Further characterization of o-nitrobenzaldehyde degrading bacterium Pseudomonas sp: ONBA-17 and deduction on its metabolic pathway

Brazilian Journal of Microbiology

Fang-bo Yu²  Xiao-dan Li¹  Shinawar Waseem Ali¹  Sheng-dao Shan²  Lin-ping Luo²  Li-bo Guan² 

[1] ,Zhejiang Agricultural and Forestry University Department of Environmental Sciences Linan,China

关键词: Pseudomonas putida;    biodegradation;    metabolic pathway;    nitroaromatics;   

DOI  :  10.1590/S1517-83822014000400021

来源: SciELO

【 摘 要 】

A previously reported o-nitrobenzaldehyde (ONBA) degrading bacterium Pseudomonas sp. ONBA-17 was further identified and characterized. Based on results of DNA base composition and DNA-DNA hybridization, the strain was identified as P. putida. Its degradation effect enhanced with increase of inoculum amount and no lag phase was observed. Higher removal rate was achieved under shaking conditions. All tested ONBA with different initial concentrations could be completely degraded within 5 d. In addition, degradative enzyme(s) involved was confirmed as intra-cellular distributed and constitutively expressed. Effects of different compounds on relative activity of degradative enzyme(s) within cell-free extract were also evaluated. Finally, 2-nitrobenzoic acid and 2, 3-dihydroxybenzoic acid were detected as metabolites of ONBA degradation by P. putida ONBA-17, and relevant metabolic pathway was preliminary proposed. This study might help with future research in better understanding of nitroaromatics biodegradation.

【 授权许可】

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