Cell membrane lipids and membrane-associated proteins

The cell membrane is a complex and dynamic assembly of lipids and proteins that defines the boundary of the cell and its organelles, serving as a selective barrier and a platform for essential biological processes (Alberts et al., Molecular Biology of the Cell). Lipids, primarily phospholipids, cholesterol, and sphingolipids, form a semi-permeable bilayer that provides structural integrity and regulates the fluidity necessary for the proper function of embedded proteins (Maxfield & van Meer, 2010, Nature Reviews Molecular Cell Biology). Membrane-associated proteins, including integral receptors, transporters, and peripheral enzymes, facilitate signal transduction, nutrient uptake, and cell-cell communication (Santos et al., 2017, Nature Reviews Drug Discovery). In various pathological states, such as cancer and bacterial infections, the composition and organization of these membrane components are significantly altered to support disease progression (Escribá et al., 2008, Journal of Cellular and Molecular Medicine). Pharmacologically, the membrane can be targeted directly by agents that disrupt lipid bilayers, such as antifungal and antibacterial drugs, or indirectly by modulating the activity of proteins through changes in the lipid microenvironment (Gray et al., 2012, PNAS). Understanding the intricate interplay between lipids and proteins is crucial for developing therapies that can selectively penetrate or modify cellular membranes to treat infections, metabolic disorders, and malignancies.

Other names

Plasma membrane componentsCell membrane bilayerMembrane proteome and lipidomeCellular envelope components

Therapeutic agents targeting these components typically function by binding to specific lipids, such as ergosterol in fungi, to create transmembrane pores that lead to the leakage of essential ions and subsequent cell death (Baginski & Czub, 2009, Current Drug Metabolism). Other mechanisms include the disruption of bacterial membrane potential through calcium-dependent insertion into the lipid bilayer or the modulation of membrane-bound protein activity by altering the surrounding lipid environment and membrane fluidity, a strategy often referred to as membrane-lipid therapy (Escribá, 2006, Trends in Molecular Medicine; Taylor & Palmer, 2016, Frontiers in Microbiology).