Microbial cell surface anionic components

Microbial cell surface anionic components represent a diverse group of negatively charged molecules found on the exterior of bacteria, yeasts, and within the matrix of biofilms. In Gram-negative bacteria, the primary anionic component is lipopolysaccharide (LPS) in the outer membrane, while Gram-positive bacteria possess teichoic acids (lipoteichoic and wall teichoic acids) and a high proportion of anionic phospholipids like phosphatidylglycerol. Yeasts also display anionic surface characteristics through phosphorylated mannans in their cell walls and specific membrane lipids. In biofilms, the extracellular polymeric substance (EPS) matrix contains anionic polysaccharides and extracellular DNA, which contribute to the overall negative charge and structural stability of the community. These components are critical for maintaining structural integrity, regulating ion homeostasis, and facilitating adhesion to host surfaces. Because human cell membranes are predominantly zwitterionic (neutral), these anionic microbial surfaces serve as a selective therapeutic target for cationic antimicrobial agents, such as polymyxins, daptomycin, and antimicrobial peptides (AMPs). These drugs typically interact via electrostatic attraction, leading to membrane disruption, depolarization, and rapid cell death, making them effective against a broad spectrum of pathogens and drug-resistant strains.

Other names

Bacterial cell membrane and cell surface anionic components across bacteria, yeasts, and biofilmsBacterial cell membrane anionic componentsFungal cell wall anionic componentsBiofilm matrix anionic componentsMicrobial anionic surfaceAnionic cell envelope components

Drugs targeting these components typically utilize electrostatic attraction between their cationic groups and the anionic microbial surface (e.g., LPS, teichoic acids, or phospholipids). This is followed by membrane insertion, which leads to physical disruption, pore formation, and depolarization of the cytoplasmic membrane, ultimately causing cell lysis and death.