Bacterial cell membrane and associated surface components

The bacterial cell membrane and its associated surface components, including the peptidoglycan layer and the outer membrane of Gram-negative species, constitute the essential physical barrier of the bacterial cell (Silhavy et al., 2010). These structures are vital for maintaining cellular homeostasis, facilitating nutrient transport, and anchoring the machinery for cell wall synthesis and energy metabolism (Strahl & Hamoen, 2010). In pathogenic bacteria, surface components like lipopolysaccharides (LPS) and teichoic acids play critical roles in host-pathogen interactions and immune evasion (Brown et al., 2013). Antibiotics such as polymyxins and daptomycin specifically target these structures to induce membrane permeabilization or depolarization, resulting in rapid bacterial cell death (Taylor & Palmer, 2016). While these targets offer high selectivity due to structural differences between prokaryotic and eukaryotic membranes, therapeutic challenges include the development of resistance and potential host toxicities (Poirel et al., 2017). For instance, polymyxins are often reserved as last-resort treatments due to their potential for nephrotoxicity and neurotoxicity in humans (Poirel et al., 2017). Additionally, the emergence of plasmid-mediated resistance, such as the mcr-1 gene, poses a significant threat to the efficacy of drugs targeting the bacterial membrane (Liu et al., 2016). Understanding the complex assembly and maintenance of these surface components remains a key area for the development of next-generation antimicrobial therapies (Silver, 2011).

Other names

Bacterial cytoplasmic membraneBacterial plasma membraneBacterial cell envelopeBacterial outer membraneBacterial surface assembly

Disruption of membrane integrity, induction of rapid depolarization, pore formation, and inhibition of cell wall precursor transport (Taylor & Palmer, 2016; Silver, 2011).