Broad microbial surfaces

Broad microbial surfaces encompass the diverse structural and functional components that constitute the exterior boundaries of bacteria, fungi, and viruses (Mogensen, 2009). This includes the bacterial cell wall (peptidoglycan), the outer membrane of Gram-negative bacteria (lipopolysaccharides), fungal cell walls (chitin and ergosterol-containing membranes), and viral envelopes (Trimble et al., 2016). These surfaces serve as the primary interface between the pathogen and the host environment, providing structural integrity, protection against osmotic stress, and mediating adhesion and nutrient transport. In pharmacology, these surfaces are targeted by various antimicrobial classes; for instance, polymyxins bind to lipopolysaccharides to disrupt the outer membrane, while daptomycin inserts into the cytoplasmic membrane to cause depolarization (Humphries et al., 2013). Because these surfaces often contain highly conserved motifs known as pathogen-associated molecular patterns (PAMPs), they are also the primary targets for the host's innate immune system via pattern recognition receptors (PRRs). Therapeutic challenges include ensuring selectivity to avoid damaging host cell membranes and managing the emergence of resistance through surface modification (Mahlapuu et al., 2016).

Other names

Microbial cell surfaceMicrobial envelopePathogen-associated molecular patternsPAMPsMicrobial cell wall and membrane

Drugs targeting broad microbial surfaces typically act through physical disruption of the lipid bilayer (membrane lysis), binding to conserved structural components like lipopolysaccharides or peptidoglycan, or inhibiting the biosynthesis of essential surface polymers (Trimble et al., 2016; Mahlapuu et al., 2016).