- EMDB-15701: Outer membrane secretin pore of the type 3 secretion system of Sh... -
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基本情報
登録情報
データベース: EMDB / ID: EMD-15701
タイトル
Outer membrane secretin pore of the type 3 secretion system of Shigella flexneri
マップデータ
Main map sharpened and masked
試料
複合体: Needle complex of the type 3 secretion system
複合体: Outer membrane secretin pore of the type 3 secretion system
タンパク質・ペプチド: Outer membrane protein MxiD
キーワード
type 3 secretion / secretin / outer membrane ring / shigella / infection / PROTEIN TRANSPORT
機能・相同性
機能・相同性情報
type III protein secretion system complex / type II protein secretion system complex / protein secretion by the type III secretion system / cell outer membrane 類似検索 - 分子機能
: / SPI-1 type 3 secretion system secretin, N0 domain / Type III secretion system outer membrane pore YscC/HrcC / Bacterial type II secretion system protein D signature. / Type II secretion system protein GspD, conserved site / : / NolW-like / NolW-like superfamily / Bacterial type II/III secretion system short domain / Type II/III secretion system / Bacterial type II and III secretion system protein 類似検索 - ドメイン・相同性
ジャーナル: Protein Sci / 年: 2023 タイトル: Integrative structural analysis of the type III secretion system needle complex from Shigella flexneri. 著者: Lara Flacht / Michele Lunelli / Karol Kaszuba / Zhuo Angel Chen / Francis J O' Reilly / Juri Rappsilber / Jan Kosinski / Michael Kolbe / 要旨: The type III secretion system (T3SS) is a large, transmembrane protein machinery used by various pathogenic gram-negative bacteria to transport virulence factors into the host cell during infection. ...The type III secretion system (T3SS) is a large, transmembrane protein machinery used by various pathogenic gram-negative bacteria to transport virulence factors into the host cell during infection. Understanding the structure of T3SSs is crucial for future developments of therapeutics that could target this system. However, much of the knowledge about the structure of T3SS is available only for Salmonella, and it is unclear how this large assembly is conserved across species. Here, we combined cryo-electron microscopy, cross-linking mass spectrometry, and integrative modeling to determine the structure of the T3SS needle complex from Shigella flexneri. We show that the Shigella T3SS exhibits unique features distinguishing it from other structurally characterized T3SSs. The secretin pore complex adopts a new fold of its C-terminal S domain and the pilotin MxiM[SctG] locates around the outer surface of the pore. The export apparatus structure exhibits a conserved pseudohelical arrangement but includes the N-terminal domain of the SpaS[SctU] subunit, which was not present in any of the previously published virulence-related T3SS structures. Similar to other T3SSs, however, the apparatus is anchored within the needle complex by a network of flexible linkers that either adjust conformation to connect to equivalent patches on the secretin oligomer or bind distinct surface patches at the same height of the export apparatus. The conserved and unique features delineated by our analysis highlight the necessity to analyze T3SS in a species-specific manner, in order to fully understand the underlying molecular mechanisms of these systems. The structure of the type III secretion system from Shigella flexneri delineates conserved and unique features, which could be used for the development of broad-range therapeutics.
全体 : Needle complex of the type 3 secretion system
全体
名称: Needle complex of the type 3 secretion system
要素
複合体: Needle complex of the type 3 secretion system
複合体: Outer membrane secretin pore of the type 3 secretion system
タンパク質・ペプチド: Outer membrane protein MxiD
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超分子 #1: Needle complex of the type 3 secretion system
超分子
名称: Needle complex of the type 3 secretion system / タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all
由来(天然)
生物種: Shigella flexneri (フレクスナー赤痢菌)
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超分子 #2: Outer membrane secretin pore of the type 3 secretion system
超分子
名称: Outer membrane secretin pore of the type 3 secretion system タイプ: complex / ID: 2 / 親要素: 1 / 含まれる分子: all 詳細: Pore formed by the oligomerization of the domains N3, Secretin and S of MxiD