Cellular lipid bilayers and membrane-associated proteins

Cellular lipid bilayers and membrane-associated proteins constitute the fundamental structural and functional framework of biological membranes, separating the internal cellular environment from the exterior [7, 8]. The lipid bilayer, primarily composed of phospholipids, provides a semi-permeable barrier, while membrane-associated proteins—including integral, peripheral, and lipid-anchored types—mediate critical processes such as signal transduction, molecular transport, and cell-cell recognition [3, 7, 8]. These structures are essential for maintaining cellular homeostasis and are involved in the pathogenesis of numerous conditions, including cancer, cardiovascular diseases, and neurological disorders [2, 6, 14]. Approximately 30% of the human proteome consists of membrane proteins, which serve as the primary targets for over 50% of all FDA-approved drugs [3, 8, 19]. Pharmacological agents may act by directly disrupting the lipid bilayer, modulating its physical properties like fluidity, or binding to specific receptors, ion channels, and transporters embedded within the membrane [5, 11, 20]. Despite their therapeutic importance, targeting these components presents significant challenges due to their structural complexity and the potential for off-target toxicity in non-diseased tissues [1, 3, 18].

Other names

Cell membranePlasma membraneBiological membraneCytoplasmic membranePhospholipid bilayer

Drugs interact with this target by disrupting lipid bilayer integrity, modulating membrane fluidity, or binding to specific integral or peripheral membrane proteins (receptors, ion channels, transporters) to alter signaling, transport, or enzymatic activity [3, 5, 11, 16, 20].