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Updated: Jun 29, 2025

High-throughput Assay to Phenotype Salmonella enterica Typhimurium Association, Invasion, and Replication in Macrophages

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Published on: August 11, 2014

具有tRNase活动的体终结酶对Salmonella enterica具有氧化应激的敏感性

Siva Uppalapati¹, Sashi Kant¹, Lin Liu¹

¹University of Colorado School of Medicine, Department of Immunology and Microbiology, Aurora, CO, USA.

Science (New York, N.Y.)

|April 4, 2024

概括

沙门氏菌

科学领域:

微生物学
分子生物学
病毒学

背景情况:

菌体 (菌体) 是感染细菌并影响其进化的病毒.
沙门氏体内含有应激诱导的菌体,包括Gifsy-1.
体蛋白可以有病毒复制之外的功能.

研究的目的:

为了研究Gifsy-1预兆终结酶蛋白的非正规功能.
了解沙门氏菌对氧化压力引起的RNA损伤的反应.
探索tRNA分裂对细菌生存和宿主病原体相互作用的影响.

主要方法:

在氧化应激下研究了Gifsy-1终酶的酶活性.
使用RNA测序分析转移RNA (tRNA) 分裂产物.
评估了tRNA碎片化对宿主模型中的细菌翻译和存活的影响.
研究了RNA修复Rtc系统在沙门氏菌适应中的作用.

主要成果:

在氧化应激下,Gifsy-1终结酶作为转移核糖酶 (tRNase) 起作用,分裂tRNA的抗环.
tRNA碎片化会影响细菌的翻译,细胞内生存和氧化应激的恢复.
沙门氏菌对RNA修复Rtc系统进行上调,以抵消tRNA损伤.
tRNA裂变可能会抑制孕细胞动员,有助于细菌基因组完整性和生存.

结论:

在压力下作为tRNase,Gifsy-1的prophage终结酶具有双重作用.
细菌适应涉及RNA修复机制以减轻菌体诱导的转化破坏.
菌体和宿主之间的这种相互作用凸显了脊椎动物宿主中的沙门氏菌的新生存策略.

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