Biodegradation of tylosin in swine wastewater by Providencia stuartii TYL-Y13: Performance, pathway, genetic background, and risk assessment
文献类型： 外文期刊
作者： Yang, Jian 1 ; Zhao, Zhuo-qun 1 ; Wang, Min 1 ; Yu, Ke-fei 1 ; Zhang, Tao 1 ; Lin, Hui 2 ; Zheng, Hua-bao 1 ;
作者机构： 1.Zhejiang A&F Univ, Coll Environm & Resources Sci, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou 311300, Peoples R China
2.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizers, State Key Lab Managing Biot & Chem Threats Qual &, Hangzhou 310021, Peoples R China
关键词： Biodegradation; Degradation pathway; Swine wastewater; ARGs
期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）
ISSN： 0304-3894
年卷期： 2022 年 440 卷
页码：
收录情况： SCI
摘要： Microbial bioremediation offers a solution to the problem of residual antibiotics in wastewater associated with animal farms. Efficient degradation of antibiotic residues depends upon the genetic make-up of microbial degraders, which requires a comprehensive understanding of the degradation mechanisms. In this study, a novel, efficient tylosin (TYL)-degrading bacterium, Providencia stuartii TYL-Y13 (Y13) was isolated, which could completely degrade 100 mg/L TYL within 15 h under optimal operating conditions at 40 degrees C, pH 7.0 %, and 1 % (v/v) bacterial inoculation rate. Whole genome sequencing revealed that strain Y13 consists of a circular chromosome and two plasmids. A new biodegradation pathway of TYL including desugarification, hydrolysis, and reduction reactions was proposed through the analysis of biodegradation products. It was demonstrated that strain Y13 gradually decreased the biotoxicity of TYL and its metabolites based on the results of the ecological structural activity relationships (ECOSAR) model analysis and toxicity assessment. Moreover, Y13 promoted the reduction of the target macrolide resistance genes in wastewater and disappeared within 84 h. These results shed new light on the mechanism of TYL biodegradation and better utilization of microbes to remediate TYL contamination.
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