- EMDB-24734: Cryo-EM map of the end of T3SS needle -
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基本情報
登録情報
データベース: EMDB / ID: EMD-24734
タイトル
Cryo-EM map of the end of T3SS needle
マップデータ
End of T3SS needle
試料
複合体: T3SS needle filament end
タンパク質・ペプチド: PrgI
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
Type III secretion systems tip complex components / BipD-like superfamily / Type III secretion systems tip complex components / 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 類似検索 - ドメイン・相同性
Cell invasion protein SipD / SPI-1 type 3 secretion system needle filament protein 類似検索 - 構成要素
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
AI030492
米国
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2021 タイトル: Cryo-EM structure of the needle filament tip complex of the type III secretion injectisome. 著者: Emily Z Guo / Jorge E Galán / 要旨: Type III secretion systems are multiprotein molecular machines required for the virulence of several important bacterial pathogens. The central element of these machines is the injectisome, a ∼5-Md ...Type III secretion systems are multiprotein molecular machines required for the virulence of several important bacterial pathogens. The central element of these machines is the injectisome, a ∼5-Md multiprotein structure that mediates the delivery of bacterially encoded proteins into eukaryotic target cells. The injectisome is composed of a cytoplasmic sorting platform, and a membrane-embedded needle complex, which is made up of a multiring base and a needle-like filament that extends several nanometers from the bacterial surface. The needle filament is capped at its distal end by another substructure known as the tip complex, which is crucial for the translocation of effector proteins through the eukaryotic cell plasma membrane. Here we report the cryo-EM structure of the Typhimurium needle tip complex docked onto the needle filament tip. Combined with a detailed analysis of structurally guided mutants, this study provides major insight into the assembly and function of this essential component of the type III secretion protein injection machine.