+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 2v6l | ||||||
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タイトル | Molecular Model of a Type III Secretion System Needle | ||||||
要素 | MXIH | ||||||
キーワード | PROTEIN TRANSPORT / T3SS / VIRULENCE / TRANSPORT | ||||||
機能・相同性 | 機能・相同性情報 type III protein secretion system complex / protein secretion by the type III secretion system / cell surface / extracellular region / identical protein binding 類似検索 - 分子機能 | ||||||
生物種 | SHIGELLA FLEXNERI (フレクスナー赤痢菌) | ||||||
手法 | 電子顕微鏡法 / らせん対称体再構成法 / ネガティブ染色法 / 解像度: 16 Å | ||||||
Model type details | CA ATOMS ONLY, CHAIN A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, 1, 0 | ||||||
データ登録者 | Deane, J.E. / Roversi, P. / Cordes, F.S. / Johnson, S. / Kenjale, R. / Daniell, S. / Booy, F. / Picking, W.L. / Picking, W.D. / Blocker, A.J. / Lea, S.M. | ||||||
引用 | ジャーナル: Proc Natl Acad Sci U S A / 年: 2006 タイトル: Molecular model of a type III secretion system needle: Implications for host-cell sensing. 著者: Janet E Deane / Pietro Roversi / Frank S Cordes / Steven Johnson / Roma Kenjale / Sarah Daniell / Frank Booy / William D Picking / Wendy L Picking / Ariel J Blocker / Susan M Lea / 要旨: Type III secretion systems are essential virulence determinants for many Gram-negative bacterial pathogens. The type III secretion system consists of cytoplasmic, transmembrane, and extracellular ...Type III secretion systems are essential virulence determinants for many Gram-negative bacterial pathogens. The type III secretion system consists of cytoplasmic, transmembrane, and extracellular domains. The extracellular domain is a hollow needle protruding above the bacterial surface and is held within a basal body that traverses both bacterial membranes. Effector proteins are translocated, via this external needle, directly into host cells, where they subvert normal cell functions to aid infection. Physical contact with host cells initiates secretion and leads to formation of a pore, thought to be contiguous with the needle channel, in the host-cell membrane. Here, we report the crystal structure of the Shigella flexneri needle subunit MxiH and a complete model for the needle assembly built into our three-dimensional EM reconstruction. The model, combined with mutagenesis data, reveals that signaling of host-cell contact is relayed through the needle via intersubunit contacts and suggests a mode of binding for a tip complex. #1: ジャーナル: J Biol Chem / 年: 2003 タイトル: Helical structure of the needle of the type III secretion system of Shigella flexneri. 著者: Frank S Cordes / Kaoru Komoriya / Eric Larquet / Shixin Yang / Edward H Egelman / Ariel Blocker / Susan M Lea / 要旨: Gram-negative bacteria commonly interact with animal and plant hosts using type III secretion systems (TTSSs) for translocation of proteins into eukaryotic cells during infection. 10 of the 25 TTSS- ...Gram-negative bacteria commonly interact with animal and plant hosts using type III secretion systems (TTSSs) for translocation of proteins into eukaryotic cells during infection. 10 of the 25 TTSS-encoding genes are homologous to components of the bacterial flagellar basal body, which the TTSS needle complex morphologically resembles. This indicates a common ancestry, although no TTSS sequence homologues for the genes encoding the flagellum are found. We here present an approximately 16-A structure of the central component, the needle, of the TTSS. Although the needle subunit is significantly smaller and shares no sequence homology with the flagellar hook and filament, it shares a common helical architecture ( approximately 5.6 subunits/turn, 24-A helical pitch). This common architecture implies that there will be further mechanistic analogies in the functioning of these two bacterial systems. | ||||||
