Structure of a type IV secretion system core complex.

Structure of a type IV secretion system core complex.
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DOI:
10.1126/science.1166101
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发表时间:
2009-01-09
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Waksman G
Waksman G
中科院分区:
其他
文献类型:
--
作者:
Fronzes R;Schäfer E;Wang L;Saibil HR;Orlova EV;Waksman G

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IV型分泌系统(T4 SS)是革兰氏阴性细菌病原体用于将效应子注射到宿主细胞中或传播携带抗生素抗性基因的质粒的重要毒力因子。我们报告了T4 SS核心复合物的15 μ m分辨率冷冻电子显微镜结构。核心复合物由三种蛋白质组成,每种蛋白质存在14个拷贝,形成一个~1.1 MDa的双室双跨膜通道。该结构是双壁的,每个组件显然跨越了通道的大部分。复合物在细胞质侧开放,在细胞外侧收缩。总的来说,T4 SS核心复合物结构在结构和组成上都与其他已知的已在结构上表征的双跨膜分泌系统非常不同。
Type IV secretion systems (T4SSs) are important virulence factors used by Gram-negative bacterial pathogens to inject effectors into host cells or spread plasmids harbouring antibiotic resistance genes. We report the 15 Å resolution cryo-electron microscopy structure of the core complex of a T4SS. The core complex is composed of three proteins, each present in 14 copies and forming a ~1.1 MDa two-chambered, double membrane-spanning channel. The structure is double walled, with each component apparently spanning a large part of the channel. The complex is open on the cytoplasmic side and constricted on the extracellular side. Overall the T4SS core complex structure is very different in both architecture and composition from the other known double membrane spanning secretion system that has been structurally characterized.
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发表时间: 1997-02-01
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