Bacterial cell membrane and surface biomolecules

Bacterial cell membranes and surface biomolecules encompass the complex structural layers that define the boundary between a bacterium and its environment [Nature Reviews Microbiology, 2015]. This collective target includes the inner cytoplasmic membrane, the peptidoglycan cell wall, and, in Gram-negative bacteria, an outer membrane rich in lipopolysaccharides (LPS) and porins [NIH, 2022]. These structures are essential for maintaining osmotic pressure, regulating the transport of ions and nutrients, and facilitating interactions with host cells during infection. Because these components are often unique to prokaryotes or significantly different from eukaryotic counterparts, they serve as primary targets for numerous antibiotic classes [PubMed, 2021]. For example, beta-lactams inhibit cell wall synthesis, while polymyxins and lipopeptides like daptomycin directly disrupt membrane integrity [StatPearls, 2023]. However, the broad nature of this "target" means that drugs often face challenges such as poor penetration through the outer membrane or the rapid evolution of resistance mechanisms like efflux pumps and surface modification [Microbiology and Molecular Biology Reviews, 2017].

Other names

Bacterial cell envelopeBacterial cell wallBacterial plasma membraneSurface-exposed biomoleculesBacterial outer membrane

Drugs targeting these structures typically act by disrupting the physical integrity of the lipid bilayer (e.g., polymyxins), inhibiting the biosynthesis of cell wall components like peptidoglycan (e.g., beta-lactams), or forming pores that lead to ion leakage and cell death (e.g., daptomycin) [StatPearls, 2023; PubMed, 2021].