Extracellular polysaccharide matrix (EPS matrix)

The extracellular polysaccharide matrix (often called the EPS matrix) is a key structural and functional component secreted by microbes during biofilm formation. It is primarily composed of exopolysaccharides (such as cellulose, alginate, poly-β-(1→6)-N-acetylglucosamine, Psl, and Pel), but also incorporates proteins, nucleic acids, and sometimes lipids and minerals. This matrix forms a hydrated, three-dimensional network that encases microbial communities, providing them with cohesion, mechanical stability, protection from environmental stresses (e.g., antibiotics, immune response, dehydration), and promoting cellular communication and genetic exchange. The polysaccharide matrix is central to the pathology of many chronic and device-associated infections due to its ability to dramatically increase microbial resistance to antimicrobial agents and host defenses. Its disruption is an attractive therapeutic strategy, though targeting such a heterogeneous, non-protein polymer presents notable scientific, clinical, and safety challenges. The presence of specific polysaccharide components—detectable by biochemical or immunological assays—serves as a biomarker for biofilm and infection status. Overall, while the EPS matrix is not a classic single-protein target, it is a valid therapeutic target in microbial infections, with research ongoing into novel agents directly disrupting this macromolecular structure.

Other names

Extracellular polymeric substance matrixExopolysaccharide matrixBiofilm polysaccharide matrixEPS

Inhibition or enzymatic digestion of polysaccharide components to disrupt matrix integrity and promote biofilm dispersal. Enhancement of antibiotic penetration by matrix modification or degradation. Prevention of biofilm formation by targeting matrix assembly.