Microbial cell wall and cell membrane

The microbial cell wall and cell membrane are fundamental structural components essential for the survival, integrity, and environmental adaptation of bacteria and fungi. The cell wall provides mechanical strength and protects the organism against high internal osmotic pressure, with its composition varying between Gram-positive bacteria (thick peptidoglycan), Gram-negative bacteria (thin peptidoglycan and an outer membrane), and fungi (chitin and glucans) (Cold Spring Harbor Perspectives in Biology, 2010; Nature Reviews Microbiology, 2017). The underlying cell membrane is a lipid bilayer that acts as a semi-permeable barrier, regulating nutrient transport and hosting critical enzymes for energy metabolism and signal transduction (PNAS, 2010). These structures are primary targets for antimicrobial therapy because they contain unique biochemical components, such as peptidoglycan and ergosterol, which are absent in human cells, allowing for high selective toxicity (Nature Reviews Microbiology, 2010). Drugs targeting these structures work by either inhibiting the synthesis of essential building blocks or by directly compromising the physical integrity of the membrane, leading to rapid cell lysis or growth arrest (Journal of Family Medicine and Primary Care, 2017).

Other names

Bacterial cell wallFungal cell wallCytoplasmic membranePlasma membranePeptidoglycan layerOuter membrane

Inhibition of peptidoglycan cross-linking via penicillin-binding proteins (PBPs); inhibition of cell wall precursor transport; direct disruption of membrane phospholipid bilayers; formation of transmembrane pores leading to ion leakage; inhibition of ergosterol biosynthesis; inhibition of beta-glucan synthesis (StatPearls, 2023; Nature Reviews Microbiology, 2017).