A single qrr gene is necessary and sufficient for LuxO-mediated regulation in Vibrio fischeri.

A single qrr gene is necessary and sufficient for LuxO-mediated regulation in Vibrio fischeri.
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DOI:
10.1111/j.1365-2958.2010.07309.x
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发表时间:
2010-09
影响因子:
3.6
通讯作者:
Ruby EG
Ruby EG
中科院分区:
生物学2区
文献类型:
--
作者:
Miyashiro T;Wollenberg MS;Cao X;Oehlert D;Ruby EG

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弧菌科的所有成员都含有 LuxO,这是一种反应调节器,可以整合各种信号系统的输出,最终控制对每个物种的独特生物学至关重要的特定性状。 LuxO 会因细胞密度较低而被磷酸化,从而激活 Qrrs 小 RNA 家族的转录,而 Qrrs 反过来又控制弧菌科内保守的全局调节蛋白的水平。尽管每个 Qrr 的功能相似,但不同物种之间 qrr 基因的数量有所不同。使用生物信息学方法,我们确定了完全测序的弧菌科成员中 qrr 基因的数量。系统发育分析表明,所有弧菌科的最近共同祖先共享一个单一的祖先 qrr 基因,该基因在当今的一些弧菌谱系中复制并分化为多个 qrr 基因。为了证明单个 qrr 基因足以介导 LitR(费氏弧菌的全局调节因子)的抑制,我们对 LuxO 途径及其输出进行了一系列遗传和表型分析。我们的研究有助于更好地了解弧菌中这些途径的祖先状态,以及不同细菌谱系中其他 sRNA 的进化和分化。
All members of the Vibrionaceae harbor LuxO, a response regulator that integrates outputs from various signaling systems, ultimately controlling specific traits that are crucial to the distinct biology of each species. LuxO is phosphorylated in response to low cell density, activating the transcription of a family of small RNAs called Qrrs, which in turn, control the levels of a global regulatory protein conserved within the Vibrionaceae. Although the function of each Qrr is similar, the number of qrr genes varies among the different species. Using a bioinformatics approach, we have determined the number of qrr genes in fully-sequenced Vibrionaceae members. Phylogenetic analysis suggests the most recent common ancestor of all Vibrionaceae shared a single, ancestral qrr gene, which duplicated and diverged into multiple qrr genes in some present-day vibrio lineages. To demonstrate that a single qrr gene is sufficient to mediate repression of LitR, the global regulator in Vibrio fischeri, we have performed a series of genetic and phenotypic analyses of the LuxO pathway and its output. Our studies contribute to a better understanding of the ancestral state of these pathways in vibrios, as well as to the evolution and divergence of other sRNAs within different bacterial lineages.
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