1
|
Zhu M, Su Y, Wang Y, Bo Y, Sun Y, Liu Q, Zhang H, Zhao C, Gu Y. Biodegradation characteristics of p-Chloroaniline and the mechanism of co-metabolism with aniline by Pseudomonas sp. CA-1. BIORESOURCE TECHNOLOGY 2024; 406:131086. [PMID: 38977036 DOI: 10.1016/j.biortech.2024.131086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 06/26/2024] [Accepted: 07/05/2024] [Indexed: 07/10/2024]
Abstract
Co-metabolism is a promising method to optimize the biodegradation of p-Chloroaniline (PCA). In this study, Pseudomonas sp. CA-1 could reduce 76.57 % of PCA (pH = 8, 70 mg/L), and 20 mg/L aniline as the co-substrate improved the degradation efficiency by 12.50 %. Further, the response and co-metabolism mechanism of CA-1 to PCA were elucidated. The results revealed that PCA caused deformation and damage on the surface of CA-1, and the -OH belonging to polysaccharides and proteins offered adsorption sites for the contact between CA-1 and PCA. Subsequently, PCA entered the cell through transporters and was degraded by various oxidoreductases accompanied by deamination, hydroxylation, and ring-cleavage reactions. Thus, the key metabolite 4-chlorocatechol was identified and two PCA degradation pathways were proposed. Besides, aniline further enhanced the antioxidant capacity of CA-1, stimulated the expression of catechol 2,3-dioxygenase and promoted meta-cleavage efficiency of PCA. The findings provide new insights into the treatment of PCA-aniline co-pollution.
Collapse
Affiliation(s)
- Mingjun Zhu
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Yuhua Su
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Yaru Wang
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Yonglin Bo
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Yufeng Sun
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Qiyou Liu
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China; State Key Laboratory of Petroleum Pollution Control, Qingdao 266580, PR China.
| | - Hang Zhang
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China
| | - Chaocheng Zhao
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China; State Key Laboratory of Petroleum Pollution Control, Qingdao 266580, PR China
| | - Yingying Gu
- College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, PR China; State Key Laboratory of Petroleum Pollution Control, Qingdao 266580, PR China
| |
Collapse
|
2
|
Suchana S, Araujo SP, Lomheim L, Mack EE, Spain JC, Edwards E, Passeport E. Compound-Specific Carbon, Nitrogen, and Hydrogen Isotope Analysis to Characterize Aerobic Biodegradation of 2,3-Dichloroaniline by a Mixed Enrichment Culture. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:12042-12050. [PMID: 38934904 DOI: 10.1021/acs.est.4c02173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/28/2024]
Abstract
Compound-specific isotope analysis (CSIA) is an established tool to track the in situ transformation of organic chemicals at contaminated sites. In this work, we evaluated the potential of multi-element CSIA to assess biodegradation of 2,3-dichloroaniline (2,3-DCA), which is a major industrial feedstock. Using controlled laboratory experiments, we determined, for the first time, negligible carbon (<0.5‰) and hydrogen (<10‰) isotope fractionation and a significant inverse nitrogen isotope fractionation (>10‰) during aerobic 2,3-DCA biodegradation by a mixed enrichment culture. The tentative identification of a glutamate conjugate of 2,3-DCA as a reaction intermediate indicates that the initial multistep enzymatic reaction may be rate-limiting. The formation of the glutamate adduct would increase the bond energy at the N atom, thus likely explaining the observed inverse N isotope fractionation. The corresponding nitrogen enrichment factor was +6.8 ± 0.6‰. This value was applied to investigate the in situ 2,3-DCA biodegradation at a contaminated site where the carbon and nitrogen isotope signatures from field samples suggested similar aerobic processes by native microorganisms. Under the assumption of the applicability of the Rayleigh model in a pilot wetland treating contaminated groundwater, the extent of biodegradation was estimated to be up to 80-90%. This study proposes multi-element CSIA as a novel application to study 2,3-DCA fate in groundwater and surface water and provides insights into biodegradation pathways.
