A view to a kill: the bacterial type VI secretion system.

A view to a kill: the bacterial type VI secretion system.
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DOI:
10.1016/j.chom.2013.11.008
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发表时间:
2014-01-15
影响因子:
30.3
通讯作者:
Mekalanos JJ
Mekalanos JJ
中科院分区:
医学1区
文献类型:
--
作者:
Ho BT;Dong TG;Mekalanos JJ

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细菌6型分泌系统(T6SS)是一种细胞器,在结构和机制上类似于细胞内膜附着的收缩性噬菌体尾。最近的研究确定,鞘蛋白复合物的结构中的快速构象变化推动T6 SS刺突和管组分沿着与抗细菌和抗真核生物效应物一起离开捕食性T6 SS+细胞并进入猎物细胞。然后,收缩的细胞器在ATP依赖性过程中被回收。T6 SS在转录和翻译后水平上受到调节,后者涉及某些物种中膜扰动的检测。除了直接靶向真核细胞外,T6SS还可以靶向共同感染哺乳动物宿主的其他细菌,这突出了T6SS不仅对环境生态系统中的细菌存活而且在感染和疾病背景下的重要性。这篇综述强调了这些和其他进展,我们的理解的结构,机械功能,组装和调节的T6 SS。
The bacterial Type 6 Secretion System (T6SS) is an organelle that is structurally and mechanistically analogous to an intracellular membrane-attached contractile phage tail. Recent studies determined that a rapid conformational change in the structure of a sheath protein complex propels T6SS spike and tube components along with anti-bacterial and anti-eukaryotic effectors out of predatory T6SS+ cells and into prey cells. The contracted organelle is then recycled in an ATP-dependent process. T6SS is regulated at transcriptional and post-translational levels, the latter involving detection of membrane perturbation in some species. In addition to directly targeting eukaryotic cells, the T6SS can also target other bacteria co-infecting a mammalian host, highlighting the importance of the T6SS not only for bacterial survival in environmental ecosystems but also in the context of infection and disease. This review highlights these and other advances in our understanding of the structure, mechanical function, assembly, and regulation of the T6SS.
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