FixK(2) Is the Main Transcriptional Activator of Bradyrhizobium diazoefficiens nosRZDYFLX Genes in Response to Low Oxygen.

FixK(2) Is the Main Transcriptional Activator of Bradyrhizobium diazoefficiens nosRZDYFLX Genes in Response to Low Oxygen.
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DOI:
10.3389/fmicb.2017.01621
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发表时间:
2017
影响因子:
5.2
通讯作者:
Delgado MJ
Delgado MJ
中科院分区:
生物学2区
文献类型:
--
作者:
Torres MJ;Bueno E;Jiménez-Leiva A;Cabrera JJ;Bedmar EJ;Mesa S;Delgado MJ

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强大的温室气体一氧化二氮(N2 O)具有推动气候变化的强大潜力。土壤是N2 O的主要来源,微生物硝化和反硝化是其主要过程。大豆内共生菌Bradyrhizobium diazoefficiens被认为是研究根瘤菌反硝化作用的模型,其依赖于napEDABC、nirK、norCBQD和nosRZDYFLX基因。在这种细菌中,调节级联FixLJ-FixK 2-NnrR在参与N2 O合成的napEDABC、nirK和norCBQD基因表达中的作用先前已被阐明。然而,关于呼吸N2 O还原酶(N2 OR)的调节仍有待发现,N2 OR是减轻N2 O排放的关键酶。在这项工作中,我们已经证明,nosRZDYFLX基因构成一个操纵子,它是从位于上游的nosR基因的主要启动子转录。低氧被证明是nosRZDYFLX基因表达和N2 OR活性的主要诱导物,FixK 2是参与这种控制的调节蛋白。此外,通过使用纯化的FixK 2蛋白和B.通过使用重氮效率RNA聚合酶,我们能够表明nosRZDYFLX基因是FixK 2的直接靶标。
The powerful greenhouse gas, nitrous oxide (N2O) has a strong potential to drive climate change. Soils are the major source of N2O and microbial nitrification and denitrification the main processes involved. The soybean endosymbiont Bradyrhizobium diazoefficiens is considered a model to study rhizobial denitrification, which depends on the napEDABC, nirK, norCBQD, and nosRZDYFLX genes. In this bacterium, the role of the regulatory cascade FixLJ-FixK2-NnrR in the expression of napEDABC, nirK, and norCBQD genes involved in N2O synthesis has been previously unraveled. However, much remains to be discovered regarding the regulation of the respiratory N2O reductase (N2OR), the key enzyme that mitigates N2O emissions. In this work, we have demonstrated that nosRZDYFLX genes constitute an operon which is transcribed from a major promoter located upstream of the nosR gene. Low oxygen was shown to be the main inducer of expression of nosRZDYFLX genes and N2OR activity, FixK2 being the regulatory protein involved in such control. Further, by using an in vitro transcription assay with purified FixK2 protein and B. diazoefficiens RNA polymerase we were able to show that the nosRZDYFLX genes are direct targets of FixK2.
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