+検索条件
-Structure paper
タイトル | Mechanism of Tc toxin action revealed in molecular detail. |
---|---|
ジャーナル・号・ページ | Nature, Vol. 508, Issue 7494, Page 61-65, Year 2014 |
掲載日 | 2014年4月3日 |
著者 | Dominic Meusch / Christos Gatsogiannis / Rouslan G Efremov / Alexander E Lang / Oliver Hofnagel / Ingrid R Vetter / Klaus Aktories / Stefan Raunser / |
PubMed 要旨 | Tripartite Tc toxin complexes of bacterial pathogens perforate the host membrane and translocate toxic enzymes into the host cell, including in humans. The underlying mechanism is complex but poorly ...Tripartite Tc toxin complexes of bacterial pathogens perforate the host membrane and translocate toxic enzymes into the host cell, including in humans. The underlying mechanism is complex but poorly understood. Here we report the first, to our knowledge, high-resolution structures of a TcA subunit in its prepore and pore state and of a complete 1.7 megadalton Tc complex. The structures reveal that, in addition to a translocation channel, TcA forms four receptor-binding sites and a neuraminidase-like region, which are important for its host specificity. pH-induced opening of the shell releases an entropic spring that drives the injection of the TcA channel into the membrane. Binding of TcB/TcC to TcA opens a gate formed by a six-bladed β-propeller and results in a continuous protein translocation channel, whose architecture and properties suggest a novel mode of protein unfolding and translocation. Our results allow us to understand key steps of infections involving Tc toxins at the molecular level. |
リンク | Nature / PubMed:24572368 |
手法 | EM (単粒子) / X線回折 |
解像度 | 2.17 - 9.0 Å |
構造データ | EMDB-2551: EMDB-2552: PDB-4o9x: PDB-4o9y: |
化合物 | ChemComp-HG: ChemComp-HOH: |
由来 |
|
キーワード | TOXIN / beta sheet / cocoon / unfolding / tc toxin / pore-forming / transmembrane |