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 | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 2v6l.cif.gz | 66.4 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb2v6l.ent.gz | 45.3 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 2v6l.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
文書・要旨 | 2v6l_validation.pdf.gz | 795.3 KB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 2v6l_full_validation.pdf.gz | 795.8 KB | 表示 | |
XML形式データ | 2v6l_validation.xml.gz | 26.7 KB | 表示 | |
CIF形式データ | 2v6l_validation.cif.gz | 43.1 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/v6/2v6l ftp://data.pdbj.org/pub/pdb/validation_reports/v6/2v6l | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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-要素
#1: タンパク質 | 分子量: 9272.265 Da / 分子数: 28 / 由来タイプ: 組換発現 詳細: RESIDUES 2-19 WERE MODELLED AS AN ALPHA HELIX. RESIDUES 20-80 COME FROM MOLECULE A OF PDB ENTRY 2CA5 RESIDUES 81-85 WERE MODELLED AS AN ALPHA HELIX. 由来: (組換発現) SHIGELLA FLEXNERI (フレクスナー赤痢菌) 株: PWR100 / プラスミド: PET22B / 発現宿主: Escherichia coli BL21(DE3) (大腸菌) / 参照: UniProt: P0A223 |
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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: FILAMENT / 3次元再構成法: らせん対称体再構成法 |
-試料調製
構成要素 | 名称: SHIGELLA FLEXNERI TYPE THREE SECRETION NEEDLE / タイプ: COMPLEX / 詳細: STAINED WITH A DROP OF 2% URANYL ACETATE, PH 7.5 |
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緩衝液 | 名称: 10 MM TRIS / pH: 7.5 / 詳細: 10 MM TRIS |
試料 | 濃度: 0.03 mg/ml / 包埋: NO / シャドウイング: NO / 染色: YES / 凍結: NO |
染色 | タイプ: NEGATIVE / 染色剤: Uranyl Acetate |
急速凍結 | 凍結剤: ETHANE |
-電子顕微鏡撮影
顕微鏡 | モデル: FEI/PHILIPS CM200T / 詳細: OTHER |
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電子銃 | 電子線源: LAB6 / 加速電圧: 120 kV / 照射モード: FLOOD BEAM |
電子レンズ | モード: BRIGHT FIELD / 倍率(公称値): 60000 X / 最大 デフォーカス(公称値): 700 nm / 最小 デフォーカス(公称値): 700 nm |
撮影 | 電子線照射量: 10 e/Å2 / フィルム・検出器のモデル: GENERIC FILM |
放射波長 | 相対比: 1 |
-解析
EMソフトウェア |
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CTF補正 | 詳細: GRID | ||||||||||||
3次元再構成 | 手法: RECIPROCAL SPACE RIGID BODY FIT / 解像度: 16 Å / 粒子像の数: 5000 / ピクセルサイズ(公称値): 2.65 Å 詳細: A SET OF X-RAY STRUCTURE FACTORS WERE COMPUTED BY PLACING THE EM DENSITY IN A CRYSTAL CELL. THE MXIH MONOMER WAS RIGID BODY REFINED AGAINST THESE DATA WITH HARD NCS CONSTRAINTS. THE EM ...詳細: A SET OF X-RAY STRUCTURE FACTORS WERE COMPUTED BY PLACING THE EM DENSITY IN A CRYSTAL CELL. THE MXIH MONOMER WAS RIGID BODY REFINED AGAINST THESE DATA WITH HARD NCS CONSTRAINTS. THE EM DENSITY FOR THE NEEDLE WAS PUT IN THIS P1 CRYSTAL CELL SO THAT SINGLE CRYSTAL X-RAY MODEL REFINEMENT PROGRAMS COULD BE USED TO FIT THE MODEL. 対称性のタイプ: HELICAL | ||||||||||||
原子モデル構築 | プロトコル: OTHER / 空間: RECIPROCAL / Target criteria: Cross-correlation coefficient 詳細: METHOD--RECIPROCAL SPACE FIT REFINEMENT PROTOCOL--X-RAY | ||||||||||||
原子モデル構築 | PDB-ID: 2CA5 Accession code: 2CA5 / Source name: PDB / タイプ: experimental model | ||||||||||||
精密化 | 最高解像度: 16 Å | ||||||||||||
精密化ステップ | サイクル: LAST / 最高解像度: 16 Å
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