National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
1R01GM071940
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
1R01AI094386
米国
引用
ジャーナル: Nat Commun / 年: 2018 タイトル: Cryo-EM of full-length α-synuclein reveals fibril polymorphs with a common structural kernel. 著者: Binsen Li / Peng Ge / Kevin A Murray / Phorum Sheth / Meng Zhang / Gayatri Nair / Michael R Sawaya / Woo Shik Shin / David R Boyer / Shulin Ye / David S Eisenberg / Z Hong Zhou / Lin Jiang / 要旨: α-Synuclein (aSyn) fibrillar polymorphs have distinct in vitro and in vivo seeding activities, contributing differently to synucleinopathies. Despite numerous prior attempts, how polymorphic aSyn ...α-Synuclein (aSyn) fibrillar polymorphs have distinct in vitro and in vivo seeding activities, contributing differently to synucleinopathies. Despite numerous prior attempts, how polymorphic aSyn fibrils differ in atomic structure remains elusive. Here, we present fibril polymorphs from the full-length recombinant human aSyn and their seeding capacity and cytotoxicity in vitro. By cryo-electron microscopy helical reconstruction, we determine the structures of the two predominant species, a rod and a twister, both at 3.7 Å resolution. Our atomic models reveal that both polymorphs share a kernel structure of a bent β-arch, but differ in their inter-protofilament interfaces. Thus, different packing of the same kernel structure gives rise to distinct fibril polymorphs. Analyses of disease-related familial mutations suggest their potential contribution to the pathogenesis of synucleinopathies by altering population distribution of the fibril polymorphs. Drug design targeting amyloid fibrils in neurodegenerative diseases should consider the formation and distribution of concurrent fibril polymorphs.
名称: Alpha-synuclein fibril - rod polymorph / タイプ: COMPLEX / Entity ID: all / 由来: RECOMBINANT
分子量
単位: MEGADALTONS / 実験値: NO
由来(天然)
生物種: Homo sapiens (ヒト)
由来(組換発現)
生物種: Escherichia coli (大腸菌) / 株: BL21-DE3 Gold
緩衝液
pH: 3
緩衝液成分
濃度: 15 mM / 名称: tetrabutylphosphonium bromide / 式: C16H36BrP
試料
包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES
試料支持
詳細: Quantifoil grid was treated with 1,2-Dichloroethane for one week, coated with additional carbon, and baken under 120kV in Camera chamber for 3 days グリッドの材料: COPPER / グリッドのサイズ: 200 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3
急速凍結
装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 295 K / 詳細: blot force: 1 blot time: 4s