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-Structure paper
| タイトル | A nonenzymatic effector disrupts cell wall homeostasis via OmpA targeting to mediate interbacterial competition. |
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| ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 122, Issue 41, Page e2513207122, Year 2025 |
| 掲載日 | 2025年10月14日 |
著者 | Jing He / Zhe Chen / Kun Jiang / Yan Yang / Weixun Li / Xiaotong Wang / Xiaoning Xu / Shuaining Zheng / Xuyao Jiao / Xudong Chen / Liujie Huo / Bentley Lim / Shuang-Jiang Liu / Xiang Gao / ![]() |
| PubMed 要旨 | The human gut microbiome is a dynamic ecosystem where bacteria engage in interspecies competition using molecular weapons such as the type VI secretion system (T6SS). Here, we characterize BteO-BtiO, ...The human gut microbiome is a dynamic ecosystem where bacteria engage in interspecies competition using molecular weapons such as the type VI secretion system (T6SS). Here, we characterize BteO-BtiO, a unique effector-immunity pair in that mediates antagonism via a nonenzymatic mechanism. Microscopy reveals that BteO exposure leads to cell elongation, membrane blebbing, and lysis in sensitive strains. Structural and biochemical analyses demonstrate that BteO disrupts cell wall homeostasis by binding to conserved C-terminal domains of OmpA-family proteins (OmpAs), which are critical for outer membrane integrity. The immunity protein BtiO neutralizes BteO by mimicking the OmpA-binding interface. We further show that bile salts enhance BteO-mediated killing in vitro and that BteO confers a competitive advantage in the mammalian gut. Remarkably, BteO exhibits broad-spectrum activity across species. These findings reveal a nonenzymatic strategy of bacterial antagonism and broaden our understanding of T6SS effector diversity within . |
リンク | Proc Natl Acad Sci U S A / PubMed:41055976 / PubMed Central |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 1.9 - 4.18 Å |
| 構造データ | ![]() EMDB-64503: Bacteroides fragilis T6SS effector-immunity BteO-BtiO complex ![]() PDB-9uu0: ![]() PDB-9uu1: ![]() PDB-9uu2: |
| 化合物 | ![]() ChemComp-HOH: ![]() ChemComp-IPA: |
| 由来 |
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キーワード | TOXIN / Bacteroides fragilis T6SS effector / ANTITOXIN / Bacteroides fragilis T6SS immunity protein / STRUCTURAL PROTEIN / Outer membrane protein OmpA-c-like domain |
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bacteroides fragilis (バクテリア)
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