PROBING ALPHA-SYNUCLEIN AGGREGATION

探测 α-突触核蛋白聚集

• 批准号: 8364109
• 负责人: ELKA R GEORGIEVA
• 金额: $ 0.99万
• 依托单位: CORNELL UNIVERSITY
• 依托单位国家: 美国
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8364109
• 关键词: Amyloid Fibrils; Behavior; Binding; Cysteine; Cytosol; Development; Disease; Dopamine; Environment; Funding; Goals; Grant; Homeostasis; Learning; Lewy Bodies; Link; Maintenance; Membrane; Membrane Proteins; Micelles; Molecular Conformation; National Center for Research Resources; Parkinson Disease; Phospholipids; Physiologic pulse; Point Mutation; Principal Investigator; Property; Proteins; Regulation; Research; Research Infrastructure; Resources; Source; Spin Labels; Structure; Synapses; Technology; United States National Institutes of Health; Variant; alpha synuclein; alpha synuclein gene; cost; mimetics; mutant; presynaptic; protein aggregation

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. Primary support for the subproject and the subproject's principal investigator may have been provided by other sources, including other NIH sources. The Total Cost listed for the subproject likely represents the estimated amount of Center infrastructure utilized by the subproject, not direct funding provided by the NCRR grant to the subproject or subproject staff. Alpha-synuclein (aS) is a highly conserved presynaptic protein that participates in synaptic strength maintenance and dopamine homeostasis. It is also involved in regulation of intracellular dopamine levels at several points of control. However, accumulation of aS amyloid fibrils was implicated as the hallmark in the development of Parkinson's disease. The three single-point mutations in a-synuclein, namely, A30P, A53T, and E46K, (as well as a triplication of the aS gene) have been linked to a rare familial form of Parkinson's disease (PD). On the other hand the vast majority of Lewy body-related disease cases is sporadic and involves the wild type of aS. Normal functions of ¿S involve protein-membrane interactions upon which the protein undergoes transformations from a disordered structure in cytosol to the highly helical one in membrane-bound state. In several completed subprojects we have successfully applied Pulsed dipolar ESR to characterize the behavior of wild type aS bound to SDS micelles and phospholipid membranes [1, 2]. In our detailed study on the structural properties of WT and PD-linked mutants A30P, E46K and A53, we showed that all variants of aS posses the propensity to switch between broken and extended helix conformations, depending on aS environment [1-3]. Yet, there is insufficient information about the factors that trigger and govern the aggregation of this protein. Therefore, we undertook a study that has as its goal to learn whether and how the interaction with the common membrane mimetics, such as SDS, could initiate the aggregation of aS. So far, we have studied the interaction with SDS of single spin-labeled cysteine mutants of aS. [1] Borbat, P.; Ramlall, T. F.; Freed, J. H.; Eliezer, D. J. Am. Chem. Soc., 2006, 128, 10004-10005. [2] Elka R. Georgieva, Trudy F. Ramlall, Peter P. Borbat, Jack H. Freed, David Eliezer, J. Am. Chem. Soc. 2008, 130, 12856-12857. [3] E.R. Georgieva, T.F. Ramlall, P.P. Borbat, J.H. Freed, D. Eliezer, J Biol Chem, 285 (2010) 28261-28274.

这个子项目是许多利用资源的研究子项目之一 由NIH/NCRR资助的中心拨款提供。子项目的主要支持 而子项目的主要调查员可能是由其他来源提供的， 包括其它NIH来源。 列出的子项目总成本可能 代表子项目使用的中心基础设施的估计数量， 而不是由NCRR赠款提供给子项目或子项目工作人员的直接资金。 α-突触核蛋白（aS）是一种高度保守的突触前蛋白，参与突触强度维持和多巴胺稳态。它还参与在几个控制点调节细胞内多巴胺水平。 然而，aS淀粉样蛋白原纤维的积累被认为是帕金森病发展的标志。α-突触核蛋白中的三个单点突变，即A30 P、A53 T和E46 K（以及aS基因的三倍）与罕见的帕金森病（PD）家族形式有关。另一方面，绝大多数路易体相关疾病病例是散发的，涉及野生型的aS。正常功能S涉及蛋白质-膜相互作用，在该相互作用下，蛋白质经历从胞质溶胶中的无序结构到膜结合状态中的高度螺旋结构的转变。在几个已完成的子项目中，我们成功地应用脉冲偶极ESR来表征与SDS胶束和磷脂膜结合的野生型aS的行为[1，2]。 在我们对WT和PD连锁突变体A30 P、E46 K和A53的结构特性的详细研究中，我们表明，根据aS环境，aS的所有变体都具有在断裂和延伸螺旋构象之间切换的倾向[1-3]。然而，关于触发和控制这种蛋白质聚集的因素的信息不足。因此，我们进行了一项研究，其目标是了解与常见的膜模拟物（如SDS）的相互作用是否以及如何引发aS的聚集。到目前为止，我们已经研究了与SDS的单自旋标记的半胱氨酸突变体的aS的相互作用。[1]Borbat，P.; Ramlall，T. F.地; Freed，J.H.; Eliezer，D. J. Am.化学会，2006，128，10004-10005。[2]爱尔卡河作者：Georgieva，Trudy F.放大图片作者：Peter P. Freed，大卫Eliezer，J. Am. 2008，130，12856-12857中所述。[3]急诊室Georgieva，T.F.作者：J.H. Freed，D. Eliezer，J Biol Chem，285（2010）28261-28274.