Bacterial cell wall and biofilm matrix

The **bacterial cell wall and biofilm matrix** refers to the combination of the classical bacterial cell envelope (peptidoglycan, teichoic acids in Gram-positive, or outer membrane and lipopolysaccharide in Gram-negative bacteria) and the extracellular matrix that encases bacterial communities in **biofilms**. The biofilm matrix, also termed the *extracellular polymeric substance (EPS) matrix* or *matrixome*, is a highly structured, self-produced assembly of biopolymers including **polysaccharides, proteins, nucleic acids (extracellular DNA), lipids, and sometimes extracellular vesicles**[1][4][5][7]. This matrix provides structural support, mediates adhesion to biotic and abiotic surfaces, protects resident bacteria from environmental insults (desiccation, antimicrobials, immune attack), and organizes multicellular behavior such as quorum sensing and horizontal gene transfer[1][2][3][5][7]. Typical molecular components and their functions include: - **Polysaccharides** (main structural scaffold, e.g., cellulose, PIA, alginate) - **Proteins** (adhesins, amyloids like curli, surface appendages) - **Extracellular DNA (eDNA)** (structural connectivity, adhesion, gene exchange) - **Lipids** and **outer membrane vesicles** (modulation of matrix consistency, signaling, nutrient transport)[1][3][4][6][7]. The biofilm matrix is **not a single molecular target but a complex, dynamic supramolecular assembly** that functions as a protective niche for bacteria. Its role in chronic infections and antibiotic resistance makes the bacterial cell wall and especially the biofilm matrix a key *anti-infective therapeutic target*, although it is much broader and less precisely defined than classic molecular targets like specific receptors or enzymes[7]. Drug development focuses on enzymes or molecules that degrade or disrupt major matrix components, thereby increasing antibiotic efficacy and host clearance[2][8]. Analysis and targeting of the matrix are complicated by its dynamic nature, species/strain heterogeneity, and the role of environmental and host-derived factors[2][4][7]. **Note:** - The entry "Bacterial cell wall and biofilm matrices" is overly broad and refers to a collection of diverse molecular entities, not a single, well-defined target. This makes it a non-standard therapeutic target in the sense used for classic drug discovery (it is not a receptor, enzyme, or protein family, but a structural complex). This should be considered in ontology mapping and structuring[1][7]. - For structured drug-target databases, it would be appropriate to refer to specific, well-defined matrix components (e.g., "Curli amyloid fiber," "Polysaccharide intercellular adhesin," "Cellulose synthase") as targets rather than the general matrix itself. For more details on composition, function, and disruption strategies, see references[1][2][3][4][5][6][7][8].

Other names

Bacterial extracellular matrixBiofilm extracellular polymeric substance matrixBacterial biofilm matrixBiofilm matrix

Enzymatic degradation of matrix components (e.g., DNA, polysaccharides, proteins) - Disruption of matrix assembly or adhesion - Inhibition of biofilm maturation