Collapse
Affiliation(s)
- Shamsunnahar Suchana
- Department of Civil & Mineral Engineering, University of Toronto, 35 Saint George Street, Toronto, Ontario M5S 1A4, Canada
| | - Sofia Pimentel Araujo
- Department of Chemical Engineering & Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario M5S 3E5, Canada
| | - Line Lomheim
- Department of Chemical Engineering & Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario M5S 3E5, Canada
| | - E Erin Mack
- Corteva Remediation Group, Wilmington, Delaware 19805, United States
| | - Jim C Spain
- Center for Environmental Diagnostics and Bioremediation, University of West Florida, Pensacola, Florida 32514-5751, United States
| | - Elizabeth Edwards
- Department of Chemical Engineering & Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario M5S 3E5, Canada
| | - Elodie Passeport
- Department of Civil & Mineral Engineering, University of Toronto, 35 Saint George Street, Toronto, Ontario M5S 1A4, Canada
- Department of Chemical Engineering & Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario M5S 3E5, Canada
| |
Collapse
|
3
|
Li S, Geng Y, Bao C, Mei Q, Shi T, Ma X, Hua R, Fang L. Complete biodegradation of fungicide carboxin and its metabolite aniline by Delftia sp. HFL-1. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:168957. [PMID: 38030002 DOI: 10.1016/j.scitotenv.2023.168957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/26/2023] [Accepted: 11/26/2023] [Indexed: 12/01/2023]
Abstract
Fungicide carboxin was commonly used in the form of seed coating for the prevention of smut, wheat rust and cotton damping-off, leading carboxin and its probable carcinogenic metabolite aniline to directly enter the soil with the seeds, causing residual pollution. In this study, a novel carboxin degrading strain, Delftia sp. HFL-1, was isolated. Strain HFL-1 could use carboxin as the carbon source for growth and completely degrade 50 mg/L carboxin and its metabolite aniline within 24 h. The optimal temperatures and pH for carboxin degrading by strain HFL-1 were 30 to 42 °C and 5 to 9, respectively. Furthermore, the complete mineralization pathway of carboxin by strain HFL-1 was revealed by High Resolution Mass Spectrometer (HRMS). Carboxin was firstly hydrolyzed into aniline and further metabolized into catechol through multiple oxidation processes, and finally converted into 4-hydroxy-2-oxopentanoate, a precursor of the tricarboxylic acid cycle. Genome sequencing revealed the corresponding degradation genes and cluster of carboxin. Among them, amidohydrolase and dioxygenase were key enzymes involved in the degradation of carboxin and aniline. The discovery of transposons indicated that the aniline degradation gene cluster in strain HFL-1 was obtained via horizontal transfer. Furthermore, the degradation genes were cloned and overexpressed. The in vitro test showed that the expressed degrading enzyme could efficiently degrade aniline. This study provides an efficient strain resource for the bioremediation of carboxin and aniline in contaminated soil, and further revealing the molecular mechanism of biodegradation of carboxin and aniline.
Collapse
Affiliation(s)
- Shengyang Li
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Yuehan Geng
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Chengwei Bao
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Quyang Mei
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Taozhong Shi
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Xin Ma
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Rimao Hua
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China; Institute for Green Development, Anhui Agricultural University, Hefei, Anhui 230036, China
| | - Liancheng Fang
- Anhui Provincial Key Laboratory for Quality and Safety of Agri-Products, School of Resource & Environment, Anhui Agricultural University, Hefei, Anhui 230036, China; Institute for Green Development, Anhui Agricultural University, Hefei, Anhui 230036, China.
| |
Collapse
|
4
|
Liu Y, Okano K, Iwaki H. Identification and characterization of a pab gene cluster responsible for the 4-aminobenzoate degradation pathway, including its involvement in the formation of a γ-glutamylated intermediate in Paraburkholderia terrae strain KU-15. J Biosci Bioeng 2024; 137:38-46. [PMID: 37977976 DOI: 10.1016/j.jbiosc.2023.11.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 11/01/2023] [Accepted: 11/04/2023] [Indexed: 11/19/2023]
Abstract
Paraburkholderia terrae strain KU-15 grows on 2- and 4-nitrobenzoate and 2- and 4-aminobenzoate (ABA) as the sole nitrogen and carbon sources. The genes responsible for the potential degradation of 2- and 4-nitrobenzoate and 2-ABA have been predicted from its genome sequence. In this study, we identified the pab operon in P. terrae strain KU-15. This operon is responsible for the 4-ABA degradation pathway, which involves the formation of a γ-glutamylated intermediate. Reverse transcription-polymerase chain reaction revealed that the pab operon was induced by 4-ABA. Herein, studying the deletion of pabA and pabB1 in strain KU-15 and the examining of Escherichia coli expressing the pab operon revealed the involvement of the operon in 4-ABA degradation. The first step of the degradation pathway is the formation of a γ-glutamylated intermediate, whereby 4-ABA is converted to γ-glutamyl-4-carboxyanilide (γ-GCA). Subsequently, γ-GCA is oxidized to protocatechuate. Overexpression of various genes in E. coli and purification of recombinant proteins permitted the functional characterization of relevant pathway proteins: PabA is a γ-GCA synthetase, PabB1-B3 functions in a multicomponent dioxygenase system responsible for γ-GCA dioxygenation, and PabC is a γ-GCA hydrolase that reverses the formation of γ-GCA by PabA.
