Modulating amyloid-β aggregation: The effects of peptoid side chain placement and chirality.

Modulating amyloid-β aggregation: The effects of peptoid side chain placement and chirality.
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调节淀粉样蛋白-β 聚集:肽侧链布局和手性的影响。

DOI:
10.1016/j.bmc.2016.10.007
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发表时间:
2017
影响因子:
3.5
通讯作者:
Servoss,ShannonL
Servoss,ShannonL
中科院分区:
医学3区
文献类型:
--
作者:
Turner,JPhillip;Chastain,ShelbyE;Park,Dongwon;Moss,MelissaA;Servoss,ShannonL

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阿尔茨海默病(AD)的特征是不可溶的聚集性淀粉样蛋白(Aβ,Aβ)积聚在大脑神经细胞之间的斑块中。AD是美国第六大死因,也是目前无法治疗或治愈的前十大死因中唯一的死因(阿尔茨海默氏症协会,2011;Selkoe,1996)。研究人员一直专注于开发小分子和多肽来防止Aβ聚集;然而,尽管一些化合物在体外看起来很有希望,但这项研究尚未产生可行的治疗方法。我们先前报道了一种基于多肽KLVFf(Aβ的16-20残基)的类肽模拟物(JPT1),它调节Aβ40的聚集,特别是减少形成的纤维状、β片状结构聚集体的总数。在这项研究中,我们研究了JPT1的两个新变体,它们探索了芳香族侧链放置(JPT1s)和侧链手性(JPT1a)的重要性。JPT1和JPT1a都通过减少总的β-Sheet聚集体来调节Aβ40聚集。然而,JPT1a对纤维状Aβ40聚集体的形态也有显著的影响。这些结果表明,在具有不同二级结构的类肽存在时,β40聚集可能遵循不同的途径。更好地了解类肽和Aβ之间的相互作用将有助于改进AD治疗的设计。
Alzheimer’s disease (AD) is characterized by the buildup of insoluble aggregated amyloid-β protein (Aβ) into plaques that accumulate between the neural cells in the brain. AD is the sixth leading cause of death in the United States and is the only cause of death among the top ten that cannot currently be treated or cured (Alzheimer’s Association, 2011; Selkoe, 1996). Researchers have focused on developing small molecules and peptides to prevent Aβ aggregation; however, while some compounds appear promising in vitro, the research has not resulted in a viable therapeutic treatment. We previously reported a peptoid-based mimic (JPT1) of the peptide KLVFF (residues 16–20 of Aβ) that modulates Aβ40 aggregation, specifically reducing the total number of fibrillar, β-sheet structured aggregates formed. In this study, we investigate two new variants of JPT1 that probe the importance of aromatic side chain placement (JPT1s) and side chain chirality (JPT1a). Both JPT1s and JPT1a modulate Aβ40 aggregation by reducing total β-sheet aggregates. However, JPT1a also has a pronounced effect on the morphology of fibrillar Aβ40 aggregates. These results suggest that Aβ40 aggregation may follow a different pathway in the presence of peptoids with different secondary structures. A better understanding of the interactions between peptoids and Aβ will allow for improved design of AD treatments.
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