Bacterial cell membrane and wall

The **bacterial cell membrane and wall** together comprise the cell envelope, the essential structural boundary separating the bacterial cytoplasm from its environment. The **cell wall** is made primarily of peptidoglycan, a rigid mesh of sugar (N-acetylglucosamine and N-acetylmuramic acid) strands crosslinked by peptides, providing mechanical strength, maintaining cell shape, and protecting the cell from osmotic lysis[1][2][3][4][7]. In Gram-positive bacteria, the cell wall is thick and contains teichoic acids; in Gram-negative bacteria, the wall is thin, surrounded by an outer membrane rich in lipopolysaccharide (LPS), and contains an intervening periplasmic space[1][2][7]. The **cell membrane** (plasma membrane) lies beneath the cell wall and consists of a phospholipid bilayer with embedded proteins, functioning in energy transduction, selective transport of solutes, and biosynthesis of cell wall components[5][6]. These structures are major **antibiotic targets**: many first-line antibiotics (such as β-lactams and glycopeptides) act by disrupting cell wall synthesis, while others disrupt the membrane[2][3][5][7]. Selective toxicity is achieved because human cells lack cell walls, but cell envelope targeting can trigger immune responses, and widespread drug resistance poses serious clinical challenges. **Note:** "Bacterial cell membrane and wall" is not the canonical name of a specific single molecular target, but refers to multiple structural macromolecular assemblies. Each represents a complex, druggable feature but not a single protein or gene. For precise target mapping, specific components (e.g., "peptidoglycan synthase," "lipopolysaccharide," "MurA," "penicillin-binding proteins") should be used. This entry aggregates at a higher structural and functional level than standard drug targets[1][2][3].

Other names

bacterial cell envelopebacterial plasma membrane and cell wallbacterial envelope

Inhibition of cell wall synthesis (e.g., β-lactam antibiotics, glycopeptides) - Disruption of cell membrane integrity (e.g., polymyxins, daptomycin) - Inhibition of lipid synthesis needed for wall/membrane (e.g., bacitracin, fosfomycin) - Disruption of peptidoglycan cross-linking