Collapse
Affiliation(s)
- Yaxuan Liu
- Department of Life Science & Biotechnology, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan
| | - Kenji Okano
- Department of Life Science & Biotechnology, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan
| | - Hiroaki Iwaki
- Department of Life Science & Biotechnology, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka 564-8680, Japan.
| |
Collapse
|
5
|
Yin Y, Zhang Q, Peng H. Retrospect and prospect of aerobic biodegradation of aniline: Overcome existing bottlenecks and follow future trends. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 330:117133. [PMID: 36584469 DOI: 10.1016/j.jenvman.2022.117133] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 12/17/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
Aniline is a highly bio-toxic industrial product, even at low concentrations, whose related wastewater has been flowing out worldwide on a large scale along with human production. As a green technology, aerobic biological treatment has been widely applied in industrial wastewater and exhibited various characteristics in the field of aniline wastewater. Meanwhile, this technology has shown its potential of synchronous nitrogen removal, but it still consumes energy badly. In the face of resource scarcity, this review comprehensively discusses the existing research in aerobic biodegradation of aniline wastewater to find out the developmental dawn of aerobic biological treatment. Primarily, it put forward the evolution history details of aniline biodegradation from pure culture to mixed culture and then to simultaneous nitrogen removal. On this basis, it presented the existing challenges to further expand the application of aerobic biotechnology, including the confusions of aniline metabolic mechanism, the development of co-degradation of multiple pollutants and the lack of practical experience of bioreactor operation for aniline and nitrogen removal. Additionally, the prospects of the technological shift to meet the needs of an energy-conserving society was described according to existing experiences and feasibility. Including but not limiting to the development of multifunctional bacteria, the reduction of greenhouse gases and the combination of green technologies.
Collapse
Affiliation(s)
- Yixin Yin
- School of Resources & Environmental Engineering, Wuhan University of Technology, Wuhan, Hubei, 430070, China
| | - Qian Zhang
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan, 430070, China.
| | - Haojin Peng
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| |
Collapse
|
6
|
Cheng M, Chen D, Parales RE, Jiang J. Oxygenases as Powerful Weapons in the Microbial Degradation of Pesticides. Annu Rev Microbiol 2022; 76:325-348. [PMID: 35650666 DOI: 10.1146/annurev-micro-041320-091758] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Oxygenases, which catalyze the reductive activation of O2 and incorporation of oxygen atoms into substrates, are widely distributed in aerobes. They function by switching the redox states of essential cofactors that include flavin, heme iron, Rieske non-heme iron, and Fe(II)/α-ketoglutarate. This review summarizes the catalytic features of flavin-dependent monooxygenases, heme iron-dependent cytochrome P450 monooxygenases, Rieske non-heme iron-dependent oxygenases, Fe(II)/α-ketoglutarate-dependent dioxygenases, and ring-cleavage dioxygenases, which are commonly involved in pesticide degradation. Heteroatom release (hydroxylation-coupled hetero group release), aromatic/heterocyclic ring hydroxylation to form ring-cleavage substrates, and ring cleavage are the main chemical fates of pesticides catalyzed by these oxygenases. The diversity of oxygenases, specificities for electron transport components, and potential applications of oxygenases are also discussed. This article summarizes our current understanding of the catalytic mechanisms of oxygenases and a framework for distinguishing the roles of oxygenases in pesticide degradation. Expected final online publication date for the Annual Review of Microbiology, Volume 76 is September 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
Collapse
Affiliation(s)
- Minggen Cheng
- Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture and Rural Affairs and Department of Microbiology, College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, China;
| | - Dian Chen
- State Key Laboratory of Microbial Metabolism, School of Life Science and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Rebecca E Parales
- Department of Microbiology and Molecular Genetics, College of Biological Sciences, University of California, Davis, California, USA
| | - Jiandong Jiang
- Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture and Rural Affairs and Department of Microbiology, College of Life Sciences, Nanjing Agricultural University, Nanjing, Jiangsu, China;
| |
Collapse
|
7
|
