当前位置: X-MOL 学术Cell. Microbiol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Coxiella burnetii encodes an LvgA‐related protein important for intracellular replication
Cellular Microbiology ( IF 2.6 ) Pub Date : 2021-03-27 , DOI: 10.1111/cmi.13331
Samuel Steiner 1 , Amit Meir 1 , Craig R Roy 1
Affiliation  

Coxiella burnetii is a bacterial pathogen that replicates in a specialised lysosome‐derived organelle called the Coxiella‐containing vacuole (CCV). Establishment of the CCV requires the Dot/Icm type IVB secretion system. A previous transposon mutagenesis screen identified the gene cbu1754 as being important for the intracellular replication of C. burnetii. To understand the function of the protein encoded by cbu1754, CCV maturation and intracellular replication phenotypes of a cbu1754 mutant were analysed. In contrast to vacuoles containing wild‐type C. burnetii Nine Mile phase II, vacuoles containing the isogenic cbu1754 mutant were smaller and did not display detectible amounts of the autophagy protein LC3, which indicated a CCV biogenesis defect. The Cbu1754 protein was not efficiently delivered into the host cell cytosol during infection, which indicated this protein is not a Dot/Icm‐translocated effector protein. Secondary structure predictions suggested that Cbu1754 could be similar to the Legionella pneumophila LvgA protein, which is a component of the Dot/Icm apparatus. Consistent with this hypothesis, production of Cbu1754 in an L. pneumophilalvgA mutant restored LvgA‐dependent activities. The L. pneumophila proteins LvgA, IcmS and IcmW are interacting partners that comprise a subassembly of the coupling protein complex that mediates Dot/Icm‐dependent effector translocation. Similarly, the Cbu1754 protein was found to be a component of the chaperone complex containing the C. burnetii proteins IcmS and IcmW. Thus, the Cbu1754 protein is an LvgA‐related protein important for Dot/Icm function and intracellular replication of C. burnetii.

中文翻译:

Coxiella burnetii 编码一种对细胞内复制很重要的 LvgA 相关蛋白

Coxiella burnetii是一种细菌病原体,它在一种特殊的溶酶体衍生细胞器中复制,称为含有Coxiella的液泡 (CCV)。CCV的建立需要Dot/Icm型IVB分泌系统。先前的转座子诱变筛选确定基因cbu1754C. burnetii的细胞内复制很重要。为了了解cbu1754编码的蛋白质的功能,分析了cbu1754突变体的CCV 成熟和细胞内复制表型。与含有野生型C. burnetii九英里 II 期的液泡相比,含有同基因cbu1754 的液泡突变体较小并且没有显示可检测量的自噬蛋白LC3,这表明CCV生物发生缺陷。Cbu1754 蛋白在感染过程中没有被有效地传递到宿主细胞的胞质溶胶中,这表明该蛋白不是 Dot/Icm 易位的效应蛋白。二级结构预测表明,Cbu1754 可能与嗜肺军团菌LvgA 蛋白相似,后者是 Dot/Icm 装置的一个组成部分。与这一假设一致,嗜肺军团菌Δ lvgA突变体中 Cbu1754 的产生恢复了 LvgA 依赖性活性。的嗜肺军团菌蛋白质 LvgA、IcmS 和 IcmW 是相互作用的伙伴,它们组成耦合蛋白复合物的子组件,介导 Dot/Icm 依赖性效应易位。类似地,发现 Cbu1754 蛋白是伴侣复合物的一个组成部分,该复合物含有C. burnetii蛋白 IcmS 和 IcmW。因此,Cbu1754 蛋白是一种 LvgA 相关蛋白,对C. burnetii 的Dot/Icm 功能和细胞内复制很重要。
更新日期:2021-05-12
down
wechat
bug