Microbial biofilm extracellular polymeric substance matrix (EPS matrix)

The microbial biofilm extracellular polymeric substance (EPS) matrix is a complex, self-produced scaffold composed of extracellular polysaccharides, proteins, lipids, and extracellular DNA (eDNA) that encases microbial communities (Flemming & Wingender, 2010, Nature Reviews Microbiology). It serves as the primary structural component of biofilms, providing mechanical stability and acting as a protective barrier against environmental stressors, host immune responses, and antimicrobial agents (Ciofu et al., 2022, Nature Reviews Microbiology). In clinical settings, the EPS matrix is a major factor in the persistence of chronic infections, such as those found in cystic fibrosis lungs, chronic wounds, and on indwelling medical devices (Karygianni et al., 2020, Journal of Clinical Medicine). Therapeutic strategies targeting the EPS matrix aim to degrade its structural components or inhibit their synthesis, thereby dispersing the biofilm and sensitizing the resident microbes to conventional antibiotics and immune clearance (Teschler et al., 2015, Nature Reviews Microbiology). Drugs like Dornase alfa target the eDNA component to reduce mucus viscosity in respiratory infections, while various glycoside hydrolases are being investigated to disrupt the polysaccharide framework (StatPearls, 2023).

Other names

Extracellular polymeric substancesEPSBiofilm matrixSlime layerGlycocalyxExtracellular matrix of biofilms

The mechanism of action involves the enzymatic cleavage of structural polymers such as extracellular DNA and polysaccharides, or the chelation of divalent cations (e.g., Ca2+, Mg2+) that cross-link matrix components, leading to the physical dissolution of the biofilm architecture and increased susceptibility of pathogens to antimicrobials.