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Potential for aerobic NO2 − reduction and corresponding key enzyme genes involved in Alcaligenes faecalis strain NR
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Potential for aerobic NO2 − reduction and corresponding key enzyme genes involved in Alcaligenes faecalis strain NR
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Journal Article
Potential for aerobic NO2 − reduction and corresponding key enzyme genes involved in Alcaligenes faecalis strain NR
2018
Overview
The potential for aerobic NO2− removal by Alcaligenes faecalis strain NR was investigated. 35 mg/L of NO2−-N was removed by strain NR under aerobic conditions in the presence of NH4+. 15N-labeling experiment demonstrated that N2O and N2 were possible products during the aerobic nitrite removal process by strain NR. The key enzyme genes of nirK, norB and nosZ, which regulate the aerobic nitrite denitrification process, were successfully amplified from strain NR. The gene sequence analysis indicates that copper-containing nitrite reductase (NIRK) and periplasmic nitrous oxide reductase (NOSZ) were both hydrophilic protein and the transmembrane structures were absent, while nitric oxide reductase large subunit (NORB) was a hydrophobic and transmembrane protein. According to the three-dimensional structure and binding site analysis, the bulky and hydrophobic methionine residue proximity to the nitrite binding sites of NIRK was speculated to be related to the oxygen tolerance of NIRK from strain NR.
Publisher
Springer Nature B.V
Subject
