ジャーナル: bioRxiv / 年: 2026 タイトル: Cathepsin-dependent amyloid formation drives mechanical rupture of lysosomal membranes. 著者: Delong Li / Wenxin Zhang / Michaela Medina / Jan F M Stuke / Andre Schwarz / Jonas Brill / Johann Brenner / Felix Kraus / Simon Ohlerich / Javier Lizarrondo / Jeremy Pflaum / Julia H Grass / ...著者: Delong Li / Wenxin Zhang / Michaela Medina / Jan F M Stuke / Andre Schwarz / Jonas Brill / Johann Brenner / Felix Kraus / Simon Ohlerich / Javier Lizarrondo / Jeremy Pflaum / Julia H Grass / Lena-Marie Soltow / Dietmar Hammerschmid / Natalie Weber / Sonja Welsch / Julian D Langer / Maike Windbergs / J Wade Harper / Erin Schuman / Gerhard Hummer / Danielle A Grotjahn / Florian Wilfling / 要旨: Lysosomal membrane integrity is essential for cellular homeostasis, and its failure drives lysosomal storage disorders (LSD) and neurodegeneration. The dipeptide L-leucyl-L-leucine methyl ester ...Lysosomal membrane integrity is essential for cellular homeostasis, and its failure drives lysosomal storage disorders (LSD) and neurodegeneration. The dipeptide L-leucyl-L-leucine methyl ester (LLOMe) is widely used to model lysosomal damage, yet its mechanism remains poorly understood. The prevailing view holds that LLOMe polymerizes into membrane-permeabilizing peptide chains within the lysosomal lumen. Using cryo-electron tomography in cultured cells and primary neurons, we visualized the structural basis of LLOMe-induced lysosomal damage. We reveal that LLOMe forms amyloid structures within lysosomes that directly interact with and rupture the limiting membrane through mechanical stress. reconstitution confirms this amyloid-mediated mechanism. These findings establish a structural paradigm for lysosomal membrane disruption and provide insights into how disease-relevant protein aggregates, implicated in neurodegeneration and LSD, may compromise lysosomal integrity.
A: 8895.488 Å / B: 12533.761 Å / C: 4787.2 Å α=β=γ: 90.0 °
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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 : HeLa TMEM192-3xHA cell
全体
名称: HeLa TMEM192-3xHA cell
要素
細胞: HeLa TMEM192-3xHA cell
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超分子 #1: HeLa TMEM192-3xHA cell
超分子
名称: HeLa TMEM192-3xHA cell / タイプ: cell / ID: 1 / 親要素: 0 詳細: pre-treated with E64d (AdooQ BioScience, A13259-25) with 20uM for 30min, then treated with LLOMe (Cayman Chemicals, 16008) at 0.5mM for 60min.
凍結剤: ETHANE / チャンバー内湿度: 70 % / チャンバー内温度: 310 K / 装置: LEICA EM GP
詳細
pre-treated with E64d (AdooQ BioScience, A13259-25) with 20uM for 30min, then treated with LLOMe (Cayman Chemicals, 16008) at 0.5mM for 60min.
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 / 集束イオンビーム - 電流: 0.5 / 集束イオンビーム - 時間: 120 / 集束イオンビーム - 温度: 80 K / 集束イオンビーム - Initial thickness: 1000 / 集束イオンビーム - 最終 厚さ: 130 集束イオンビーム - 詳細: using AutoTEM. The value given for _em_focused_ion_beam.instrument is Aquilos 2 FIB/SEM. This is not in a list of allowed values {'DB235', 'OTHER'} so OTHER is ...集束イオンビーム - 詳細: using AutoTEM. The value given for _em_focused_ion_beam.instrument is Aquilos 2 FIB/SEM. This is not in a list of allowed values {'DB235', 'OTHER'} so OTHER is written into the XML file.