- PDB-2mme: Hybrid structure of the Shigella flexneri MxiH Type three secreti... -
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基本情報
登録情報
データベース: PDB / ID: 2mme
タイトル
Hybrid structure of the Shigella flexneri MxiH Type three secretion system needle
要素
MxiH
キーワード
PROTEIN TRANSPORT / type-three secretion system / filamentous protein / helical assembly / Shigella flexneri / protein translocation / hybrid methods / Rosetta
機能・相同性
Type III secretion, needle-protein-like / Type III secretion, needle-protein-like superfamily / Type III secretion needle MxiH, YscF, SsaG, EprI, PscF, EscF / Type III secretion system, needle protein / type III protein secretion system complex / protein secretion by the type III secretion system / cell surface / extracellular region / MxiH
ジャーナル: Proc Natl Acad Sci U S A / 年: 2012 タイトル: Structure of a type III secretion needle at 7-Å resolution provides insights into its assembly and signaling mechanisms. 著者: Takashi Fujii / Martin Cheung / Amandine Blanco / Takayuki Kato / Ariel J Blocker / Keiichi Namba / 要旨: Type III secretion systems of Gram-negative bacteria form injection devices that deliver effector proteins into eukaryotic cells during infection. They span both bacterial membranes and the ...Type III secretion systems of Gram-negative bacteria form injection devices that deliver effector proteins into eukaryotic cells during infection. They span both bacterial membranes and the extracellular space to connect with the host cell plasma membrane. Their extracellular portion is a needle-like, hollow tube that serves as a secretion conduit for effector proteins. The needle of Shigella flexneri is approximately 50-nm long and 7-nm thick and is made by the helical assembly of one protein, MxiH. We provide a 7-Å resolution 3D image reconstruction of the Shigella needle by electron cryomicroscopy, which resolves α-helices and a β-hairpin that has never been observed in the crystal and solution structures of needle proteins, including MxiH. An atomic model of the needle based on the 3D-density map, in comparison with that of the bacterial-flagellar filament, provides insights into how such a thin tubular structure is stably assembled by intricate intermolecular interactions. The map also illuminates how the needle-length control protein functions as a ruler within the central channel during export of MxiH for assembly at the distal end of the needle, and how the secretion-activation signal may be transduced through a conformational change of the needle upon host-cell contact.
THIS ENTRY 2MME CONTAINS A STRUCTURAL MODEL FIT TO AN ELECTRON MICROSCOPY MAP (EMD-5352) DETERMINED ...THIS ENTRY 2MME CONTAINS A STRUCTURAL MODEL FIT TO AN ELECTRON MICROSCOPY MAP (EMD-5352) DETERMINED ORIGINALLY BY AUTHORS: T.FUJII, M.CHEUNG, A.BLANCO, T.KATO, A.J.BLOCKER, K.NAMBA
モード: BRIGHT FIELD / 倍率(公称値): 50000 X / 最大 デフォーカス(公称値): 2000 nm / 最小 デフォーカス(公称値): 1000 nm
撮影
電子線照射量: 20 e/Å2 フィルム・検出器のモデル: TVIPS TEMCAM-F415 (4k x 4k)
NMRスペクトロメーター
タイプ: Bruker Avance / 製造業者: Bruker / モデル: AVANCE / 磁場強度: 850 MHz
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解析
3次元再構成
解像度: 7.7 Å / 対称性のタイプ: HELICAL
精密化ステップ
サイクル: LAST
タンパク質
核酸
リガンド
溶媒
全体
原子数
18763
0
0
0
18763
NMR software
名称
開発者
分類
Sparky
Goddard
データ解析
Rosetta
精密化
精密化
手法: Rosetta fold-and-dock, Rosetta symmetric relax / ソフトェア番号: 2 詳細: symmetric fragment-based Monte Carlo trials followed by full-atom refinement, symmetric refinement (relax) of backbone, sidechain, and rigid-body degrees of freedom
代表構造
選択基準: lowest energy
NMRアンサンブル
コンフォーマー選択の基準: target function / 計算したコンフォーマーの数: 5000 / 登録したコンフォーマーの数: 10