Microbial cell wall and surface structures

Microbial cell wall and surface structures are essential, complex layers that provide structural rigidity and protect bacteria and fungi from osmotic lysis and environmental stress (StatPearls, Physiology, Bacterial Cell Wall). In bacteria, the cell wall is primarily composed of peptidoglycan, a polymer of sugars and amino acids, while Gram-negative species possess an additional outer membrane containing lipopolysaccharides (LPS) (NIH, NCBI Bookshelf). Fungal cell walls differ significantly, utilizing chitin, glucans, and mannoproteins to maintain integrity (Nature Reviews Microbiology, 2017). Because these structures are unique to microbes and absent in mammalian cells, they are primary targets for selective antimicrobial therapy. Drugs such as beta-lactams and glycopeptides inhibit the synthesis or cross-linking of peptidoglycan, leading to bacterial cell death, while echinocandins target fungal-specific glucan synthesis. Beyond structural support, these surfaces facilitate host cell adhesion and modulate the immune response, making them critical factors in the pathogenesis of infectious diseases.

Other names

Bacterial cell wallFungal cell wallCell envelopePeptidoglycan layerOuter membraneMicrobial surface components recognizing adhesive matrix molecules (MSCRAMMs)

Inhibition of peptidoglycan cross-linking via penicillin-binding proteins (PBPs); inhibition of cell wall precursor synthesis; disruption of the Gram-negative outer membrane; inhibition of 1,3-beta-D-glucan synthase in fungi.