+検索条件
-Structure paper
| タイトル | Cathepsin-dependent amyloid formation drives mechanical rupture of lysosomal membranes. |
|---|---|
| ジャーナル・号・ページ | bioRxiv, Year 2026 |
| 掲載日 | 2026年1月19日 |
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 / ![]() |
| PubMed 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. |
リンク | bioRxiv / PubMed:41648416 / PubMed Central |
| 手法 | EM (サブトモグラム平均) / EM (トモグラフィー) |
| 解像度 | 18.74 Å |
| 構造データ | ![]() EMDB-56238: In situ cryo-ET subtomogram averaged map of Flotillin complex ![]() EMDB-56295: In situ cryo-ET tomogram of a lysosomal structure in untreated HeLa TMEM192-3xHA cell. ![]() EMDB-56296: In situ cryo-ET tomogram of lysosome damaged by LLOMe (0.5mM, 60min) in HeLa TMEM192-3xHA cell. ![]() EMDB-56297: In situ cryo-ET of lysosome damaged by LLOMe (0.5mM, 60min) encapsulated in an autophagosome in HeLa TMEM192-3xHA cell. ![]() EMDB-56298: In situ cryo-ET tomogram of lysosomes in BAPTA AM pre-treated (50uM, 30min) and LLOMe (0.5mM, 60min) treated TMEM192-3xHA HeLa cell. ![]() EMDB-56300: In situ cryo-ET tomogram of lysosomes in LLOMe (0.5mM, 60min) treated TMEM192-3xHA HeLa cell. ![]() EMDB-56327: In situ cryo-ET tomogram of lysosomal structure in untreated rat hippocampal neurons ![]() EMDB-56329: In situ cryo-ET tomogram of lysosomes in E64d pre-treated (20uM, 30min) and LLOMe (0.5mM, 60min) treated TMEM192-3xHA HeLa cell. ![]() EMDB-56330: In situ cryo-ET tomogram of lysosomal structure in LLOMe-treated (0.5mM, 1h) rat hippocampal neuron. |
| 由来 |
|
ムービー
コントローラー
構造ビューア
万見文献について



著者

リンク








Homo sapiens (ヒト)
