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Jin, Peng; Chen, Yinyan; Yao, Rui; Zheng, Zhanwang; Du, Qizhen
Journal of hazardous materials, 06/2019, Letnik: 371Journal Article
Display omitted •The genes involving in nitrogen metabolism were identified from draft genome.•The change levels of pathway genes under organic and inorganic N were investigated.•Three types of nitrate reductase are present in SND strain Klebsiella sp. KSND.•Hydroxylamine reductase showed activity in NH2OH to generate NH4+. Here, the draft genome of simultaneous nitrification-denitrification strain (SND) Klebsiella sp. KSND revealed possible existence of genes involved in N-assimilation and -dissimilation pathways. The change levels of genes under defined N-sources were analyzed by Quantitative Real-Time PCR. It suggested that NH4+-assimilation via NADP-glutamate dehydrogenase pathway would occur preferentially. NirBD genes were tightly regulated in a lower level, so that nitrite was rapidly consumed for detoxication by denitrification. Three types of nitrate reductase homologues are surprisingly present in KSND, whereas the dominant nitrate reduction for assimilation and denitrification processes mediates by NapA-type nitrate reductase. Nitric oxide reductase homologues FlRd and FlRd-red provide an adequate capacity for NO detoxification. The recombinant hydroxylamine reductase showed high activity in hydroxylamine to generate ammonium, which might contribute to detoxification mechanism in nitrogen cycling. Overall, this study firstly provides valuable insights into the genes expression and enzyme action, which helps understanding the mechanism of SND processes.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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