Membrane charge dependent states of the β-amyloid fragment Aβ (16–35) with differently charged micelle aggregates
作者:Manuela Grimaldi、Mario Scrima、Cinzia Esposito、Giuseppe Vitiello、Anna Ramunno、Vittorio Limongelli、Gerardino D'Errico、Ettore Novellino、Anna Maria D'Ursi
DOI:10.1016/j.bbamem.2009.12.012
日期:2010.3
peptides undergo a conformational transition from random coil or alpha-helical monomers, to highly toxic beta-sheet oligomers and aggregate fibrils. The behavior of beta-amyloid peptide at plasma membrane level has been extensively investigated, and membrane charge has been proved to be a key factor modulating its conformational properties. In the present work we probed the conformational behavior of Abeta
Abeta(16-35)是β-淀粉样肽的疏水中心核心,β-淀粉样肽是在阿尔茨海默氏病患者脑组织中发现的斑块的主要成分。取决于目前的条件,β-淀粉样蛋白肽会经历从无规卷曲或α-螺旋单体到高毒性β-折叠低聚物和聚集原纤维的构象转变。β-淀粉样蛋白肽在质膜水平的行为已被广泛研究,并且膜电荷已被证明是调节其构象性质的关键因素。在本工作中,我们探究了Abeta(16-35)响应胶束表面负电荷修饰的构象行为。在带负电荷的纯SDS胶束和“掺杂”的两性离子DPC胶束中进行CD和NMR构象分析 少量的SDS。为了分析Abeta(16-35)与这些胶束系统相互作用的趋势,我们对三种自旋标记的Abeta(16-35)类似物进行了EPR实验,这些类似物带有甲基3-(2,2,5,5- N-末端,序列中间和C末端分别有四甲基-1-氧基吡咯啉基)甲硫基磺酸盐自旋标记。我们的构象数据表明,通过改变膜的负电荷,Abeta(