Abstract
Nicotine in tobacco is harmful to health and the environment, so there is an environmental requirement to remove nicotine from tobacco and tobacco wastes. In this study, the biotransformation of nicotine by Rhodococcus sp. Y22 was investigated, and three metabolites (NIC1, NIC4 and NIC5) were isolated by column separation, preparative TLC and solid plate’s method, respectively. NIC1 was identified as 6-hydoxynicotine based on the results of NMR, MS, HPLC–UV and HRESIMS analysis; NIC4 was a novel compound and identified as 5-(3-methyl-[1,3]oxazinan-2-ylidene)-5H-pyridin-2-one based on the results of NMR, MS and UV analysis; NIC5 was identified as nicotine blue based on the results of NMR and MS analysis. Meanwhile, two metabolites NIC2 and NIC3 were identified as 6-hydroxy-N-methylmyosmine and 6-hydroxypseudooxynicotine by HRESIMS analysis, respectively. According to these metabolites, the possible pathway of nicotine degradation by Rhodococcus sp. Y22 was proposed. The nicotine can be transformed to nicotine blue through two pathways (A and B), and 6-hydroxy-N-methylmyosmine is the key compound, which can be converted to 6-hydroxypseudooxynicotine (pathway A) and 5-(3-methyl-[1,3]oxazinan-2-ylidene)-5H-pyridin-2-one (pathway B), respectively. Moreover, the encoding gene of nicotine dehydrogenase, ndh, was amplified from Rhodococcus sp. Y22, and its transcriptional level could be up-regulated obviously under nicotine induction. Our studies reported the key metabolites and possible biotransformation pathway of nicotine in Rhodococcus sp. Y22, and provided new insights into the microbial metabolism of nicotine.
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Acknowledgments
We are grateful to Prof. Chang Sun of the College of Life Science, Shaanxi Normal University, for valuable comments and critical discussions. This work was supported by the National Natural Science Foundation of China (31060012), the Program for Excellent Young Talents of Yunnan University (To Jinkui Yang), the key Project of China National Tobacco Corporation [110201401017 (XX-05)], and the Basic Research Foundation of Yunnan Tobacco Industry Co. Ltd. (2015CP06).
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Gong, X., Ma, G., Duan, Y. et al. Biodegradation and metabolic pathway of nicotine in Rhodococcus sp. Y22. World J Microbiol Biotechnol 32, 188 (2016). https://doi.org/10.1007/s11274-016-2147-8
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DOI: https://doi.org/10.1007/s11274-016-2147-8