全基因组遗传筛选确定宿主泛素化对嗜肺军团菌Dot/Icm效应易位很重要

IF 2.6 2区 生物学 Q3 CELL BIOLOGY
Sze Ying Ong, Ralf Schuelein, Rachelia R. Wibawa, Daniel W. Thomas, Yanny Handoko, Saskia Freytag, Melanie Bahlo, Kaylene J. Simpson, Elizabeth L. Hartland
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引用次数: 5

摘要

嗜肺军团菌的Dot/Icm系统对毒力至关重要,并将大量效应器传递到受感染的宿主细胞中,以产生含有军团菌的液泡。由于在没有宿主细胞的情况下,通过Dot/Icm系统的效应器分泌不会发生,因此我们假设宿主因子积极参与Dot/Icm效应器易位。本研究采用高通量全基因组siRNA筛选技术,系统测试了18120个人类基因沉默对Dot/Icm效应物RalF易位到HeLa细胞的影响。对于初级筛选,我们发现119个基因沉默导致RalF易位增加,而321个基因沉默导致易位减少。经过二次筛选,70个基因被成功验证为“高置信度”靶标。导致RalF易位减少的sirna的基因集富集分析表明,泛素化是通路分析中最具代表性的类别。我们进一步发现E2泛素结合酶(UBE2E1)和E3泛素连接酶(CUL7)这两个宿主因子对于支持Dot/Icm易位和嗜肺乳杆菌细胞内复制很重要。总之,我们发现宿主泛素途径对嗜肺乳杆菌Dot/Icm效应蛋白易位的效率很重要,这表明宿主来源的泛素偶联酶和泛素连接酶参与军团菌效应蛋白的易位并影响细胞内持久性和存活。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Genome-wide genetic screen identifies host ubiquitination as important for Legionella pneumophila Dot/Icm effector translocation

Genome-wide genetic screen identifies host ubiquitination as important for Legionella pneumophila Dot/Icm effector translocation

The Dot/Icm system of Legionella pneumophila is essential for virulence and delivers a large repertoire of effectors into infected host cells to create the Legionella containing vacuole. Since the secretion of effectors via the Dot/Icm system does not occur in the absence of host cells, we hypothesised that host factors actively participate in Dot/Icm effector translocation. Here we employed a high-throughput, genome-wide siRNA screen to systematically test the effect of silencing 18,120 human genes on translocation of the Dot/Icm effector, RalF, into HeLa cells. For the primary screen, we found that silencing of 119 genes led to increased translocation of RalF, while silencing of 321 genes resulted in decreased translocation. Following secondary screening, 70 genes were successfully validated as ‘high confidence’ targets. Gene set enrichment analysis of siRNAs leading to decreased RalF translocation, showed that ubiquitination was the most highly overrepresented category in the pathway analysis. We further showed that two host factors, the E2 ubiquitin-conjugating enzyme, UBE2E1, and the E3 ubiquitin ligase, CUL7, were important for supporting Dot/Icm translocation and L. pneumophila intracellular replication. In summary, we identified host ubiquitin pathways as important for the efficiency of Dot/Icm effector translocation by L. pneumophila, suggesting that host-derived ubiquitin-conjugating enzymes and ubiquitin ligases participate in the translocation of Legionella effector proteins and influence intracellular persistence and survival.

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来源期刊
Cellular Microbiology
Cellular Microbiology 生物-微生物学
CiteScore
9.70
自引率
0.00%
发文量
26
审稿时长
3 months
期刊介绍: Cellular Microbiology aims to publish outstanding contributions to the understanding of interactions between microbes, prokaryotes and eukaryotes, and their host in the context of pathogenic or mutualistic relationships, including co-infections and microbiota. We welcome studies on single cells, animals and plants, and encourage the use of model hosts and organoid cultures. Submission on cell and molecular biological aspects of microbes, such as their intracellular organization or the establishment and maintenance of their architecture in relation to virulence and pathogenicity are also encouraged. Contributions must provide mechanistic insights supported by quantitative data obtained through imaging, cellular, biochemical, structural or genetic approaches.
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