Abstract
Considerable efforts that isolate and characterize degrading bacteria for polycyclic aromatic hydrocarbons (PAHs) have focused on contaminated environments so far. Here we isolated three distinctive pyrene (PYR)-degrading bacteria from a paddy soil that was not contaminated with PAHs. These included a novel Bacillus sp. PyB-9 and efficient degraders, Shigella sp. PyB-6 and Agromyces sp. PyB-10. All three strains could utilize naphthalene, phenanthrene, anthracene, fluoranthene and PYR as sole carbon sources, and degraded PYR in a range of temperatures (27–37 °C) and pH (5–8). Strains PyB-6 and PyB-10 almost completely degraded 50 mg L−1 PYR within 15 days, and 75.5% and 98.9% of 100 mg L−1 PYR in 27 days, respectively. The kinetics of PYR biodegradation was well represented by the Gompertz model. Ten and twelve PYR metabolites were identified in PYR degradation process by strains PyB-6 and PyB-10, respectively. Chemical analyses demonstrated that the degradation mechanisms of PYR were the same for strains PyB-6 and PyB-10 with initial dioxygenation mainly on C-4,5 positions of PYR. The degradation of 4,5-phenanthrenedicarboxylic acid was branched to 4-phenanthrenecarboxylic acid pathway and 5-hydroxy-4-phenanthrenecarboxylic acid pathway, both of which played important roles in PYR degradation by strains PyB-6 and PyB-10. To our knowledge, Shigella sp. and Agromyces sp. were found for the first time to possess the capability for PAHs degradation. These findings contributed to upgrading the bank of microbial resource and knowledge on PAH biodegradation.
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Acknowledgements
The authors are grateful to the financial support by the National Natural Science Foundation of China (42077130, 40971265).
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Funding was provided by National Natural Science Foundation of China (Grant No. 42077130, 40971265).
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SS: Writing-original draft, Formal analysis, Investigation. RW: Conceptualization, Writing-review and editing. SH: Investigation, Methodology. MY: Data curation, Validation. JN: Writing-review and editing, Supervision, Funding acquisition.
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Sun, S., Wei, R., Hu, S. et al. Isolation and characterization of distinctive pyrene-degrading bacteria from an uncontaminated soil. Biodegradation (2024). https://doi.org/10.1007/s10532-023-10065-y
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DOI: https://doi.org/10.1007/s10532-023-10065-y