Bacterial cell wall and biofilm

The bacterial cell wall and biofilm represent complex, multi-component extracellular structures critical for bacterial survival, pathogenicity, and antimicrobial resistance. The bacterial cell wall is primarily composed of peptidoglycan and, depending on bacterial type, may include additional components such as lipopolysaccharide (in Gram-negative bacteria) and teichoic acids (in Gram-positive bacteria). Biofilms are specialized communities of bacteria encased in a self-produced matrix of extracellular polymeric substances (EPS) that include polysaccharides, proteins, extracellular DNA, and lipids. Biofilm formation is a regulated, multi-stage process involving surface attachment, EPS production, community maturation, and eventual dispersal. Within a biofilm, bacteria withstand environmental stresses, evade immune responses, and exhibit markedly increased tolerance to antibiotics. These features make biofilms central contributors to persistent infections, device-related complications, and the evolution and spread of antimicrobial resistance. Targeting bacterial cell wall synthesis or biofilm integrity remains a principal strategy in antibacterial drug development, but many therapeutic challenges persist due to these structures' inherent protective roles and dynamics.

Other names

Bacterial biofilmMicrobial biofilmBacterial extracellular matrixBacterial EPSBacterial cell envelope

Disruption of biofilm structure (enzymatic or chemical degradation of matrix); Inhibition of cell wall synthesis (antibiotics, e.g., β-lactams block peptidoglycan cross-linking); Inhibition of quorum sensing signaling; Enhancement of immune clearance by breaking biofilm barrier; Interference with attachment or adhesion processes.