Pseudomonas aeruginosa biofilm extracellular polymeric substance matrix (P. aeruginosa biofilm EPS)

The Pseudomonas aeruginosa biofilm extracellular polymeric substance (EPS) matrix is a complex, self-produced scaffold that encases bacterial cells, facilitating their survival in hostile environments. It is primarily composed of three exopolysaccharides—Alginate, Pel, and Psl—along with extracellular DNA (eDNA), proteins, and lipids, which together provide structural integrity and act as a protective barrier against the host immune system and antimicrobial agents (Mann & Wozniak, 2012, PMID: 22821337). In clinical contexts, the matrix is a major driver of chronic infections, particularly in the lungs of cystic fibrosis patients, where it contributes to the high morbidity associated with persistent P. aeruginosa colonization (Flemming & Wingender, 2010, PMID: 20634811). Therapeutic targeting of the matrix involves using agents like Dornase alfa to degrade eDNA or glycoside hydrolases to break down polysaccharides, thereby 'priming' the biofilm for clearance by conventional antibiotics or the immune system (Tielen et al., 2013, PMID: 23833245). Understanding the spatial organization and chemical composition of this matrix is critical for developing anti-biofilm strategies that can penetrate these resilient microbial communities (Karygianni et al., 2020, PMID: 32429152).

Other names

Extracellular polymeric substancesEPS matrixBiofilm matrixExopolysaccharide matrixPseudomonas aeruginosa biofilm extracellular matrix

Enzymatic degradation of extracellular DNA (eDNA) or polysaccharides (Alginate, Pel, Psl) to destabilize the biofilm structure; chelation of metal ions (calcium, iron) required for matrix cross-linking; inhibition of EPS biosynthesis; enhancement of antibiotic penetration through physical disruption of the matrix barrier.