ジャーナル: EMBO Rep / 年: 2022 タイトル: Gel-like inclusions of C-terminal fragments of TDP-43 sequester stalled proteasomes in neurons. 著者: Henrick Riemenschneider / Qiang Guo / Jakob Bader / Frédéric Frottin / Daniel Farny / Gernot Kleinberger / Christian Haass / Matthias Mann / F Ulrich Hartl / Wolfgang Baumeister / Mark S ...著者: Henrick Riemenschneider / Qiang Guo / Jakob Bader / Frédéric Frottin / Daniel Farny / Gernot Kleinberger / Christian Haass / Matthias Mann / F Ulrich Hartl / Wolfgang Baumeister / Mark S Hipp / Felix Meissner / Rubén Fernández-Busnadiego / Dieter Edbauer / 要旨: Aggregation of the multifunctional RNA-binding protein TDP-43 defines large subgroups of amyotrophic lateral sclerosis and frontotemporal dementia and correlates with neurodegeneration in both ...Aggregation of the multifunctional RNA-binding protein TDP-43 defines large subgroups of amyotrophic lateral sclerosis and frontotemporal dementia and correlates with neurodegeneration in both diseases. In disease, characteristic C-terminal fragments of ~25 kDa ("TDP-25") accumulate in cytoplasmic inclusions. Here, we analyze gain-of-function mechanisms of TDP-25 combining cryo-electron tomography, proteomics, and functional assays. In neurons, cytoplasmic TDP-25 inclusions are amorphous, and photobleaching experiments reveal gel-like biophysical properties that are less dynamic than nuclear TDP-43. Compared with full-length TDP-43, the TDP-25 interactome is depleted of low-complexity domain proteins. TDP-25 inclusions are enriched in 26S proteasomes adopting exclusively substrate-processing conformations, suggesting that inclusions sequester proteasomes, which are largely stalled and no longer undergo the cyclic conformational changes required for proteolytic activity. Reporter assays confirm that TDP-25 impairs proteostasis, and this inhibitory function is enhanced by ALS-causing TDP-43 mutations. These findings support a patho-physiological relevance of proteasome dysfunction in ALS/FTD.
A: 10982.4 Å / B: 10982.4 Å / C: 985.6 Å α=β=γ: 90.0 °
CCP4マップ ヘッダ情報:
mode
Image stored as Reals
Å/pix. X/Y/Z
14.08
14.08
14.08
M x/y/z
780
780
70
origin x/y/z
0.000
0.000
0.000
length x/y/z
10982.400
10982.400
985.600
α/β/γ
90.000
90.000
90.000
start NX/NY/NZ
0
0
0
NX/NY/NZ
480
480
480
MAP C/R/S
1
2
3
start NC/NR/NS
0
0
4
NC/NR/NS
780
780
70
D min/max/mean
-94538203136.000
27483766784.000
99011656.000
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添付データ
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試料の構成要素
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全体 : rat primary neuron culture with TDP-25 inclusion
全体
名称: rat primary neuron culture with TDP-25 inclusion
要素
細胞: rat primary neuron culture with TDP-25 inclusion
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超分子 #1: rat primary neuron culture with TDP-25 inclusion
超分子
名称: rat primary neuron culture with TDP-25 inclusion / タイプ: cell / ID: 1 / 親要素: 0
由来(天然)
生物種: Rattus norvegicus (ドブネズミ)
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
電子線トモグラフィー法
試料の集合状態
cell
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試料調製
緩衝液
pH: 7
グリッド
材質: GOLD
凍結
凍結剤: ETHANE-PROPANE
切片作成
集束イオンビーム - 装置: OTHER / 集束イオンビーム - イオン: OTHER / 集束イオンビーム - 電圧: 30 kV / 集束イオンビーム - 電流: 1 nA / 集束イオンビーム - 時間: 1 sec. / 集束イオンビーム - 温度: 100 K / 集束イオンビーム - Initial thickness: 1000 nm / 集束イオンビーム - 最終 厚さ: 200 nm 集束イオンビーム - 詳細: The value given for _emd_sectioning_focused_ion_beam.instrument is quanta. This is not in a list of allowed values {'OTHER', 'DB235'} so OTHER is written into the XML file.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: GATAN K2 SUMMIT (4k x 4k) 平均電子線量: 2.5 e/Å2