- EMDB-51431: Structure of 6mer pore intermediate of Sticholysin II (StnII) tox... -
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基本情報
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データベース: EMDB / ID: EMD-51431
タイトル
Structure of 6mer pore intermediate of Sticholysin II (StnII) toxin in lipid nanodiscs
マップデータ
Structure of the 6-mer pore-forming intermediate in lipid nanodiscs of the Sticholysin II (DELTA-stichotoxin-She4b) toxin from the sea anemone Stichodactyla helianthus.
試料
複合体: Sticholysin II or DELTA-stichotoxin-She4b (StnII) in lipid nanodiscs
タンパク質・ペプチド: DELTA-stichotoxin-She4b
リガンド: sphingomyelin
キーワード
membrane protein / nanodisc / toxin / actinoporin
機能・相同性
機能・相同性情報
nematocyst / pore complex assembly / cytolysis in another organism / other organism cell membrane / pore complex / monoatomic cation transport / channel activity / toxin activity / extracellular region / identical protein binding 類似検索 - 分子機能
Spanish Ministry of Science, Innovation, and Universities
PID2020-117752RB-I00
スペイン
Spanish Ministry of Science, Innovation, and Universities
TED2021-132748B-I00
スペイン
引用
ジャーナル: Sci Adv / 年: 2025 タイトル: Elucidating the structure and assembly mechanism of actinoporin pores in complex membrane environments. 著者: Rocío Arranz / César Santiago / Simonas Masiulis / Esperanza Rivera-de-Torre / Juan Palacios-Ortega / Diego Carlero / Diego Heras-Márquez / José G Gavilanes / Ernesto Arias-Palomo / ...著者: Rocío Arranz / César Santiago / Simonas Masiulis / Esperanza Rivera-de-Torre / Juan Palacios-Ortega / Diego Carlero / Diego Heras-Márquez / José G Gavilanes / Ernesto Arias-Palomo / Álvaro Martínez-Del-Pozo / Sara García-Linares / Jaime Martín-Benito / 要旨: Pore-forming proteins exemplify the transformative potential of biological molecules. Produced as soluble monomers, they assemble into multimeric membrane-inserted complexes in response to specific ...Pore-forming proteins exemplify the transformative potential of biological molecules. Produced as soluble monomers, they assemble into multimeric membrane-inserted complexes in response to specific membrane environments. Actinoporins, a class of pore-forming proteins from sea anemones, target membranes to kill cells. Here, we report cryogenic electron microscopy structures of two actinoporins, fragaceatoxin C and sticholysin II, reconstituted in lipid membranes. The structures reveal an ordered arrangement of dozens of lipid molecules that form an integral part of the pore architecture. We also captured distinct oligomeric intermediates, arc-shaped assemblies with monomers in transitional conformations, representing key snapshots along the pore formation pathway. These data provide direct structural evidence for a stepwise mechanism in which monomers sequentially bind the membrane and undergo conformational changes that drive pore assembly and membrane disruption. Our findings reveal how these proteins reshape membranes and offer mechanistic insights into their cytolytic activity. This work broadens our understanding of pore-forming proteins, which are gaining increasing relevance in diverse biotechnological applications.
ダウンロード / ファイル: emd_51431.map.gz / 形式: CCP4 / 大きさ: 22.2 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
注釈
Structure of the 6-mer pore-forming intermediate in lipid nanodiscs of the Sticholysin II (DELTA-stichotoxin-She4b) toxin from the sea anemone Stichodactyla helianthus.
Structure of the 6-mer pore-forming intermediate in lipid nanodiscs of the Sticholysin II (DELTA-stichotoxin-She4b) toxin from the sea anemone Stichodactyla helianthus. Half B.
Structure of the 6-mer pore-forming intermediate in lipid nanodiscs of the Sticholysin II (DELTA-stichotoxin-She4b) toxin from the sea anemone Stichodactyla helianthus. Half A.