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Vibrio parahaemolyticus FcrX, a Fur-controlled regulator that inhibits repression by Fur.
Molecular Microbiology ( IF 2.6 ) Pub Date : 2020-02-25 , DOI: 10.1111/mmi.14497
Maria L Morabe 1 , Linda L McCarter 1
Affiliation  

Iron is an essential nutrient for most organisms, but its limited availability and inherent toxicity necessitate the strict regulation of iron homeostasis. In bacteria, iron starvation affects a broad range of phenotypes including virulence, motility and biofilm formation. For Vibrio parahaemolyticus , a marine bacterium and pathogen, iron limitation is a signal modulating swarmer cell differentiation. In this work, we show the iron regulation of swarming works through the ferric uptake regulator protein Fur. We identified a new Fur‐controlled regulator that is upregulated upon iron starvation. FcrX is a 144‐amino acid protein containing a domain of unknown function (DUF2753) with three tetratricopeptide repeats. We found that overexpressing fcrX+ was sufficient to induce swarming, luminescence and iron uptake gene expression in multiple Vibrio species; furthermore, ectopic expression increased the transcription of a Fur‐controlled gene in Escherichia coli . FcrX production increased intracellular iron. Thus, the overexpression of fcrX+ phenocopied a fur mutant and may prove a generally useful tool to ectopically derepress the Fur regulon. Both V. parahaemolyticus and E. coli Fur interacted with FcrX, and this interaction was altered by iron availability. These data support a model in which this new regulator of iron homeostasis limits the repressive action of Fur.

中文翻译:

副溶血弧菌FcrX,一种由Fur控制的调节剂,可抑制Fur的阻抑作用。

铁是大多数生物体必不可少的营养素,但是铁的有限可用性和固有的毒性使得必须严格调节铁的稳态。在细菌中,铁饥饿会影响广泛的表型,包括毒力,运动性和生物膜形成。对于副溶血性弧菌一种海洋细菌和病原体)铁的限制是调节成群细胞分化的信号。在这项工作中,我们显示了通过铁摄取调节蛋白Fur对群聚工作的铁调节。我们确定了新的˚F UR- C ^ ontrolled [R在饥饿时被上调的调节子。FcrX是一种144个氨基酸的蛋白质,包含功能未知的结构域(DUF2753)和三个四肽重复。我们发现,fcrX +的 过表达足以诱导多个弧菌中的蜂群,发光和铁摄取基因表达。此外,异位表达增加了大肠杆菌中Fur控制基因的转录。FcrX产生增加细胞内铁。因此,fcrX +的 表型超表达了fur突变体,并且可能被证明是异位抑制Fre regulon的通用工具。两个副溶血性弧菌大肠杆菌毛皮与FcrX相互作用,并且这种相互作用因铁的可用性而改变。这些数据支持了一种模型,其中该新的铁稳态调节剂限制了Fur的抑制作用。
更新日期:2020-02-25
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