Abstract
The interest of fluoroanilines in the environment is due to their extensive applications in industry and their low natural biodegradability. A pure bacterial strain capable of degrading 3-fluoroaniline (3-FA) as the sole source of carbon and energy was isolated from a sequencing batch reactor operating for the treatment of 3-FA. The strain (designated as JF-3) was identified by 16S rRNA gene analysis as a member of the genus Rhizobium. When grown in 3-FA medium at concentrations of 100–700 mg/L, strain JF-3 almost completely removed 3-FA within 72 h. However, the obvious cell growth inhibition was observed in cultures treated with 3-FA concentrations greater than 500 mg/L. The degradation kinetics of 3-FA were consistent with Haldane’s model with the maximum degradation rate as 67.66 mg/(g dry cell h). The growth kinetics of strain JF-3 followed Andrew’s model with the maximum growth rate as 30.87 h−1. Also, strain JF-3 was able to degrade 4-fluoroaniline, aniline, and catechol, but hardly grew on 2-fluoroaniline, 2,4-dfluoroaniline, 2,3,4-trifluoroaniline, 3-fluorocatechol, and 4-fluorocatechol. Additionally, it was able to grow over a wide pH range (pH 6–10), and also showed tolerance to salinity with lower than 1.0%. This result, in combination with the enzyme assays and analysis of metabolite intermediates, indicated an unconventional pathway for 3-fluoroaniline metabolism that involved conversion to 3-aminophenol and resorcinol by monooxygenase, and which was subsequently metabolized via the ortho-cleavage pathway. To our knowledge, this is the first report on the utilization of 3-FA as a growth substrate by Rhizobium sp.
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Acknowledgements
This work was partially supported by the National Natural Science Foundation of China (Nos. 21607092; 21476127; U1607119); the Public Technology Research Program of Zhejiang Province (Nos. GF18B060002; 2017C33012); the Talent Project of Quzhou University (Nos. XNZQN201506; BSJX201601).
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Zhao, ZQ., Zheng, TC., Zhang, WJ. et al. Degradation of 3-fluoroanilne by Rhizobium sp. JF-3. Biodegradation 30, 433–445 (2019). https://doi.org/10.1007/s10532-019-09885-8
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DOI: https://doi.org/10.1007/s10532-019-09885-8