Microbial cytoplasmic and mitochondrial lipid membranes

Microbial cytoplasmic and mitochondrial lipid membranes are fundamental lipid bilayers that serve as the primary barrier and metabolic hub for bacteria, fungi, and eukaryotic organelles. In prokaryotes, the cytoplasmic membrane is responsible for maintaining the proton motive force, synthesizing cell wall precursors, and hosting the electron transport chain [1]. Mitochondria, which evolved from ancestral bacteria via endosymbiosis, retain similar membrane characteristics, such as the presence of cardiolipin and a high protein-to-lipid ratio in the inner membrane [2]. Therapeutic agents like polymyxins and daptomycin target these membranes by binding to specific lipid components, leading to membrane thinning, pore formation, and rapid depolarization [3][4]. While these mechanisms provide potent antimicrobial activity, the structural homology between microbial and human mitochondrial membranes often results in dose-limiting toxicities, including nephrotoxicity and neurotoxicity [5].

Other names

Bacterial cytoplasmic membraneFungal plasma membraneInner mitochondrial membraneOuter mitochondrial membraneProkaryotic cytoplasmic membraneBacterial inner membrane

Disruption of membrane integrity through binding to specific lipid components (e.g., lipopolysaccharides, phosphatidylglycerol, or ergosterol), resulting in pore formation, depolarization, and the leakage of essential intracellular ions and metabolites [1][3][4].