- EMDB-6120: Structure of a mycobacterial protein -
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基本情報
登録情報
データベース: EMDB / ID: EMD-6120
タイトル
Structure of a mycobacterial protein
マップデータ
Reconstruction of mycobacterial protein
試料
試料: Mycobacterial protein
タンパク質・ペプチド: Mycobacterial protein
機能・相同性
ESX-1 secretion-associated protein EspB, PE domain / ESX-1 secreted protein B PE domain / protein secretion by the type VII secretion system / PPE superfamily / biological process involved in interaction with host / extracellular region / identical protein binding / ESX-1 secretion-associated protein EspB
ジャーナル: Structure / 年: 2015 タイトル: Structure of EspB from the ESX-1 type VII secretion system and insights into its export mechanism. 著者: Matthew Solomonson / Dheva Setiaputra / Karl A T Makepeace / Emilie Lameignere / Evgeniy V Petrotchenko / Deborah G Conrady / Julien R Bergeron / Marija Vuckovic / Frank DiMaio / Christoph H ...著者: Matthew Solomonson / Dheva Setiaputra / Karl A T Makepeace / Emilie Lameignere / Evgeniy V Petrotchenko / Deborah G Conrady / Julien R Bergeron / Marija Vuckovic / Frank DiMaio / Christoph H Borchers / Calvin K Yip / Natalie C J Strynadka / 要旨: Mycobacterium tuberculosis (Mtb) uses the ESX-1 type VII secretion system to export virulence proteins across its lipid-rich cell wall, which helps permeabilize the host's macrophage phagosomal ...Mycobacterium tuberculosis (Mtb) uses the ESX-1 type VII secretion system to export virulence proteins across its lipid-rich cell wall, which helps permeabilize the host's macrophage phagosomal membrane, facilitating the escape and cell-to-cell spread of Mtb. ESX-1 membranolytic activity depends on a set of specialized secreted Esp proteins, the structure and specific roles of which are not currently understood. Here, we report the X-ray and electron microscopic structures of the ESX-1-secreted EspB. We demonstrate that EspB adopts a PE/PPE-like fold that mediates oligomerization with apparent heptameric symmetry, generating a barrel-shaped structure with a central pore that we propose contributes to the macrophage killing functions of EspB. Our structural data also reveal unexpected direct interactions between the EspB bipartite secretion signal sequence elements that form a unified aromatic surface. These findings provide insight into how specialized proteins encoded within the ESX-1 locus are targeted for secretion, and for the first time indicate an oligomerization-dependent role for Esp virulence factors.
試料ホルダー: side entry room temperature tomography holder 試料ホルダーモデル: SIDE ENTRY, EUCENTRIC
実験機器
モデル: Tecnai Spirit / 画像提供: FEI Company
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画像解析
最終 再構成
解像度のタイプ: BY AUTHOR / 解像度: 30.0 Å / 解像度の算出法: OTHER / ソフトウェア - 名称: Spider, EMAN2 詳細: Initial reconstructions were determined from a side-view 2D average based on observed 7-fold symmetry of the top view using a rotational extrusion method. The initial model was then refined ...詳細: Initial reconstructions were determined from a side-view 2D average based on observed 7-fold symmetry of the top view using a rotational extrusion method. The initial model was then refined in 6 iterations with EMAN2 using untilted particles. 使用した粒子像数: 1455