Antitoxin DinJ influences the general stress response through transcript stabilizer CspE.

Antitoxin DinJ influences the general stress response through transcript stabilizer CspE.
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DOI:
10.1111/j.1462-2920.2011.02618.x
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发表时间:
2012-03
影响因子:
5.1
通讯作者:
Wood TK
Wood TK
中科院分区:
生物学2区
文献类型:
--
作者:
Hu Y;Benedik MJ;Wood TK

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抗毒素正逐渐被认为是一种蛋白质,它不仅能调节自身的合成;例如,我们之前发现大肠杆菌毒素/抗毒素(TA)对MqsR/MqsA的抗毒素MqsA直接抑制编码固定期sigma因子RpoS的基因。在此,我们研究了YafQ/DinJ - TA对抗毒素DinJ的生理作用,发现DinJ还通过降低RpoS水平影响一般应激反应。RpoS调节的过氧化氢酶活性、细胞粘附素和环双胍酸盐表型随着游泳的增加而降低,证实了生成DinJ时RpoS水平的降低。通过转录组搜索和dna结合分析,我们确定了DinJ降低RpoS的机制是通过抑制LexA回文位点的cspE;冷休克蛋白CspE促进rpoS mRNA的翻译。CspE的失活消除了DinJ影响RpoS的能力。因此,DinJ通过调节cspE间接影响一般的应激反应。
Antitoxins are becoming recognized as proteins that regulate more than their own synthesis; for example, we found previously that antitoxin MqsA of the Escherichia coli toxin/antitoxin (TA) pair MqsR/MqsA directly represses the gene encoding the stationary-phase sigma factor RpoS. Here, we investigated the physiological role of antitoxin DinJ of the YafQ/DinJ TA pair and found DinJ also affects the general stress response by decreasing RpoS levels. Corroborating the reduced RpoS levels upon producing DinJ, the RpoS-regulated phenotypes of catalase activity, cell adhesins and cyclic diguanylate decreased while swimming increased. Using a transcriptome search and DNA-binding assays, we determined that the mechanism by which DinJ reduces RpoS is by repressing cspE at the LexA palindrome; cold-shock protein CspE enhances translation of rpoS mRNA. Inactivation of CspE abolishes the ability of DinJ to influence RpoS. Hence, DinJ influences the general stress response indirectly by regulating cspE.
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