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万見- EMDB-13248: cryoFIB milling/cryoET of amoeba infected with Legionella pneumophila -
+データを開く
-基本情報
登録情報 | データベース: EMDB / ID: EMD-13248 | |||||||||
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タイトル | cryoFIB milling/cryoET of amoeba infected with Legionella pneumophila | |||||||||
マップデータ | Dictyostelium discoideum infected with Legionella pneumophila JR32 | |||||||||
試料 |
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生物種 | Legionella pneumophila (バクテリア) | |||||||||
手法 | 電子線トモグラフィー法 / クライオ電子顕微鏡法 | |||||||||
データ登録者 | Boeck D / Huesler D | |||||||||
資金援助 | スイス, 2件
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引用 | ジャーナル: mBio / 年: 2021 タイトル: The Polar Icm/Dot T4SS Establishes Distinct Contact Sites with the Pathogen Vacuole Membrane. 著者: Désirée Böck / Dario Hüsler / Bernhard Steiner / João M Medeiros / Amanda Welin / Katarzyna A Radomska / Wolf-Dietrich Hardt / Martin Pilhofer / Hubert Hilbi / 要旨: Legionella pneumophila, the causative agent of Legionnaires' disease, is a facultative intracellular pathogen that survives inside phagocytic host cells by establishing a protected replication niche, ...Legionella pneumophila, the causative agent of Legionnaires' disease, is a facultative intracellular pathogen that survives inside phagocytic host cells by establishing a protected replication niche, termed the "-containing vacuole" (LCV). To form an LCV and subvert pivotal host pathways, L. pneumophila employs a type IV secretion system (T4SS), which translocates more than 300 different effector proteins into the host cell. The L. pneumophila T4SS complex has been shown to span the bacterial cell envelope at the bacterial poles. However, the interactions between the T4SS and the LCV membrane are not understood. Using cryo-focused ion beam milling, cryo-electron tomography, and confocal laser scanning fluorescence microscopy, we show that up to half of the intravacuolar L. pneumophila bacteria tether their cell pole to the LCV membrane. Tethering coincides with the presence and function of T4SSs and likely promotes the establishment of distinct contact sites between T4SSs and the LCV membrane. Contact sites are characterized by indentations in the limiting LCV membrane and localize juxtaposed to T4SS machineries. The data are in agreement with the notion that effector translocation occurs by close membrane contact rather than by an extended pilus. Our findings provide novel insights into the interactions of the L. pneumophila T4SS with the LCV membrane . Legionnaires' disease is a life-threatening pneumonia, which is characterized by high fever, coughing, shortness of breath, muscle pain, and headache. The disease is caused by the amoeba-resistant bacterium L. pneumophila found in various soil and aquatic environments and is transmitted to humans via the inhalation of small bacteria-containing droplets. An essential virulence factor of L. pneumophila is a so-called "type IV secretion system" (T4SS), which, by injecting a plethora of "effector proteins" into the host cell, determines pathogen-host interactions and the formation of a distinct intracellular compartment, the "-containing vacuole" (LCV). It is unknown how the T4SS makes contact to the LCV membrane to deliver the effectors. In this study, we identify indentations in the host cell membrane in close proximity to functional T4SSs localizing at the bacterial poles. Our work reveals first insights into the architecture of -LCV contact sites. | |||||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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添付画像 |
-ダウンロードとリンク
-EMDBアーカイブ
マップデータ | emd_13248.map.gz | 156.8 MB | EMDBマップデータ形式 | |
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ヘッダ (付随情報) | emd-13248-v30.xml emd-13248.xml | 9.2 KB 9.2 KB | 表示 表示 | EMDBヘッダ |
画像 | emd_13248.png | 170.1 KB | ||
アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-13248 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-13248 | HTTPS FTP |
-検証レポート
文書・要旨 | emd_13248_validation.pdf.gz | 309.6 KB | 表示 | EMDB検証レポート |
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文書・詳細版 | emd_13248_full_validation.pdf.gz | 309.2 KB | 表示 | |
XML形式データ | emd_13248_validation.xml.gz | 3.1 KB | 表示 | |
CIF形式データ | emd_13248_validation.cif.gz | 3.6 KB | 表示 | |
アーカイブディレクトリ | https://ftp.pdbj.org/pub/emdb/validation_reports/EMD-13248 ftp://ftp.pdbj.org/pub/emdb/validation_reports/EMD-13248 | HTTPS FTP |
-関連構造データ
-リンク
EMDBのページ | EMDB (EBI/PDBe) / EMDataResource |
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-マップ
ファイル | ダウンロード / ファイル: emd_13248.map.gz / 形式: CCP4 / 大きさ: 220.9 MB / タイプ: IMAGE STORED AS SIGNED BYTE | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | Dictyostelium discoideum infected with Legionella pneumophila JR32 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 17.14 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
密度 |
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対称性 | 空間群: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
詳細 | EMDB XML:
CCP4マップ ヘッダ情報:
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-添付データ
-試料の構成要素
-全体 : Acanthamoeba castellanii infected with Legionella pneumophila JR32
全体 | 名称: Acanthamoeba castellanii infected with Legionella pneumophila JR32 |
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要素 |
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-超分子 #1: Acanthamoeba castellanii infected with Legionella pneumophila JR32
超分子 | 名称: Acanthamoeba castellanii infected with Legionella pneumophila JR32 タイプ: cell / ID: 1 / 親要素: 0 詳細: Legionella-containing vacuole (LCV) at 2 hpi in the amoeba host A. castellanii |
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由来(天然) | 生物種: Legionella pneumophila (バクテリア) / 株: JR32 |
-実験情報
-構造解析
手法 | クライオ電子顕微鏡法 |
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解析 | 電子線トモグラフィー法 |
試料の集合状態 | cell |
-試料調製
緩衝液 | pH: 7 |
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凍結 | 凍結剤: ETHANE-PROPANE / チャンバー内湿度: 90 % / チャンバー内温度: 280 K / 装置: FEI VITROBOT MARK IV |
詳細 | cryoFIB milling of plunge-frozen infected amoeba and subsequent cryoET of the resulting lamellae |
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: 0.025 nA / 集束イオンビーム - 時間: 3600 sec. / 集束イオンビーム - 温度: 120 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 FEI Helios NanoLab600i. This is not in a list of allowed values {'OTHER', 'DB235'} so OTHER is ...集束イオンビーム - 詳細: The value given for _emd_sectioning_focused_ion_beam.instrument is FEI Helios NanoLab600i. This is not in a list of allowed values {'OTHER', 'DB235'} so OTHER is written into the XML file. |
-電子顕微鏡法
顕微鏡 | FEI TITAN KRIOS |
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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: 1.25 e/Å2 |
電子線 | 加速電圧: 300 kV / 電子線源: FIELD EMISSION GUN |
電子光学系 | 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELD |
実験機器 | モデル: Titan Krios / 画像提供: FEI Company |
-画像解析
最終 再構成 | 使用した粒子像数: 61 |
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