell lysis.