Bacterial cell wall integrity pathway

The **Bacterial cell wall integrity pathway** comprises the biosynthetic and maturation processes required to maintain the cell wall structure, which is essential for bacterial survival by providing shape, protection from osmotic stress, and resistance to external challenges[1][2][3][5]. The core structure, **peptidoglycan**, is a polymer of sugars and amino acids forming a mesh that withstands internal turgor pressure[1][2][3]. Biosynthesis involves the assembly of precursor molecules in the cytoplasm, their translocation across the plasma membrane, and polymerization and crosslinking by enzymes such as penicillin-binding proteins (PBPs) and SEDS proteins[2][3][5]. The wall may be further decorated with secondary polymers (wall teichoic acids, capsule polysaccharides) or, in Gram-negative bacteria, the outer membrane and proteins like Lpp tether the envelope components together[5]. Targeting enzymes and processes in the pathway has been the foundation for most major classes of antibiotics, including β-lactams and glycopeptides[4][5]. These drugs inhibit crosslinking or polymerization of peptidoglycan, causing cell lysis in growing bacteria. Resistance mechanisms, immune recognition of cell wall fragments, and variations in wall architecture each influence infection, therapy, and diagnostics[4][5]. The cell wall integrity pathway should be viewed as a **therapeutic target class** rather than a discrete molecular entity, requiring further specification for downstream structuring of individual drug targets.

Other names

Bacterial cell wall synthesis pathwayCell wall biosynthesis pathwayPeptidoglycan biosynthesis pathwayCell envelope maintenance pathwayCell envelope integrity pathway(sometimes referred to by specific molecular components, e.g. penicillin-binding proteins, peptidoglycan enzymes)

Inhibition of peptidoglycan crosslinking (β-lactams); Inhibition of peptidoglycan polymerization (glycopeptides); Disruption of precursor transport (bacitracin, MurJ inhibitors); Disruption of cell wall assembly or maturation