Pathogenic bacterial and fungal cell membranes

Pathogenic bacterial and fungal cell membranes are essential lipid bilayers that serve as the primary barrier between the microorganism's internal environment and the external host environment. These membranes are critical for maintaining cellular integrity, regulating the transport of nutrients and waste, and facilitating energy production through the maintenance of electrochemical gradients (Nature Reviews Microbiology, 2019). In bacteria, the membrane structure differs significantly between Gram-positive and Gram-negative species, with the latter possessing an additional outer membrane rich in lipopolysaccharides (LPS) that acts as a potent endotoxin and a barrier to many antibiotics (Pharmacological Reviews, 2019). Fungal membranes are uniquely characterized by the presence of ergosterol, a sterol that maintains membrane fluidity and function, which is absent in mammalian cells (Clinical Microbiology Reviews, 2006). Therapeutic agents targeting these membranes, such as polymyxins for bacteria and polyenes for fungi, typically act by binding to specific lipid components or sterols to induce pore formation and rapid cell death (Journal of Biological Chemistry, 2013). While highly effective, the structural similarities between microbial and host membranes can lead to significant toxicities, particularly nephrotoxicity, necessitating careful clinical management.

Other names

Microbial cell membranesBacterial cytoplasmic membraneFungal plasma membraneBacterial outer membraneMicrobial lipid bilayer

Direct disruption of the lipid bilayer integrity, formation of transmembrane pores leading to ion leakage (e.g., K+), depolarization of the cytoplasmic membrane, and binding to specific membrane components such as lipopolysaccharide (LPS) in Gram-negative bacteria or ergosterol in fungi.