ジャーナル: Nat Commun / 年: 2017 タイトル: Bri2 BRICHOS client specificity and chaperone activity are governed by assembly state. 著者: Gefei Chen / Axel Abelein / Harriet E Nilsson / Axel Leppert / Yuniesky Andrade-Talavera / Simone Tambaro / Lovisa Hemmingsson / Firoz Roshan / Michael Landreh / Henrik Biverstål / Philip J ...著者: Gefei Chen / Axel Abelein / Harriet E Nilsson / Axel Leppert / Yuniesky Andrade-Talavera / Simone Tambaro / Lovisa Hemmingsson / Firoz Roshan / Michael Landreh / Henrik Biverstål / Philip J B Koeck / Jenny Presto / Hans Hebert / André Fisahn / Jan Johansson / 要旨: Protein misfolding and aggregation is increasingly being recognized as a cause of disease. In Alzheimer's disease the amyloid-β peptide (Aβ) misfolds into neurotoxic oligomers and assembles into ...Protein misfolding and aggregation is increasingly being recognized as a cause of disease. In Alzheimer's disease the amyloid-β peptide (Aβ) misfolds into neurotoxic oligomers and assembles into amyloid fibrils. The Bri2 protein associated with Familial British and Danish dementias contains a BRICHOS domain, which reduces Aβ fibrillization as well as neurotoxicity in vitro and in a Drosophila model, but also rescues proteins from irreversible non-fibrillar aggregation. How these different activities are mediated is not known. Here we show that Bri2 BRICHOS monomers potently prevent neuronal network toxicity of Aβ, while dimers strongly suppress Aβ fibril formation. The dimers assemble into high-molecular-weight oligomers with an apparent two-fold symmetry, which are efficient inhibitors of non-fibrillar protein aggregation. These results indicate that Bri2 BRICHOS affects qualitatively different aspects of protein misfolding and toxicity via different quaternary structures, suggesting a means to generate molecular chaperone diversity.
Purified fraction with protein was immediately stored on ice followed by grid preparation.
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電子顕微鏡法
顕微鏡
JEOL 2100F
詳細
per frame =1.44 e/A2
撮影
フィルム・検出器のモデル: DIRECT ELECTRON DE-20 (5k x 3k) 検出モード: INTEGRATING / デジタル化 - サイズ - 横: 5120 pixel / デジタル化 - サイズ - 縦: 3840 pixel / 実像数: 24 / 平均露光時間: 2.0 sec. / 平均電子線量: 57.5 e/Å2 詳細: Negative stain images were collected in movie-mode at 20 frames per second. For each exposure, the comprised frames were drift corrected using the DE_process_frames-2.7.1.py script