ジャーナル: Nat Struct Mol Biol / 年: 2020 タイトル: Cryo-EM structure of an amyloid fibril formed by full-length human prion protein. 著者: Li-Qiang Wang / Kun Zhao / Han-Ye Yuan / Qiang Wang / Zeyuan Guan / Jing Tao / Xiang-Ning Li / Yunpeng Sun / Chuan-Wei Yi / Jie Chen / Dan Li / Delin Zhang / Ping Yin / Cong Liu / Yi Liang / 要旨: Prion diseases are caused by the misfolding of prion protein (PrP). Misfolded PrP forms protease-resistant aggregates in vivo (PrP) that are able to template the conversion of the native form of the ...Prion diseases are caused by the misfolding of prion protein (PrP). Misfolded PrP forms protease-resistant aggregates in vivo (PrP) that are able to template the conversion of the native form of the protein (PrP), a property shared by in vitro-produced PrP fibrils. Here we produced amyloid fibrils in vitro from recombinant, full-length human PrP (residues 23-231) and determined their structure using cryo-EM, building a model for the fibril core comprising residues 170-229. The PrP fibril consists of two protofibrils intertwined in a left-handed helix. Lys194 and Glu196 from opposing subunits form salt bridges, creating a hydrophilic cavity at the interface of the two protofibrils. By comparison with the structure of PrP, we propose that two α-helices in the C-terminal domain of PrP are converted into β-strands stabilized by a disulfide bond in the PrP fibril. Our data suggest that different PrP mutations may play distinct roles in modulating the conformational conversion.
A: Major prion protein B: Major prion protein C: Major prion protein D: Major prion protein E: Major prion protein F: Major prion protein G: Major prion protein H: Major prion protein I: Major prion protein J: Major prion protein
Regarding the conflict, the Met residue is a part of the initiation codon of human prion protein ...Regarding the conflict, the Met residue is a part of the initiation codon of human prion protein (PrP) in prokaryotic expression system. (see SEQADV)
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実験情報
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実験
実験
手法: 電子顕微鏡法
EM実験
試料の集合状態: HELICAL ARRAY / 3次元再構成法: らせん対称体再構成法
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試料調製
構成要素
名称: human prion protein amyloid fibril / タイプ: ORGANELLE OR CELLULAR COMPONENT / Entity ID: all / 由来: RECOMBINANT