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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Structure of HrcQ_B-C, a conserved component of the bacterial type III secretion systems
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Structure of HrcQ_B-C, a conserved component of the bacterial type III secretion systems

机译:HrcQ_B-C的结构,III型细菌分泌系统的保守成分

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摘要

Type III secretion systems enable plant and animal bacterial pathogens to deliver virulence proteins into the cytosol of eukaryotic host cells, causing a broad spectrum of diseases including bacte-remia, septicemia, typhoid fever, and bubonic plague in mammals, and localized lesions, systemic wilting, and blights in plants. In addition, type III secretion systems are also required for biogenesis of the bacterial flagellum. The HrcQ_B protein, a component of the secretion apparatus of Pseudomonas syringae with homologues in all type III systems, has a variable N-terminal and a conserved C-terminal domain (HrcQ_B-C). Here, we report the crystal structure of HrcQ_B-C and show that this domain retains the ability of the full-length protein to interact with other type III components. A 3D analysis of sequence conservation patterns reveals two clusters of residues potentially involved in protein-protein interactions. Based on the analogies between HrcQ_B and its flagellum homologues, we propose that HrcQ_B-C participates in the formation of a C-ring-like assembly.
机译:III型分泌系统使植物和动物细菌病原体能够将毒力蛋白传递到真核宿主细胞的胞质溶胶中,从而引起多种疾病,包括哺乳动物的杆菌血症,败血病,伤寒和鼠疫,以及局部病变,系统性萎,并在植物中枯萎。另外,细菌鞭毛的生物发生也需要III型分泌系统。 HrcQ_B蛋白是丁香假单胞菌分泌装置的组成部分,在所有III型系统中具有同源性,它具有可变的N末端和保守的C末端结构域(HrcQ_B-C)。在这里,我们报告HrcQ_B-C的晶体结构,并显示此域保留了全长蛋白质与其他III型成分相互作用的能力。序列保守性模式的3D分析揭示了可能涉及蛋白质-蛋白质相互作用的两个残基簇。基于HrcQ_B及其鞭毛同源物之间的类比,我们建议HrcQ_B-C参与形成C环样装配。

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