Microbial cytoplasmic membrane and cell wall

The microbial cytoplasmic membrane and cell wall are essential structural layers that protect prokaryotic and fungal cells from environmental stress and osmotic lysis. The cell wall provides mechanical rigidity through complex polymers like peptidoglycan in bacteria or chitin and glucans in fungi, while the underlying cytoplasmic membrane serves as a selective barrier and a site for critical metabolic processes, including energy production and signal transduction [1, 2, 3, 7]. These structures are premier targets for antimicrobial therapy because they contain unique molecular features—such as D-amino acids and ergosterol—that are absent in human cells, enabling high selective toxicity [10, 11, 12]. Antibiotics like beta-lactams and glycopeptides disrupt cell wall synthesis, leading to rapid bactericidal effects, whereas membrane-targeting agents like polymyxins and lipopeptides compromise the lipid bilayer's integrity to cause lethal ion leakage [5, 6, 9]. Despite their historical success, the clinical utility of drugs hitting these targets is increasingly challenged by the evolution of resistance mechanisms, such as target site modification and enzymatic inactivation [1, 13, 15].

Other names

Bacterial cell wallBacterial cytoplasmic membraneProkaryotic cell envelopeMicrobial cell envelopePeptidoglycan layerPlasma membrane (microbial)

Inhibition of peptidoglycan synthesis (transpeptidation and transglycosylation), disruption of membrane integrity via pore formation or detergent-like action, inhibition of beta-glucan synthesis, and binding to membrane sterols to increase permeability.