Bacterial biofilm extracellular polymeric substances matrix (EPS matrix)

The bacterial biofilm extracellular polymeric substances (EPS) matrix is a complex, self-produced scaffold composed of polysaccharides, proteins, lipids, and extracellular DNA (eDNA) that surrounds and protects microbial communities (Flemming & Wingender, 2010, Nature Reviews Microbiology). Its primary biological functions include facilitating surface adhesion, providing structural stability, and acting as a protective barrier against environmental stressors and host immune defenses. In human disease, the EPS matrix is a critical factor in the persistence of chronic infections, such as those associated with cystic fibrosis, chronic wounds, and indwelling medical devices, by significantly reducing the penetration and efficacy of antimicrobial agents (Hall & Mah, 2017, Nature Reviews Microbiology). Therapeutic strategies targeting the EPS matrix focus on its disruption or degradation using enzymes like Dornase alfa (which targets eDNA) or glycoside hydrolases (which target exopolysaccharides) to disperse the biofilm and sensitize the bacteria to antibiotics (Karygianni et al., 2020, Frontiers in Microbiology). By neutralizing the protective environment of the matrix, these treatments aim to overcome the high levels of antibiotic tolerance characteristic of biofilm-associated pathogens. Furthermore, the matrix serves as a reservoir for nutrients and signaling molecules, facilitating communication and metabolic cooperation within the microbial population (Flemming et al., 2016, Nature Reviews Microbiology).

Other names

Extracellular polymeric substancesEPSBiofilm matrixSlime layerExopolysaccharide matrix

Enzymatic degradation of matrix components (eDNA, polysaccharides), chelation of stabilizing divalent cations, and inhibition of EPS biosynthesis to promote biofilm dispersal and enhance antibiotic penetration.