Microbial lipid membranes and structural proteins

Microbial lipid membranes and structural proteins constitute the essential physical boundaries and internal frameworks of bacteria, fungi, and viruses (NIH, 2023). These components are vital for maintaining osmotic pressure, facilitating nutrient transport, and providing the structural rigidity necessary for survival and replication (StatPearls, 2023). In many pathogens, these structures contain unique molecules not found in human cells, such as ergosterol in fungi or lipopolysaccharides and specific phospholipids in bacteria, which allow for targeted antimicrobial therapy (Gray et al., 2014; Velkov et al., 2013). Drugs targeting these structures often work by inducing physical disruption, such as pore formation or depolarization, leading to rapid cell death (Taylor and Palmer, 2016). For example, daptomycin targets bacterial membranes by binding to phosphatidylglycerol in a calcium-dependent manner, while polymyxins interact with the lipopolysaccharides of Gram-negative bacteria (Taylor and Palmer, 2016; Velkov et al., 2013). Consequently, these membranes and proteins are primary targets for a wide range of antibiotics, antifungals, and certain antiviral agents used to treat systemic and localized infections (PubMed, 2022).

Other names

Bacterial cell membraneFungal cell membraneViral envelopeMicrobial cell wall componentsCytoplasmic membrane

Drugs targeting these structures typically act through physical disruption of the lipid bilayer, such as pore formation, depolarization of the membrane potential, or sequestration of essential lipids like ergosterol, leading to loss of cytoplasmic contents and cell death (Taylor and Palmer, 2016; Gray et al., 2014; Velkov et al., 2013).