Microbial cell wall and cytoplasmic membrane components

Microbial cell walls and cytoplasmic membranes are essential structural and functional barriers that protect bacteria and fungi from environmental stress and maintain cellular homeostasis [1, 5]. The cell wall, characterized by peptidoglycan in bacteria and chitin or glucans in fungi, provides mechanical strength and prevents osmotic lysis [2, 4]. The cytoplasmic membrane serves as a selective permeability barrier and a site for critical processes like energy metabolism and nutrient transport [3, 5]. These components are prime targets for antimicrobial agents because they often contain unique molecular structures not found in human cells, such as peptidoglycan and ergosterol, allowing for selective toxicity [1, 3]. Drugs targeting these structures include beta-lactams and glycopeptides, which inhibit cell wall synthesis, and polymyxins or polyenes, which disrupt membrane integrity [1, 6]. However, the broad nature of this target group means that drugs must be carefully selected to avoid host toxicity and to combat the rising challenge of antimicrobial resistance [4, 6].

Other names

Bacterial cell wallFungal cell wallPeptidoglycan layerCytoplasmic membranePlasma membraneCell envelope

Inhibition of peptidoglycan synthesis by binding to penicillin-binding proteins (PBPs); sequestration of lipid-linked precursors like Lipid II; disruption of membrane integrity through detergent-like effects on phospholipids or lipopolysaccharides; pore formation via binding to sterols (e.g., ergosterol); and inhibition of cell wall carbohydrate synthesis (e.g., beta-glucans) [1, 3, 4].