过渡网络揭示了由糖氨基甘油或脂质引起的Aβ中的混乱到秩序转换
Moritz Schäffler1,2, Suman Samantray1, Birgit Strodel1,2
1Institute of Biological Information Processing, Structural Biochemistry (IBI-7), Forschungszentrum Jülich, 52428 Jülich, Germany.
International journal of molecular sciences
|July 29, 2023
概括
阿尔茨海默病的研究揭示了粉样β (Aβ) 如何在糖氨基 (GAG) 和脂质附近改变形状. 这些由不同的机制驱动的形状变化影响了Aβ聚合和阿尔茨海默病的发病.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 计算神经科学是一种神经科学.
背景情况:
- 粉样β (Aβ) 聚合,特别是Aβ1-42,与阿尔茨海默病的发病有关.
- 了解Aβ形状变化对于开发治疗策略至关重要.
研究的目的:
- 为了研究由糖氨基甘油 (GAG) 和1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) 脂质诱导的Aβ1-42的构造变化.
- 阐明驱动这些Aβ1-42形状转换的分子机制.
主要方法:
- 利用分子动力学模拟来研究在GAG和POPC脂质的存在下Aβ1-42.
- 通过提取关键结构特征来分析构造变化,以生成过渡网络.
主要成果:
- Aβ1-42从溶液中的无序状态过渡到GAG附近的紧的β-毛结构.
- 在与POPC脂质集群相互作用时,Aβ1-42形成更紧的α-螺旋或β-叶结构.
- 不同的机制驱动这些转变:POPC的脂质疏水性,以及GAG介导的离子去除,增强GAG的内部静电相互作用.
结论:
- GAG和脂质显著影响Aβ1-42的形状偏好.
- 这些形状变化在Aβ聚合成有毒的寡聚体和粉样纤维中发挥着关键作用,有助于阿尔茨海默病.
- 该研究提供了GAG和脂质在调节Aβ结构和聚合中的不同作用的见解.
相关概念视频
Amyloid Fibrils
9.6K
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining,...
9.6K
Oligosaccharide Assembly
2.9K
Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...
Multiple sugar molecules that may or may...
2.9K
Export of Misfolded Proteins out of the ER
3.7K
After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
3.7K