Characterization of the 2,6-Dimethylphenol Monooxygenase MpdAB and Evaluation of Its Potential in Vitamin E Precursor Synthesis. Appl Environ Microbiol 2022; 88:e0011022. [PMID: 35380460 DOI: 10.1128/aem.00110-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
2,6-Dimethylphenol (2,6-DMP) is a widely used chemical intermediate whose residue has been frequently detected in the environment, posing a threat to some aquatic organisms. Microbial degradation is an effective method to eliminate 2,6-DMP in nature. However, the genetic and biochemical mechanisms of 2,6-DMP metabolism remain unknown. Mycobacterium neoaurum B5-4 is a 2,6-DMP-degrading bacterium isolated in our previous study. Here, a 2,6-DMP degradation-deficient mutant of strain B5-4 was screened. Comparative genomic, transcriptomic, gene disruption, and genetic complementation data indicated that mpdA and mpdB are responsible for the initial step of 2,6-DMP degradation in M. neoaurum B5-4. MpdAB was predicted to be a two-component flavin-dependent monooxygenase system, which shows 32% and 36% identities with HsaAB from Mycobacterium tuberculosis CDC1551. The transcription of mpdA and mpdB was substantially increased upon exposure to 2,6-DMP. Nuclear magnetic resonance analysis showed that purified 6×His-MpdA and 6×His-MpdB hydroxylated 2,6-DMP and 2,3,6-trimethylphenol (2,3,6-TMP) at the para-position using NADH and flavin adenine dinucleotide (FAD) as cofactors. The apparent Km values of MpdAB for 2,6-DMP and 2,3,6-TMP were 0.12 ± 0.01 and 0.17 ± 0.01 mM, respectively, and the corresponding kcat/Km values were 4.02 and 2.84 s-1 mM-1, respectively. Since para-hydroxylated 2,3,6-TMP is a major precursor for vitamin E synthesis, the potential of MpdAB in vitamin E synthesis was preliminarily evaluated using whole-cell catalysis. Low expression levels of MpdA and 2,3,6-TMP cytotoxicity limited the efficiency of whole-cell catalysis. Together, this study reveals the genetic and biochemical basis for the initial step of 2,6-DMP biodegradation and provides candidate enzymes for vitamin E synthesis. IMPORTANCE Although the microbial degradation of the six isomers of dimethylphenol has been extensively studied, the genetic and biochemical mechanisms of 2,6-DMP degradation remain unclear. This study identified the genes responsible for the initial step in the 2,6-DMP catabolic pathway in M. neoaurum B5-4. Moreover, MpdAB also catalyzed the transformation of 2,3,6-TMP to 2,3,5-trimethylhydroquinone (2,3,5-TMHQ), a crucial step in vitamin E synthesis. Overall, this study provides candidate enzymes for both the bioremediation of 2,6-DMP contamination and the development of a green method to synthesize vitamin E.
Collapse
|
8
|
Yang Y, Zhang ZW, Liu RX, Ju HY, Bian XK, Zhang WZ, Zhang CB, Yang T, Guo B, Xiao CL, Bai H, Lu WY. Research progress in bioremediation of petroleum pollution. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:46877-46893. [PMID: 34254241 DOI: 10.1007/s11356-021-15310-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 07/01/2021] [Indexed: 06/13/2023]
Abstract
With the enhancement of environmental protection awareness, research on the bioremediation of petroleum hydrocarbon environmental pollution has intensified. Bioremediation has received more attention due to its high efficiency, environmentally friendly by-products, and low cost compared with the commonly used physical and chemical restoration methods. In recent years, bacterium engineered by systems biology strategies have achieved biodegrading of many types of petroleum pollutants. Those successful cases show that systems biology has great potential in strengthening petroleum pollutant degradation bacterium and accelerating bioremediation. Systems biology represented by metabolic engineering, enzyme engineering, omics technology, etc., developed rapidly in the twentieth century. Optimizing the metabolic network of petroleum hydrocarbon degrading bacterium could achieve more concise and precise bioremediation by metabolic engineering strategies; biocatalysts with more stable and excellent catalytic activity could accelerate the process of biodegradation by enzyme engineering; omics technology not only could provide more optional components for constructions of engineered bacterium, but also could obtain the structure and composition of the microbial community in polluted environments. Comprehensive microbial community information lays a certain theoretical foundation for the construction of artificial mixed microbial communities for bioremediation of petroleum pollution. This article reviews the application of systems biology in the enforce of petroleum hydrocarbon degradation bacteria and the construction of a hybrid-microbial degradation system. Then the challenges encountered in the process and the application prospects of bioremediation are discussed. Finally, we provide certain guidance for the bioremediation of petroleum hydrocarbon-polluted environment.
