Microbial cell wall components and surface structures

Microbial cell wall components and surface structures represent a broad class of essential structural elements found in bacteria and fungi that are critical for maintaining cellular integrity and mediating interactions with the host environment [Sarkar et al., 2021, PubMed]. In bacteria, the cell wall is primarily composed of peptidoglycan, a complex polymer that provides mechanical strength to withstand high internal osmotic pressure; in Gram-negative species, this is further protected by an outer membrane containing lipopolysaccharides (LPS) [Raetz & Whitfield, 2002, PubMed]. Fungal cell walls differ by utilizing chitin and beta-glucans to provide rigidity [Garcia-Rubio et al., 2020, PubMed]. Because these structures are unique to microbes and absent in mammalian cells, they serve as primary targets for many of the most effective antimicrobial agents, including beta-lactams, glycopeptides, and echinocandins [StatPearls, 2023]. These drugs typically work by inhibiting the enzymes responsible for synthesizing or cross-linking these structural polymers, leading to cell lysis and death [Sarkar et al., 2021, PubMed]. Additionally, these surface structures are often the first point of contact for the host immune system, acting as potent antigens or pathogen-associated molecular patterns (PAMPs) that drive the inflammatory response during infection [NIH, 2022].

Other names

Bacterial cell wallFungal cell wallMicrobial surface componentsCell wall envelopePeptidoglycan layer

Inhibition of peptidoglycan synthesis and cross-linking, inhibition of beta-glucan synthesis, and disruption of outer membrane integrity [StatPearls, 2023].