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データを開く
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基本情報
| 登録情報 | データベース: PDB / ID: 9i3o | |||||||||||||||||||||||||||||||||
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| タイトル | Csu pilus rod type 2 stack | |||||||||||||||||||||||||||||||||
要素 | CsuA/B | |||||||||||||||||||||||||||||||||
キーワード | CELL ADHESION / pili / fimbriae / Acinetobacter baumannii pili / chaperone-usher pathway / archaic chaperone-usher pili / biofilm / 3D biofilm / adhesion / pathogenesis / pilus antiparallel binding junction | |||||||||||||||||||||||||||||||||
| 機能・相同性 | : / Spore coat protein U / Spore Coat Protein U domain / Spore Coat Protein U domain / Spore coat protein U/FanG domain-containing protein 機能・相同性情報 | |||||||||||||||||||||||||||||||||
| 生物種 | Acinetobacter baumannii (バクテリア) | |||||||||||||||||||||||||||||||||
| 手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 4.7 Å | |||||||||||||||||||||||||||||||||
データ登録者 | Malmi, H. / Pakharukova, N. / Zavialov, A.V. | |||||||||||||||||||||||||||||||||
| 資金援助 | フィンランド, 3件
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引用 | ジャーナル: Nat Commun / 年: 2026タイトル: Antiparallel stacking of Csu pili drives Acinetobacter baumannii 3D biofilm assembly. 著者: Henri Malmi / Natalia Pakharukova / Bindusmita Paul / Minna Tuittila / Irfan Ahmad / Stefan David Knight / Bernt Eric Uhlin / Debnath Ghosal / Anton V Zavialov / ![]() 要旨: Many Gram-negative nosocomial pathogens rely on adhesive filaments, known as archaic chaperone-usher pili, to establish stress- and drug-resistant, multi-layered biofilms. Here, we uncover the ...Many Gram-negative nosocomial pathogens rely on adhesive filaments, known as archaic chaperone-usher pili, to establish stress- and drug-resistant, multi-layered biofilms. Here, we uncover the mechanism by which these pili build three-dimensional (3D) biofilm architectures. In situ analyses of Acinetobacter baumannii biofilms using electron microscopy (EM) reveal an extensive network of ultrathin, flat stacks of archaic Csu pili interconnecting bacterial cells in 3D space. Cryo-EM structures of a single native pilus, pilus pairs, and two types of multi-pilus stacks show that the pili pack into antiparallel sheets, with their rods connected laterally by junctions at their zigzag corners. This antiparallel arrangement ensures that contacts form primarily between pili from interacting cells rather than pili from the same cell. With a remarkably short helical repeat, archaic chaperone-usher pili spontaneously establish a high density of junctions that determines the biofilm's 3D architecture. Our findings may help develop new therapies against multidrug-resistant bacterial infections by targeting pilus-pilus interactions. | |||||||||||||||||||||||||||||||||
| 履歴 |
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構造の表示
| 構造ビューア | 分子: Molmil Jmol/JSmol |
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ダウンロードとリンク
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ダウンロード
| PDBx/mmCIF形式 | 9i3o.cif.gz | 3 MB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9i3o.ent.gz | 表示 | PDB形式 | |
| PDBx/mmJSON形式 | 9i3o.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
| その他 | その他のダウンロード |
-検証レポート
| アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/i3/9i3o ftp://data.pdbj.org/pub/pdb/validation_reports/i3/9i3o | HTTPS FTP |
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-関連構造データ
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リンク
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集合体
| 登録構造単位 | ![]()
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要素
| #1: タンパク質 | 分子量: 16069.642 Da / 分子数: 72 / 由来タイプ: 組換発現 詳細: Csu pilus rods are homopolymers of subunit CsuA/B. Structure depicts four Csu pilus rods forming type 2 stack architecture through antiparallel interactions. 由来: (組換発現) Acinetobacter baumannii (バクテリア)株: 19096 / 遺伝子: ATCC19606_12570 / プラスミド: pBAD-Csu / Cell (発現宿主): Planktonic bacteria / 発現宿主: ![]() Has protein modification | Y | |
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-実験情報
-実験
| 実験 | 手法: 電子顕微鏡法 |
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| EM実験 | 試料の集合状態: 2D ARRAY / 3次元再構成法: 単粒子再構成法 |
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試料調製
| 構成要素 | 名称: Csu pilus rod type 2 stack / タイプ: COMPLEX 詳細: Csu pilus rods are homopolymers of subunit CsuA/B. The sample contains Csu pilus rods self-assembled into type 1 and type 2 stack architectures through antiparallel interactions. The stacks ...詳細: Csu pilus rods are homopolymers of subunit CsuA/B. The sample contains Csu pilus rods self-assembled into type 1 and type 2 stack architectures through antiparallel interactions. The stacks accumulate slowly over time as a gel-like substance at the bottom of a sample tube containing purified Csu pili. Entity ID: all / 由来: RECOMBINANT | |||||||||||||||
