Sandra Amandine Marie Geslain, Stéphane Hausmann, Johan Geiser, George Edward Allen, Diego Gonzalez, Martina Valentini
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引用次数: 0
Abstract
The RNA degradosome is a bacterial multi-protein complex mediating mRNA processing and degradation. In Pseudomonadota, this complex assembles on the C-terminal domain (CTD) of RNase E through short linear motifs (SLiMs) that determine its composition and functionality. In the human pathogen Pseudomonas aeruginosa, the RNase E CTD exhibits limited similarity to that of model organisms, impeding our understanding of RNA metabolic processes in this bacterium. Our study systematically maps the interactions mediated by the P. aeruginosa RNase E CTD and highlights its critical role in transcript regulation and cellular functions. We identified the SLiMs crucial for membrane attachment, RNA binding and complex clustering, as well as for direct binding to the core components PNPase and RhlB. Transcriptome analyses of RNase E CTD mutants revealed altered expression of genes involved in quorum sensing, type III secretion, and amino acid metabolism. Additionally, we show that the mutants are impaired in cold adaptation, pH response, and virulence in an infection model. Overall, this work establishes the essential role of the RNA degradosome in driving bacterial adaptability and pathogenicity.
RNA降解体是一种介导mRNA加工和降解的细菌多蛋白复合物。在假单胞菌中,这种复合物通过短线性基序(slms)组装在RNase E的c端结构域(CTD)上,这决定了它的组成和功能。在人类病原体铜绿假单胞菌中,RNase E CTD与模式生物表现出有限的相似性,阻碍了我们对这种细菌中RNA代谢过程的理解。我们的研究系统地绘制了铜绿假单胞菌RNase E CTD介导的相互作用,并强调了其在转录调控和细胞功能中的关键作用。我们确定了对膜附着、RNA结合和复杂聚类以及直接结合核心成分PNPase和RhlB至关重要的slim。RNase E CTD突变体的转录组分析显示,参与群体感应、III型分泌和氨基酸代谢的基因表达发生了改变。此外,在感染模型中,我们发现突变体在冷适应、pH反应和毒力方面受损。总的来说,这项工作确立了RNA降解体在驱动细菌适应性和致病性中的重要作用。
期刊介绍:
PLOS Genetics is run by an international Editorial Board, headed by the Editors-in-Chief, Greg Barsh (HudsonAlpha Institute of Biotechnology, and Stanford University School of Medicine) and Greg Copenhaver (The University of North Carolina at Chapel Hill).
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