- EMDB-3564: Subtomogram average of type VI secretion system (T6SS) contracted... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-3564
タイトル
Subtomogram average of type VI secretion system (T6SS) contracted sheath
マップデータ
試料
細胞器官・細胞要素: Type VI secretion system contracted sheath
タンパク質・ペプチド: vipA
タンパク質・ペプチド: vipB
機能・相同性
Type VI secretion system TssC-like / TssC1, N-terminal / TssC1, C-terminal / EvpB/VC_A0108, tail sheath N-terminal domain / EvpB/VC_A0108, tail sheath gpW/gp25-like domain / Type VI secretion system sheath protein TssB1 / Type VI secretion system, VipA, VC_A0107 or Hcp2 / Type VI secretion protein / Type VI secretion system contractile sheath small subunit
ジャーナル: Nat Microbiol / 年: 2017 タイトル: Cryo-EM structure of the extended type VI secretion system sheath-tube complex. 著者: Jing Wang / Maximilian Brackmann / Daniel Castaño-Díez / Mikhail Kudryashev / Kenneth N Goldie / Timm Maier / Henning Stahlberg / Marek Basler / 要旨: The bacterial type VI secretion system (T6SS) uses contraction of a long sheath to quickly thrust a tube with associated effectors across membranes of eukaryotic and bacterial cells . Only limited ...The bacterial type VI secretion system (T6SS) uses contraction of a long sheath to quickly thrust a tube with associated effectors across membranes of eukaryotic and bacterial cells . Only limited structural information is available about the inherently unstable precontraction state of the T6SS. Here, we obtain a 3.7 Å resolution structure of a non-contractile sheath-tube complex using cryo-electron microscopy and show that it resembles the extended T6SS inside Vibrio cholerae cells. We build a pseudo-atomic model of the complete sheath-tube assembly, which provides a mechanistic understanding of coupling sheath contraction with pushing and rotating the inner tube for efficient target membrane penetration. Our data further show that sheath contraction exposes a buried recognition domain to specifically trigger the disassembly and recycling of the T6SS sheath by the cognate ATP-dependent unfoldase ClpV.