National Institutes of Health/National Institute on Aging (NIH/NIA)
AG054022
米国
National Institutes of Health/National Institute on Aging (NIH/NIA)
AG061847
米国
Department of Energy (DOE, United States)
DE-FC02-02ER63421
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2019 タイトル: Structures of fibrils formed by α-synuclein hereditary disease mutant H50Q reveal new polymorphs. 著者: David R Boyer / Binsen Li / Chuanqi Sun / Weijia Fan / Michael R Sawaya / Lin Jiang / David S Eisenberg / 要旨: Deposits of amyloid fibrils of α-synuclein are the histological hallmarks of Parkinson's disease, dementia with Lewy bodies and multiple system atrophy, with hereditary mutations in α-synuclein ...Deposits of amyloid fibrils of α-synuclein are the histological hallmarks of Parkinson's disease, dementia with Lewy bodies and multiple system atrophy, with hereditary mutations in α-synuclein linked to the first two of these conditions. Seeing the changes to the structures of amyloid fibrils bearing these mutations may help to understand these diseases. To this end, we determined the cryo-EM structures of α-synuclein fibrils containing the H50Q hereditary mutation. We find that the H50Q mutation results in two previously unobserved polymorphs of α-synuclein: narrow and wide fibrils, formed from either one or two protofilaments, respectively. These structures recapitulate conserved features of the wild-type fold but reveal new structural elements, including a previously unobserved hydrogen-bond network and surprising new protofilament arrangements. The structures of the H50Q polymorphs help to rationalize the faster aggregation kinetics, higher seeding capacity in biosensor cells and greater cytotoxicity that we observe for H50Q compared to wild-type α-synuclein.