Bacterial cell membrane and surface protein

Bacterial cell membranes and surface proteins represent the critical interface between a bacterium and its host environment, serving as both a protective barrier and a platform for essential biological processes. The cytoplasmic membrane is responsible for maintaining the proton motive force, regulating nutrient uptake, and anchoring proteins involved in cell wall biosynthesis and secretion (Silhavy et al., 2010). External proteins, such as adhesins and autolysins, facilitate host cell attachment and environmental adaptation, making them key virulence factors (Foster et al., 2014). In clinical practice, these structures are targeted by several classes of antibiotics; for instance, polymyxins bind to lipopolysaccharides in Gram-negative bacteria to disrupt the outer membrane, while daptomycin inserts into the cytoplasmic membrane of Gram-positive bacteria to cause rapid depolarization (Heidary et al., 2020). Targeting these components is a highly effective strategy for bactericidal activity, although it poses challenges regarding toxicity to host cells and the rapid evolution of bacterial resistance mechanisms.

Other names

Bacterial envelopeBacterial plasma membraneBacterial surfaceomeBacterial outer membraneBacterial cytoplasmic membrane

Drugs targeting these structures typically act by disrupting the physical integrity of the lipid bilayer, forming transmembrane pores, or binding to specific components like lipopolysaccharides (LPS) or lipid II to inhibit cell wall synthesis and cause cytoplasmic leakage (Heidary et al., 2020).