Bacterial biofilm extracellular polymeric substance (EPS) and adherence interface (EPS)

Bacterial biofilm extracellular polymeric substances (EPS) and adherence interfaces constitute the functional scaffold and protective microenvironment for microbial communities. Composed of a heterogeneous mixture of exopolysaccharides, proteins, extracellular DNA (eDNA), and lipids, the EPS matrix facilitates the irreversible attachment of bacteria to surfaces and provides mechanical stability to the biofilm (Flemming & Wingender, 2010, Nature Reviews Microbiology). This structure serves as a formidable barrier that limits the diffusion of antibiotics and shields bacteria from phagocytosis and other host immune effectors, contributing to the high level of antimicrobial tolerance observed in chronic infections (Costerton et al., 1999, Science). Clinically, EPS is a critical factor in persistent infections associated with cystic fibrosis, chronic wounds, and indwelling medical devices such as catheters and heart valves (Donlan, 2001, Emerging Infectious Diseases). Therapeutic interventions targeting the EPS and adherence interfaces involve the use of matrix-degrading enzymes, such as Dornase alfa for degrading eDNA or Dispersin B for polysaccharides, as well as small molecules that inhibit initial adhesion or disrupt signaling pathways like quorum sensing (Parsek & Singh, 2003, Annual Review of Microbiology). By compromising the structural integrity of the EPS, these agents aim to restore the efficacy of standard antimicrobial therapies and facilitate the clearance of recalcitrant infections.

Other names

Biofilm matrixExtracellular matrix of bacteriaGlycocalyxExopolysaccharide matrixBiofilm scaffoldSlime layer

Enzymatic degradation of extracellular DNA and polysaccharides, inhibition of matrix assembly, disruption of bacterial attachment to surfaces, and enhancement of antimicrobial penetration through the physical barrier.