New insight into probe-location dependent polarity and hydration at lipid/water interfaces: comparison between gel- and fluid-phases of lipid bilayers
作者:Moirangthem Kiran Singh、Him Shweta、Mohammad Firoz Khan、Sobhan Sen
DOI:10.1039/c6cp01201a
日期:——
2-dipalmitoyl-sn-glycero-3-phosphocholine) bilayer at room temperature, which was not anticipated in earlier studies. However, the same molecules probe only a subtle but continuous polarity change at the interface of water and the fluid-phase (Lα) DOPC (1,2-dioleoyl-sn-glycero-3-phosphocholine) bilayer at room temperature. Fluorescence quenching experiments indicate that solutes with different log P values adsorb
脂质/水界面处的环境极性和水合作用在膜生物学中起着重要作用,此处使用具有不同亲脂性的新的基于4-氨基邻苯二甲酰亚胺的同源系列荧光分子(4AP-C n;n = 2-10,12 )进行研究。 (辛醇/水分配系数– log P)。我们显示4AP-C n分子在凝胶相(Lβ ')DPPC(1,2-二棕榈酰-sn-甘油)的脂质/水界面处探测到一个特殊的逐步极性(E N T)谱(-3-磷酸胆碱)双层在室温下进行,这是早期研究未曾预期的。然而,在室温下,相同的分子仅探测到水和液相(Lα)DOPC(1,2-二油酰基-sn-甘油-3-磷酸胆碱)双层界面上的细微但连续的极性变化。荧光猝灭实验表明溶质具有不同的log P值在DPPC /水和DOPC /水界面上的不同深度处吸收,这与在界面上观察到的极性分布相关。在八个探针-脂质系统(DPPC和DOPC双层中每个四个-总共2.6μs)上进行的分子动力学模拟支持实