Bacterial cell wall and cytoplasmic membrane

The bacterial cell wall and cytoplasmic membrane are fundamental structures that maintain the integrity and viability of bacterial cells. The cell wall, characterized by its peptidoglycan content, provides mechanical strength to withstand high internal osmotic pressure, while the underlying cytoplasmic membrane acts as a selective barrier for nutrient transport and energy production [1][3]. These components are primary targets for many classes of antibiotics because their unique composition—such as the presence of D-amino acids in peptidoglycan—allows for selective toxicity against pathogens without harming eukaryotic host cells [2]. Beta-lactam antibiotics and glycopeptides interfere with the assembly and cross-linking of the peptidoglycan layer, leading to osmotic lysis and cell death. Meanwhile, lipopeptides and polymyxins target the cytoplasmic membrane, causing depolarization or physical disruption that results in the leakage of essential intracellular contents [3][4]. These targets are central to the treatment of diverse bacterial infections, ranging from skin infections to life-threatening sepsis. However, the clinical utility of drugs hitting these targets is increasingly threatened by the evolution of complex bacterial resistance mechanisms, such as modified penicillin-binding proteins or altered membrane charges [1].

Other names

Bacterial cell envelopePeptidoglycan layerBacterial plasma membraneBacterial envelope

Inhibition of peptidoglycan synthesis via binding to penicillin-binding proteins (PBPs) or lipid precursors, and disruption of membrane potential or physical integrity [1][2][4].