期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 120, 期 12, 页码 3140-3147出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcb.6b01225
关键词
-
资金
- Ministry of Science and Technology of China [2013CB910200]
- National Natural Sciences Foundation of China [21173258]
- 1000 Young Talents Program of China
The presence of intracellular filamentous alpha-synuclein (alpha S) aggregates is a common feature in Parkinson's disease. Recombinant expressed and purified human alpha S is also capable of forming fibrils in vitro. Many studies have shown that solution conditions heavily influence alpha S fibrillation kinetics, fibril structure, and morphology that exhibit differential biological effects. Nevertheless, the alpha S ensemble structure in various solution conditions is not well characterized; furthermore, how the initial solution ensemble structures impact alpha S assembly kinetics and pathways that result in diverse fibril structure and morphology remains elusive. Here, we mainly employed NMR spectroscopy to characterize the initial ensemble structure of alpha S in the presence or absence of a 150 mM sodium chloride (NaCl) solution, where two polymorphs of alpha S were demonstrated in previous studies. Our data show that alpha S exhibits distinct conformations and fibrillation kinetics in these two solutions. alpha S adopts a more compact and rigid ensemble structure that has faster fibrillation kinetics in the absence of NaCl. On the basis of the ensemble structure and dynamics, we proposed a possible molecular mechanism in which alpha S forms different polymorphs under these two conditions. Our results provide novel insights into how the initial conformation impacts fibrillation pathways and kinetics, suggesting that a microenvironment can be used to regulate the intrinsically disordered proteins assembly.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据