Bacterial cytoplasmic membrane and cell surface

The bacterial cytoplasmic membrane and cell surface are essential structures that define the boundary of the bacterial cell and maintain its physiological integrity (Silhavy et al., 2010). The cytoplasmic membrane consists of a phospholipid bilayer that houses proteins responsible for critical processes such as ATP synthesis, nutrient transport, and signal transduction. Surrounding this membrane is the cell surface, which includes the peptidoglycan cell wall and, in Gram-negative bacteria, an outer membrane containing lipopolysaccharides. These structures provide mechanical strength to withstand osmotic pressure and act as a selective barrier against toxic substances. Because the composition of bacterial membranes and walls differs significantly from those of eukaryotic cells, they are prime targets for antimicrobial therapy (Straus & Hancock, 2006). Antibiotics like polymyxins and daptomycin target these structures by binding to specific components, such as lipopolysaccharides or acidic phospholipids, leading to membrane permeabilization (Poirel et al., 2017). This disruption results in the leakage of essential ions and molecules, loss of membrane potential, and ultimately rapid bacterial cell death.

Other names

Bacterial cell envelopeBacterial plasma membraneBacterial inner membraneBacterial cell wallBacterial outer membrane

Disruption of membrane integrity through binding to specific lipids or lipopolysaccharides, leading to pore formation, depolarization, and the leakage of intracellular contents.