+データを開く
-基本情報
登録情報 | データベース: EMDB / ID: EMD-3864 | |||||||||||||||
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タイトル | Negative stain electron microscopy reconstruction of a cellulose secretion (Bcs) macrocomplex from E. coli | |||||||||||||||
マップデータ | Bcs macrocomplex encompassing most inner-membrane and cytosolic components of the E. coli cellulose secretion system. Negative-stain EM | |||||||||||||||
試料 |
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生物種 | Escherichia coli (大腸菌) | |||||||||||||||
手法 | 単粒子再構成法 / ネガティブ染色法 / 解像度: 16.7 Å | |||||||||||||||
データ登録者 | Krasteva PV / Fronzes R | |||||||||||||||
資金援助 | フランス, 4件
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引用 | ジャーナル: Nat Commun / 年: 2017 タイトル: Insights into the structure and assembly of a bacterial cellulose secretion system. 著者: Petya Violinova Krasteva / Joaquin Bernal-Bayard / Laetitia Travier / Fernando Ariel Martin / Pierre-Alexandre Kaminski / Gouzel Karimova / Rémi Fronzes / Jean-Marc Ghigo / 要旨: Secreted exopolysaccharides present important determinants for bacterial biofilm formation, survival, and virulence. Cellulose secretion typically requires the concerted action of a c-di-GMP- ...Secreted exopolysaccharides present important determinants for bacterial biofilm formation, survival, and virulence. Cellulose secretion typically requires the concerted action of a c-di-GMP-responsive inner membrane synthase (BcsA), an accessory membrane-anchored protein (BcsB), and several additional Bcs components. Although the BcsAB catalytic duo has been studied in great detail, its interplay with co-expressed subunits remains enigmatic. Here we show that E. coli Bcs proteins partake in a complex protein interaction network. Electron microscopy reveals a stable, megadalton-sized macromolecular assembly, which encompasses most of the inner membrane and cytosolic Bcs components and features a previously unobserved asymmetric architecture. Heterologous reconstitution and mutational analyses point toward a structure-function model, where accessory proteins regulate secretion by affecting both the assembly and stability of the system. Altogether, these results lay the foundation for more comprehensive models of synthase-dependent exopolysaccharide secretion in biofilms and add a sophisticated secretory nanomachine to the diverse bacterial arsenal for virulence and adaptation. | |||||||||||||||
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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構造ビューア | EMマップ: SurfViewMolmilJmol/JSmol |
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_3864.map.gz | 5 MB | EMDBマップデータ形式 | |
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ヘッダ (付随情報) | emd-3864-v30.xml emd-3864.xml | 13.6 KB 13.6 KB | 表示 表示 | EMDBヘッダ |
FSC (解像度算出) | emd_3864_fsc.xml | 7.3 KB | 表示 | FSCデータファイル |
画像 | emd_3864.png | 48.8 KB | ||
アーカイブディレクトリ | http://ftp.pdbj.org/pub/emdb/structures/EMD-3864 ftp://ftp.pdbj.org/pub/emdb/structures/EMD-3864 | 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_3864.map.gz / 形式: CCP4 / 大きさ: 35.3 MB / タイプ: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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注釈 | Bcs macrocomplex encompassing most inner-membrane and cytosolic components of the E. coli cellulose secretion system. Negative-stain EM | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
ボクセルのサイズ | X=Y=Z: 1.9 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 : Protein macrocomplex encompassing most cytosolic and inner-membra...
全体 | 名称: Protein macrocomplex encompassing most cytosolic and inner-membrane components of the E. coli system for cellulose secretion |
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要素 |
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-超分子 #1: Protein macrocomplex encompassing most cytosolic and inner-membra...
超分子 | 名称: Protein macrocomplex encompassing most cytosolic and inner-membrane components of the E. coli system for cellulose secretion タイプ: complex / ID: 1 / 親要素: 0 詳細: Protein macrocomplex encompassing cytosolic (BcsRQEF) and inner-membrane (BcsAB) components. Isolated from purified and detergent-solubilised E. coli 1094 membranes using FLAG-tagged BcsA as ...詳細: Protein macrocomplex encompassing cytosolic (BcsRQEF) and inner-membrane (BcsAB) components. Isolated from purified and detergent-solubilised E. coli 1094 membranes using FLAG-tagged BcsA as bait. Stabilised by gentle glutaraldehyde cross-linking over a density gradient (GraFix). |
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由来(天然) | 生物種: Escherichia coli (大腸菌) / 株: 1094 |
組換発現 | 生物種: Escherichia coli (大腸菌) / 組換株: 1094 2K7 BcsA-HA-FLAG / 組換プラスミド: Chromosome-driven expression |
分子量 | 理論値: 1.4 MDa |
-実験情報
-構造解析
手法 | ネガティブ染色法 |
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解析 | 単粒子再構成法 |
試料の集合状態 | particle |
-試料調製
濃度 | 0.1 mg/mL |
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緩衝液 | pH: 8 詳細: 20 mM HEPES pH 8.0 120 mM NaCl, 10%-40% glycerol, 5 mM MgCl2 10 uM AppCp 2 uM cyclic c-di-GMP cOmplete protease inhibitors |
染色 | タイプ: NEGATIVE / 材質: Uranyl Acetate 詳細: 5 micrometers of sample were spotted on glow-discharged carbon-coated copper grids. After 1 minutes the liquid was blotted off and the sample was stained by quick passage through 3 drops of ...詳細: 5 micrometers of sample were spotted on glow-discharged carbon-coated copper grids. After 1 minutes the liquid was blotted off and the sample was stained by quick passage through 3 drops of 2% uranyl acetate. The sample was left for 20-30 seconds on the last drop of stain, after which the liquid was blotted off and the sample was allowed to air-dry |
グリッド | 材質: COPPER / メッシュ: 400 / 支持フィルム - 材質: CARBON / 支持フィルム - トポロジー: CONTINUOUS / 前処理 - タイプ: GLOW DISCHARGE / 前処理 - 雰囲気: AIR / 詳細: 7mA, 10 microns |
詳細 | Sample was purified from pelleted and solubilised membrane fractions of the E. coli 1094 2K7 BcsA-HA-FLAG strain using anti-FLAG affinity gel, 3xFLAG peptide elution and glycerol gradient purification coupled with gentle glutaraldehyde cross-linking (GraFix). Sample was monodisperse and subjected to thin-layer uranyl acetate staining. |
-電子顕微鏡法
顕微鏡 | FEI TECNAI F20 |
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電子線 | 加速電圧: 200 kV / 電子線源: FIELD EMISSION GUN |
電子光学系 | 最小 デフォーカス(補正後): 0.5 µm / 照射モード: FLOOD BEAM / 撮影モード: BRIGHT FIELDBright-field microscopy / 最大 デフォーカス(公称値): 4.0 µm / 倍率(公称値): 50000 |
試料ステージ | 試料ホルダーモデル: OTHER / ホルダー冷却材: NITROGEN |
撮影 | フィルム・検出器のモデル: FEI FALCON II (4k x 4k) 撮影したグリッド数: 2 / 平均電子線量: 12.0 e/Å2 |
実験機器 | モデル: Tecnai F20 / 画像提供: FEI Company |