Ministry of Education, Culture, Sports, Science and Technology (Japan)
JP24ama121005
日本
引用
ジャーナル: ACS Chem Neurosci / 年: 2025 タイトル: Microgravity-Assisted Exploration of the Conformational Space of Amyloid β Affected by Tottori-Type Familial Mutation D7N. 著者: Maho Yagi-Utsumi / Saeko Yanaka / Raymond N Burton-Smith / Chihong Song / Christian Ganser / Chiaki Yamazaki / Haruo Kasahara / Toru Shimazu / Takayuki Uchihashi / Kazuyoshi Murata / Koichi Kato / 要旨: The amyloid β (Aβ) Tottori variant (D7N) exhibits unique aggregation behaviors and altered fibril formation, posing challenges for structural characterization. To overcome this, the microgravity ...The amyloid β (Aβ) Tottori variant (D7N) exhibits unique aggregation behaviors and altered fibril formation, posing challenges for structural characterization. To overcome this, the microgravity environment on the International Space Station was employed to study Tottori-type Aβ40 fibril formation and structure. Under Earth gravity, Tottori-type Aβ40 primarily formed nonfibrillar aggregates, hindering detailed structural analysis. In contrast, microgravity significantly enhanced fibril formation and minimized amorphous aggregates. Cryo-electron microscopy revealed two structurally distinct fibril types, each comprising different protomer conformations. In both types, the N-terminal segment was disordered and nor resolved in the density maps. The D7N mutation disrupts the protection of the core by the N-terminal segment often observed in wild-type Aβ40 fibrils, enhancing the hydrophobicity-mediated aggregation propensity. However, microgravity suppressed kinetic traps and facilitated high-quality fibril formation suitable for structural studies that can explore the free energy landscape of Aβ fibril formation. These findings demonstrate the utility of microgravity for studying familial Aβ variants and potentially accelerate our understanding of Aβ aggregation mechanisms in Alzheimer's disease.
AL: Amyloid-beta protein 40 AM: Amyloid-beta protein 40 AN: Amyloid-beta protein 40 AO: Amyloid-beta protein 40 AP: Amyloid-beta protein 40 AQ: Amyloid-beta protein 40 AR: Amyloid-beta protein 40 AS: Amyloid-beta protein 40 AT: Amyloid-beta protein 40 AU: Amyloid-beta protein 40 AV: Amyloid-beta protein 40 AW: Amyloid-beta protein 40 AX: Amyloid-beta protein 40 AY: Amyloid-beta protein 40 AZ: Amyloid-beta protein 40 Aa: Amyloid-beta protein 40 Ab: Amyloid-beta protein 40 Ac: Amyloid-beta protein 40 Ad: Amyloid-beta protein 40 Ae: Amyloid-beta protein 40 Af: Amyloid-beta protein 40