+検索条件
-Structure paper
| タイトル | Structural insights into the antibacterial function of the Pseudomonas putida effector Tke5. |
|---|---|
| ジャーナル・号・ページ | EMBO J, Year 2026 |
| 掲載日 | 2026年1月12日 |
著者 | Carmen Velázquez / Maialen Zabala-Zearreta / Carmen Paredes / Cristina Civantos / Jon Altuna-Alvarez / Patricia Bernal / David Albesa-Jové / ![]() |
| PubMed 要旨 | Pseudomonas putida is a plant-beneficial rhizobacterium that encodes multiple type-VI secretion systems (T6SS) to outcompete phytopathogens in the rhizosphere. Among its antibacterial effectors, Tke5 ...Pseudomonas putida is a plant-beneficial rhizobacterium that encodes multiple type-VI secretion systems (T6SS) to outcompete phytopathogens in the rhizosphere. Among its antibacterial effectors, Tke5 (a member of the BTH_I2691 protein family) is a potent pore-forming toxin that disrupts ion homeostasis without causing considerable membrane damage. Tke5 harbours an N-terminal MIX domain, which is required for T6SS-dependent secretion in other systems. Many MIX domain-containing effectors require T6SS adaptor proteins (Tap) for secretion, but their molecular mechanisms of adaptor-effector binding remain elusive. Here, we report the 2.8 Å cryo-EM structure of the Tap3-Tke5 complex of P. putida strain KT2440, providing structural and functional insights into how effector Tke5 is recruited by its cognate adaptor protein Tap3. Functional dissection shows that the α-helical region of Tke5 is sufficient to kill intoxicated bacteria, while its β-rich region likely contributes to target membrane specificity. These findings delineate a mechanism of BTH_I2691 proteins for Tap recruitment and toxin activity, contributing to our understanding of a widespread yet understudied toxin family. |
リンク | EMBO J / PubMed:41526723 |
| 手法 | EM (単粒子) |
| 解像度 | 2.77 Å |
| 構造データ | EMDB-53820, PDB-9r8g: |
| 由来 |
|
キーワード | TOXIN / Pseudomonas putida T6SS effector / Pore-Forming Toxin / MIX family domain / adaptor protein |
ムービー
コントローラー
構造ビューア
万見文献について



著者
リンク

pseudomonas putida kt2440 (バクテリア)
キーワード