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Bacterial biofilm extracellular polymeric substance matrix (EPS matrix)
- Target
- EPS matrix
- Molecular classification
- Other (complex extracellular matrix, not a single molecule or standard protein/receptor/enzyme), Composed of polysaccharides (exopolysaccharides), Extracellular proteins (many are amyloid-like), Lipids, Extracellular DNA
01
Overview
The bacterial biofilm extracellular polymeric substance matrix is a hydrated, complex network of natural high molecular weight polymers comprising polysaccharides, extracellular proteins (many with amyloid properties), lipids, and extracellular DNA, secreted by microorganisms into their environment. This matrix is essential for biofilm formation, maintenance, and survival, providing mechanical stability, architecture, cellular cohesion, surface adhesion, protection from antimicrobials and host defenses, and enabling metabolic cooperation and communication among biofilm-associated microbes. Its composition and properties vary between organisms and environmental conditions, and it represents a major therapeutic target due to its role in antibiotic tolerance and chronic infection.
- Other names
- Extracellular polymeric substance matrixBiofilm matrixEPS matrixBacterial biofilm matrix
02
Mechanism of action
Disruption or degradation of matrix components (enzymatic cleavage of proteins, polysaccharides, or DNA) Inhibition of matrix synthesis (blocking biosynthetic pathways) Destabilization of biofilm structure, increasing bacterial susceptibility to antibiotics
03
Biological functions
Adhesion to surfaces and cohesion between cellsBiofilm formation and maintenanceProtection against environmental stress (desiccation, antimicrobials, radiation, predation)Immune evasion (barrier to host defenses)Facilitation of horizontal gene transfer and quorum sensingScaffolding and structural supportRegulation of nutrient and metabolite diffusion (external digestive system)
04
Disease associations
Infection (critical in chronic and recalcitrant bacterial infections, medical device-related infections, cystic fibrosis, dental plaque, wound biofilms)Other (can contribute indirectly to inflammation and host tissue damage)
05
Safety considerations
Challenge: Matrix targeting can disrupt biofilms but risks incomplete clearance, exposure of bacterial "persisters," or collateral tissue damageHost-matrix interactions: Some matrix components, if released, can be pro-inflammatory or immunomodulatory
06
Interacting drugs
DNase (degrades extracellular DNA)
4 more in the full profile.
07
Biomarkers
Presence of exopolysaccharides (e.g., cellulose, alginate, Psl, Pel, glucans) detected in biofilm samplesCurli amyloid fibers (in E. coli and related species)Extracellular DNA abundance
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