Structure of the type III secretion effector protein ExoU in complex with its chaperone SpcU.

Structure of the type III secretion effector protein ExoU in complex with its chaperone SpcU.
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III型分泌效应蛋白与其伴侣SPCU复合物的结构。

DOI:
10.1371/journal.pone.0049388
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Anderson WF
Anderson WF
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Halavaty AS;Borek D;Tyson GH;Veesenmeyer JL;Shuvalova L;Minasov G;Otwinowski Z;Hauser AR;Anderson WF

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致病细菌经常以一种促进感染过程的方式操纵宿主细胞。许多致病的革兰氏阴性细菌通过使用III型分泌系统来实现这一点。在这些复杂的分泌途径中,细菌伴侣将效应蛋白引导到一个针状的分泌器,然后将效应蛋白输送到宿主细胞胞浆中。效应蛋白ExoU及其伴侣SPCU是铜绿假单胞菌III型分泌系统的组成部分。在人类和动物模型中,ExoU的分泌都与更严重的感染有关。这里我们描述了ExoU-SPCU复合体的1.92äX射线结构,ExoU-SPCU复合体中的全长III型效应器及其全长同源伴侣。我们的结晶学数据使我们能够更好地了解ExoU杀死宿主细胞的机制,并为未来旨在设计这种有效毒素的抑制剂的研究提供基础。
Disease causing bacteria often manipulate host cells in a way that facilitates the infectious process. Many pathogenic gram-negative bacteria accomplish this by using type III secretion systems. In these complex secretion pathways, bacterial chaperones direct effector proteins to a needle-like secretion apparatus, which then delivers the effector protein into the host cell cytosol. The effector protein ExoU and its chaperone SpcU are components of the Pseudomonas aeruginosa type III secretion system. Secretion of ExoU has been associated with more severe infections in both humans and animal models. Here we describe the 1.92 Å X-ray structure of the ExoU–SpcU complex, a full-length type III effector in complex with its full-length cognate chaperone. Our crystallographic data allow a better understanding of the mechanism by which ExoU kills host cells and provides a foundation for future studies aimed at designing inhibitors of this potent toxin.
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影响因子: --
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