Plasma membrane phospholipids and general membrane structures

The plasma membrane is a fundamental biological structure composed of a phospholipid bilayer interspersed with proteins and sterols, serving as the primary barrier between the intracellular and extracellular environments (Molecular Biology of the Cell, 4th ed.). It plays a vital role in maintaining cellular integrity, regulating the transport of ions and molecules, and facilitating signal transduction through lipid-protein interactions. In therapeutic contexts, the membrane and its constituent phospholipids are targeted primarily by antimicrobial and antifungal agents that exploit biochemical differences between host and pathogen membranes, such as the presence of ergosterol in fungi or specific anionic lipids in bacteria (PubMed, PMID: 31503155). For example, polyene antifungals like amphotericin B create lethal pores by binding to membrane sterols, while lipopeptide antibiotics like daptomycin cause rapid depolarization by inserting into the lipid matrix (StatPearls, 2023). Despite their efficacy, drugs targeting general membrane structures often face challenges related to systemic toxicity and a narrow therapeutic window because of the structural similarities between human and microbial lipid bilayers (NIH, 2022).

Other names

Cell membraneLipid bilayerPlasma membrane lipidsMembrane phospholipidsCytoplasmic membrane

Drugs targeting membrane structures typically act through physical disruption, such as pore formation, sequestration of essential lipids like ergosterol, or alteration of membrane tension and fluidity, leading to loss of cytoplasmic contents and cell death (StatPearls, 2023; PubChem, 2024).