Detection of Unusual Lipid Mixing in Cholesterol-Rich Phospholipid Bilayers: The Long and the Short of It
摘要:
Nearest-neighbor recognition studies have revealed that favored sterol-phospholipid associations can be reversed in a fluid bilayer that contains relatively long (high melting) and short (low melting) phospholipids, when the sterol content is sufficiently high; that is, like-lipids now become favored nearest-neighbors. A possible origin of this effect is briefly discussed.
The mixing properties of exchangeable phospholipids, derived from 1,2-dipalmitoyl-sn-glycero3-phosphoethanolamine and 1,2-distearoyl-sn-glycero-3-phosphoethanolamine, with an exchangeable form of cholesterol have been used to monitor the transition from the liquid-disordered to the liquid-ordered phase in cholesterol-containing bilayers, made from 1,2-dipaimitoyl-sn-glycero-3-phosphocholine and 1,2-distearoyl-sn-glycero-3-phosphocholine, respectively.