Atomic structure of T6SS reveals interlaced array essential to function.

Atomic structure of T6SS reveals interlaced array essential to function.
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DOI:
10.1016/j.cell.2015.02.005
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发表时间:
2015-02-26
期刊:
影响因子:
64.5
通讯作者:
Zhou ZH
Zhou ZH
中科院分区:
生物学1区
文献类型:
--
作者:
Clemens DL;Ge P;Lee BY;Horwitz MA;Zhou ZH

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VI型分泌系统(T6 SS)是新鉴定的收缩性纳米机器,其跨细菌膜转运效应蛋白。Francisella致病岛,所需的细菌吞噬体逃逸,细胞内复制和毒力,被假定为编码T6 SS样装置。在这里,我们通过实验确认了这种T6 SS的身份,并通过冷冻电子显微镜(cryoEM),显示了其收缩后鞘的结构,分辨率为3.7 μ m。我们证明了该T6 SS的组装IglA/IglB和其假定的效应蛋白的分泌响应于环境刺激。鞘具有四级结构,旋向与T4噬菌体尾的收缩鞘相反,并通过β折叠扩增以交错的二维阵列组织。基于结构的诱变,我们表明,这种交错是必不可少的分泌,吞噬体逃逸,和细胞内复制。我们的T6 SS原子模型将有助于设计针对这种高度流行的分泌装置的药物。
Type VI secretion systems (T6SSs) are newly identified contractile nanomachines that translocate effector proteins across bacterial membranes. The Francisella pathogenicity island, required for bacterial phagosome escape, intracellular replication and virulence, was presumed to encode a T6SS-like apparatus. Here, we experimentally confirm the identity of this T6SS and, by cryo electron microscopy (cryoEM), show the structure of its post-contraction sheath at 3.7 Å resolution. We demonstrate the assembly of this T6SS by IglA/IglB and secretion of its putative effector proteins in response to environmental stimuli. The sheath has a quaternary structure with handedness opposite that of contracted sheath of T4 phage tail and is organized in an interlaced two-dimensional array by means of β sheet augmentation. By structure-based mutagenesis, we show that this interlacing is essential to secretion, phagosomal escape, and intracellular replication. Our atomic model of the T6SS will facilitate design of drugs targeting this highly prevalent secretion apparatus.
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