Abstract
A high-efficiency fluoranthene-degrading bacterium Paenibacillus sp. PRNK-6 was isolated from PAH-contaminated soil. The strain degrades 96% (240 mg l−1) of fluoranthene in 48 h. Various metabolic intermediates of fluoranthene catabolism were identified by gas chromatography (GC) and gas chromatography–high resolution mass spectrometry (GC-HRMS). Metabolite characterization, metabolite-feeding experiments, and appropriate enzyme activities in the cell-free extracts suggest the existence of a bifurcated pathway down the phthalic acid for complete mineralization of fluoranthene in PRNK-6. In this strain, fluoranthene catabolism begins by the attack on the fused aromatic ring portion of fluoranthene. Two terminal aromatic metabolites protocatechuate and catechol undergo ring cleavage by protocatechuate 3,4-dioxygenase and catechol 1,2-dioxygenase, respectively, and enter the central metabolism.
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Discover the latest articles, news and stories from top researchers in related subjects.Abbreviations
- PAHs:
-
Polycyclic aromatic hydrocarbons
- LMW:
-
Low molecular weight PAHs
- HMW:
-
High molecular weight PAHs
- US-EPA:
-
United States Environmental Protection Agency
- MSTFA:
-
N-Methyl-N- (trimethylsilyl)trifluoroacetamide
- TMS:
-
Trimethyl silane
- MSM:
-
Mineral salt medium
- GC:
-
Gas chromatography
- GC-HRMS:
-
Gas chromatography–high resolution mass spectrometry
- BLAST:
-
Basic Local Alignment Search Tool
- NCBI:
-
National Center for Biotechnology Information
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Acknowledgements
The authors wish to thank SAIF, Indian Institute of Technology Bombay, Powai, Mumbai, India, for the analysis of fluoranthene metabolites by GC-HRMS and the University Grants Commission (UGC), New Delhi, India, for financial support in the form of UGC-SAP programme [No. F. 4-27/2015/DRS-II (SAP-II)] sanctioned to the department. One of the authors, Pooja V. Reddy, acknowledges the UGC, New Delhi, for financial assistance through UGC-BSR Fellowship.
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Communicated by Matthias Boll.
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Reddy, P.V., Karegoudar, T.B., Monisha, T. et al. Biodegradation of fluoranthene by Paenibacillus sp. strain PRNK-6: a pathway for complete mineralization. Arch Microbiol 200, 171–182 (2018). https://doi.org/10.1007/s00203-017-1431-9
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DOI: https://doi.org/10.1007/s00203-017-1431-9