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An integrated method for studying the biodegradation of benzo[a]pyrene by Citrobacter sp. HJS-1 and interaction mechanism based on the structural model of the initial dioxygenase

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Abstract

A bacterial strain Citrobacter sp. HJS-1 was discovered from the sludge in a drainage canal of a coal mine. Firstly, its biodegradation capacity for benzo[a]pyrene (BaP) was detected under different concentrations. The results proved that the strain possessed excellent biodegradation capacity for BaP with high-efficiency degradation rates ranging from 78.9 to 86.8%. The highest degradation rate was observed in the low-concentration sample, and the high-concentration BaP had a slight influence on the biodegradation capacity due to the potential toxicity of BaP and its oxygen-containing derivatives. Meanwhile, the degradation test for the other five aromatic hydrocarbons (2- to 4-ring) proved that the strain had a comprehensive degradation potential. To clarify the biodegradation mechanism of BaP, a dioxygenase structure was constructed by homology modeling. Then, the interactions between dioxygenase and BaP were researched by molecular simulation. Combined with the identification of the vital BaP-cis-7,8-dihydrodiol intermediate and the interaction analysis, the initial oxidation mode and the binding site of BaP were revealed in the dioxygenase. Taken together, this study has offered a way to understand the biodegradation process of BaP and its interaction mechanism based on experimental and theoretical analysis.

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Acknowledgements

We thank Henan University of Technology for support of the experimental site, and all funds for their support of the study.

Funding

This work was supported by grants from the National Natural Science Foundation of China (No. 41907302), the Fundamental Research Funds for the Henan Provincial Colleges and Universities in Henan University of Technology (No. 2018QNJH10), the Doctoral Scientific Research Start-up Foundation from Henan University of Technology (No. 2017BS027), and the Training Program for Young Backbone Teachers of Henan University of Technology (No. 21420112).

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Jingnan Jin: methodology, conceptualization, funding acquisition, visualization, formal analysis, project administration, writing—original draft. Yahui Shi, Baozhong Zhang, and Dongjin Wan: resources, investigation, data curation, formal analysis, writing—review and editing. Qingye Zhang: software, visualization.

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Correspondence to Jingnan Jin.

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The authors declare no competing interests.

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Highlights

• Citrobacter sp. HJS-1 was first applied in benzo[a]pyrene-degrading process.

• Benzo[a]pyrene-cis-7,8-dihydrodiol was determined as a key intermediate.

• Homology modeling technology was used to construct the target dioxygenase.

• A degradation pathway of benzo[a]pyrene was proposed in the strain HJS-1.

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Jin, ., Shi, Y., Zhang, B. et al. An integrated method for studying the biodegradation of benzo[a]pyrene by Citrobacter sp. HJS-1 and interaction mechanism based on the structural model of the initial dioxygenase. Environ Sci Pollut Res 30, 85558–85568 (2023). https://doi.org/10.1007/s11356-023-28505-w

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  • DOI: https://doi.org/10.1007/s11356-023-28505-w

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