Identification of FleQ from Pseudomonas aeruginosa as a c-di-GMP-responsive transcription factor.

Identification of FleQ from Pseudomonas aeruginosa as a c-di-GMP-responsive transcription factor.
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DOI:
10.1111/j.1365-2958.2008.06281.x
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发表时间:
2008-07
影响因子:
3.6
通讯作者:
Harwood CS
Harwood CS
中科院分区:
生物学2区
文献类型:
--
作者:
Hickman JW;Harwood CS

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高水平的细胞内信号分子环二胍酸酯(c-di-GMP)抑制多种细菌的运动并激活胞外多糖(EPS)的产生。在许多细菌中,c-二gmp的部分作用是影响基因表达,但其作用机制尚不清楚。我们已经鉴定出FleQ蛋白是铜绿假单胞菌中c-di- gmp应答转录调节因子。FleQ可以激活鞭毛生物合成基因的表达。在这里,我们发现它还抑制包括参与EPS生物合成的pel操纵子在内的基因的转录,并且这种抑制被c-di-GMP缓解。我们的体内数据表明,FleQ抑制pel转录,而当细胞内c-di-GMP水平高时,pel转录不受抑制。FleQ的一种已知的抗激活剂FleN也参与控制pel的表达。在体外实验中,我们发现FleQ与pel启动子DNA结合,这种结合被c-di-GMP抑制。FleQ在体外结合放射性标记的c-二- gmp。FleQ不具有类似于先前定义的c-二gmp结合域的氨基酸基序。结果表明,FleQ是铜绿假单胞菌中控制EPS生物合成基因转录调控的新型c-di-GMP结合蛋白。
High levels of the intracellular signaling molecule cyclic diguanylate (c-di-GMP) supress motility and activate exopolysaccharide (EPS) production in a variety of bacterial species. In many bacteria part of the effect of c-di-GMP is on gene expression, but the mechanism involved is not known for any species. We have identified the protein FleQ as a c-di-GMP-responsive transcriptional regulator in Pseudomonas aeruginosa. FleQ is known to activate expression of flagella biosynthesis genes. Here we show that it also represses transcription of genes including the pel operon involved in EPS biosynthesis, and that this repression is relieved by c-di-GMP. Our in vivo data indicate that FleQ represses pel transcription and that pel transcription is not repressed when intracellular c-di-GMP levels are high. FleN, a known antiactivator of FleQ also participates in control of pel expression. In in vitro experiments we found that FleQ binds to pel promoter DNA and that this binding is inhibited by c-di-GMP. FleQ binds radiolabeled c-di-GMP in vitro. FleQ does not have amino acid motifs that resemble previously defined c-di-GMP binding domains. Our results show that FleQ is a new type of c-di-GMP binding protein that controls the transcriptional regulation of EPS biosynthesis genes in P. aeruginosa.
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