Abstract
A bacterial strain using pyridine as sole carbon, nitrogen and energy source was isolated from the activated sludge of a coking wastewater treatment plant. By means of morphologic observation, physiological characteristics study and 16S rRNA gene sequence analysis, the strain was identified as the species of Paracoccus. The strain could degrade 2,614 mg l−1 of pyridine completely within 49.5 h. Experiment designed to track the metabolic pathway showed that pyridine ring was cleaved between the C2 and N, then the mineralization of the carbonous intermediate products may comply with the early proposed pathway and the transformation of the nitrogen may proceed on a new pathway of simultaneous heterotrophic nitrification and aerobic denitrification. During the degradation, NH3-N occurred and increased along with the decrease of pyridine in the solution; but the total nitrogen decreased steadily and equaled to the quantity of NH3-N when pyridine was degraded completely. Adding glucose into the medium as the extra carbon source would expedite the biodegradation of pyridine and the transformation of the nitrogen. The fragments of nirS gene and nosZ gene were amplified which implied that the BW001 had the potential abilities to reduce NO2 − to NO and/or N2O, and then to N2.
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Acknowledgements
This study was accomplished under an “863” Exploration Project (No. 2006AA06Z336) granted by the Chinese Ministry of Science and Technology and a Pre-exploration Project (No. 8073028) granted by the Natural Science Foundation of Beijing. The authors would like to express their appreciation to Prof. Yi Li, Mr. Mian Xia, Mr. Lin Qiao, Ms. Linying Wang, Ms. Xiaojin Cao, and Mr. Shengde Sha in the Beijing Weiming Kaituo Agro-biotechnology Ltd., for helping in the molecular biology.
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Bai, Y., Sun, Q., Zhao, C. et al. Microbial degradation and metabolic pathway of pyridine by a Paracoccus sp. strain BW001. Biodegradation 19, 915–926 (2008). https://doi.org/10.1007/s10532-008-9193-3
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DOI: https://doi.org/10.1007/s10532-008-9193-3