单分子跟踪分析显示,粉样寡合体的表面流动性是由它们的结构结构驱动的
Martino Calamai1, Francesco S Pavone
1University of Florence, European Laboratory for Nonlinear Spectroscopy (LENS), Sesto Fiorentino, Florence 50019, Italy. calamai@lens.unifi.it
Journal of the American Chemical Society
|July 5, 2011
概括
粉样β (Aβ) 寡合体结构决定了细胞膜的移动性. 结构相似的粉样蛋白寡合体,即使来自不同的蛋白质,在活细胞中也表现出相似的扩散动态.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 神经科学是一个神经科学.
背景情况:
- 粉样β (Aβ) 寡合物与细胞毒性有关,其结构多态性可能解释了各种毒性作用.
- 了解Aβ寡合体结构和细胞行为之间的关系对于开发治疗策略至关重要.
研究的目的:
- 为了研究活细胞上具有明显构造的单个Aβ1-42寡合体的膜流动性.
- 探索蛋白质四级结构和膜扩散动态之间的联系.
主要方法:
- 利用形状特异性抗体标记不同结构类型的Aβ1-42寡合体.
- 采用单颗粒追踪技术来监测活细胞等离子体膜上单个寡合物的移动性.
- 将Aβ寡合体的膜动力学与具有相似构造的其他粉样寡合体 (氨酸, Sup35NM) 进行比较.
主要成果:
- 观察到两种Aβ1-42寡合体类型的异质动态行为,具有显著不同的整体流动性.
- 发现具有类似构造但不同组成 (氨基林, Sup35NM) 的粉样寡合体表现出与Aβ1-42寡合体相似的动态行为.
- 建立了氨基酸寡合物的四级结构和它们的膜流动性之间的相关性.
结论:
- 蛋白质四级结构与膜流动性直接相关.
- 结构上相似的超分子蛋白质组合在细胞内表现出类似的扩散模式.
- 这一发现提供了关于粉样蛋白相关细胞功能障碍背后的生物物理机制的见解.
相关概念视频
03:03Amyloid Fibrils
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, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
03:03Amyloid Fibrils
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, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
01:22Protein Folding
Overview