Microbial cell surfaces, membranes, and proteins

Microbial cell surfaces, membranes, and proteins encompass the essential outer structures of bacteria, fungi, and viruses that maintain cellular integrity and mediate interactions with the host. These components include the bacterial peptidoglycan cell wall, the fungal ergosterol-containing membrane, and various surface proteins involved in adhesion and nutrient transport (StatPearls, 2023). Because many of these structures are unique to microorganisms, they are primary targets for antimicrobial drugs, which aim for selective toxicity to minimize damage to human cells (PubMed, 2021). For instance, beta-lactam antibiotics inhibit the cross-linking of peptidoglycan, while polymyxins act as detergents to disrupt the outer membrane of Gram-negative bacteria. In fungi, polyene antibiotics bind to ergosterol to create pores in the membrane, leading to leakage of cellular contents. Despite their effectiveness, these targets are subject to various resistance mechanisms, such as enzymatic degradation of drugs or structural modifications of the target site. Understanding the molecular architecture of these surfaces is crucial for developing next-generation therapeutics that can overcome increasing rates of antimicrobial resistance.

Other names

Microbial cell envelopeBacterial cell wallFungal cell membraneBacterial membrane proteinsSurface antigens

Antimicrobial agents targeting these structures function by inhibiting the biosynthesis of the cell wall, disrupting the physical integrity of the cytoplasmic or outer membrane, or blocking the function of essential surface-associated proteins and transporters (StatPearls, 2023; PubMed, 2021).