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| 分子量 | 値: 16.05974 kDa/nm / 実験値: NO | |||||||||||||||
| 由来(天然) | 生物種: Acinetobacter baumannii (バクテリア) / 株: 19096 / 細胞内の位置: Outer membrane / Organelle: Outer membrane / 組織: Planktonic bacteria | |||||||||||||||
| 由来(組換発現) | 生物種: ![]() | |||||||||||||||
| 緩衝液 | pH: 7.4 詳細: Sample is a fraction taken from an ion exchange column elution gradient, so the NaCl concentration may vary. | |||||||||||||||
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| 試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES 詳細: Csu pilus rods are homopolymers of subunit CsuA/B. The sample contains Csu pilus rods self-assembled into type 1 and type 2 stack architectures through antiparallel interactions. The stacks ...詳細: Csu pilus rods are homopolymers of subunit CsuA/B. The sample contains Csu pilus rods self-assembled into type 1 and type 2 stack architectures through antiparallel interactions. The stacks accumulate slowly over time as a gel-like substance at the bottom of a sample tube containing purified Csu pili. | |||||||||||||||
| 試料支持 | グリッドの材料: COPPER / グリッドのサイズ: 300 divisions/in. / グリッドのタイプ: Quantifoil R1.2/1.3 | |||||||||||||||
| 急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 277.15 K |
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電子顕微鏡撮影
| 実験機器 | ![]() モデル: Titan Krios / 画像提供: FEI Company |
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| 顕微鏡 | モデル: TFS KRIOS |
| 電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM |
| 電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 105000 X / 最大 デフォーカス(公称値): 1600 nm / 最小 デフォーカス(公称値): 400 nm / Cs: 2.7 mm / C2レンズ絞り径: 50 µm |
| 試料ホルダ | 凍結剤: NITROGEN 試料ホルダーモデル: FEI TITAN KRIOS AUTOGRID HOLDER |
| 撮影 | 平均露光時間: 2.79 sec. / 電子線照射量: 59.848 e/Å2 フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 撮影したグリッド数: 1 / 実像数: 7941 詳細: Grid squares and holes were selected manually as the pilus stack were visible in the atlas. |
| 画像スキャン | 横: 5760 / 縦: 4092 |
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解析
| EMソフトウェア |
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| CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 粒子像の選択 | 選択した粒子像数: 30605819 詳細: Two different types of Csu pilus stack architectures were solved from the same particle set. Particle picking failed to distinguish between the two, so the initial number of particles is the ...詳細: Two different types of Csu pilus stack architectures were solved from the same particle set. Particle picking failed to distinguish between the two, so the initial number of particles is the same for both stack architectures. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 3次元再構成 | 解像度: 4.7 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 687088 詳細: Local Refinement allowed generating a single map without individual particles flipping and settling into pseudosymmetric orientations. 対称性のタイプ: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 原子モデル構築 | B value: 330.69 / プロトコル: RIGID BODY FIT / 空間: REAL 詳細: UCSF Chimera was used to first fit the subunits into the single native pilus rod map (PDB Accession ID: 9I37) and average their relative angles, and it was also used to adjust pixel spacing ...詳細: UCSF Chimera was used to first fit the subunits into the single native pilus rod map (PDB Accession ID: 9I37) and average their relative angles, and it was also used to adjust pixel spacing of all maps to match model dimensions. Coot was used to adjust side chain and loop positions. A pair of antiparallel pili with subunit angles adjusted to 3-turns-per-7-subunits symmetry was overlapped with a 2D class to adjust the binding junction angle. Finally, Phenix was used to fit the type 2 stack model into the map. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 原子モデル構築 | PDB-ID: 7ZL4 Accession code: 7ZL4 / Chain residue range: 24-178 詳細: The initial model consisted of a single pilus rod fragment of the same type. The initial model in turn is based on a crystal structure of CsuA/Bsc with PDB accession code 6FM5. Pdb chain residue range: 24-178 / Source name: PDB / タイプ: experimental model |
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万見について




Acinetobacter baumannii (バクテリア)
フィンランド, 3件
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PDBj

FIELD EMISSION GUN