Microbial lipid membrane

Microbial lipid membranes are essential biological structures that serve as the primary osmotic barrier and the site for vital metabolic processes, including energy production and cell wall synthesis [1]. These membranes differ significantly from mammalian membranes in their lipid composition; while mammalian membranes are rich in neutral lipids and cholesterol, microbial membranes often contain high proportions of negatively charged lipids like phosphatidylglycerol or specific sterols like ergosterol [2,3]. These biochemical differences provide a basis for selective toxicity, allowing drugs to target microbial cells specifically [4]. For instance, the lipopeptide daptomycin binds to bacterial membranes in a calcium-dependent manner to cause depolarization, while polyene antifungals like amphotericin B bind to ergosterol to form lethal pores [5,6]. Because the membrane is a fundamental structural component, it remains a critical target for overcoming multidrug-resistant pathogens [7]. However, maintaining high selectivity remains a challenge, as some membrane-active agents can cause significant host toxicity, such as the renal damage observed with polymyxins [8].

Other names

Bacterial cell membraneFungal cell membraneCytoplasmic membraneMicrobial plasma membraneBacterial lipid bilayer

Drugs targeting microbial lipid membranes generally act through electrostatic attraction to anionic lipids, followed by membrane insertion, pore formation, and subsequent depolarization or physical disruption of the bilayer integrity [4,5].