Collapse
Affiliation(s)
- Yong Yang
- School of Chemical Engineering and Technology, Tianjin University, No.135, Ya Guan Rd, Jinnan District, Tianjin, 300350, China
- CNOOC EnerTech-Safety & Environmental Protection Co., Tianwei Industrial Park, No. 75 Taihua Rd, TEDA, Tianjin, 300457, China
| | - Zhan-Wei Zhang
- School of Chemical Engineering and Technology, Tianjin University, No.135, Ya Guan Rd, Jinnan District, Tianjin, 300350, China
| | - Rui-Xia Liu
- School of Chemical Engineering and Technology, Tianjin University, No.135, Ya Guan Rd, Jinnan District, Tianjin, 300350, China
| | - Hai-Yan Ju
- School of Chemical Engineering and Technology, Tianjin University, No.135, Ya Guan Rd, Jinnan District, Tianjin, 300350, China
| | - Xue-Ke Bian
- School of Chemical Engineering and Technology, Tianjin University, No.135, Ya Guan Rd, Jinnan District, Tianjin, 300350, China
| | - Wan-Ze Zhang
- School of Chemical Engineering and Technology, Tianjin University, No.135, Ya Guan Rd, Jinnan District, Tianjin, 300350, China
| | - Chuan-Bo Zhang
- School of Chemical Engineering and Technology, Tianjin University, No.135, Ya Guan Rd, Jinnan District, Tianjin, 300350, China
| | - Ting Yang
- CNOOC EnerTech-Safety & Environmental Protection Co., Tianwei Industrial Park, No. 75 Taihua Rd, TEDA, Tianjin, 300457, China
| | - Bing Guo
- CNOOC EnerTech-Safety & Environmental Protection Co., Tianwei Industrial Park, No. 75 Taihua Rd, TEDA, Tianjin, 300457, China
| | - Chen-Lei Xiao
- CNOOC EnerTech-Safety & Environmental Protection Co., Tianwei Industrial Park, No. 75 Taihua Rd, TEDA, Tianjin, 300457, China
| | - He Bai
- China Offshore Environmental Service Ltd., Tianwei Industrial Park, No. 75 Taihua Rd, TEDA, Tianjin, 300457, China.
- Tianjin Huakan Environmental Protection Technology Co. Ltd., No. 67 Guangrui West Rd, Hedong District, Tianjin, 300170, China.
| | - Wen-Yu Lu
- School of Chemical Engineering and Technology, Tianjin University, No.135, Ya Guan Rd, Jinnan District, Tianjin, 300350, China.
| |
Collapse
|
9
|
Zang H, Wang H, Miao L, Cheng Y, Zhang Y, Liu Y, Sun S, Wang Y, Li C. Carboxylesterase, a de-esterification enzyme, catalyzes the degradation of chlorimuron-ethyl in Rhodococcus erythropolis D310-1. JOURNAL OF HAZARDOUS MATERIALS 2020; 387:121684. [PMID: 31784128 DOI: 10.1016/j.jhazmat.2019.121684] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 11/10/2019] [Accepted: 11/11/2019] [Indexed: 06/10/2023]
Abstract
Microbial degradation is considered to be the most acceptable method for degradation of chlorimuron-ethyl, a typical long-term residual sulfonylurea herbicide, but the underlying mechanism at the genetic and biochemical levels is unclear. In this work, the genome sequence of the chlorimuron-ethyl-degrading bacterium Rhodococcus erythropolis D310-1 was completed, and the gene clusters responsible for the degradation of chlorimuron-ethyl in D310-1 were predicted. A carboxylesterase gene, carE, suggested to be responsible for carboxylesterase de-esterification, was cloned from D310-1. CarE was expressed in Escherichia coli BL21 and purified to homogeneity. The active site of the chlorimuron-ethyl-degrading enzyme CarE and the biochemical activities of CarE were elucidated. The results demonstrated that CarE is involved in catalyzing the de-esterification of chlorimuron-ethyl. A carE deletion mutant strain, D310-1ΔcarE, was constructed, and the chlorimuron-ethyl degradation rate in the presence of 100 mg L-1 chlorimuron-ethyl within 120 h decreased from 86.5 % (wild-type strain D310-1) to 58.2 % (mutant strain D310-1ΔcarE). Introduction of the plasmid pNit-carE restored the ability of the mutant strain to utilize chlorimuron-ethyl. This study is the first to demonstrate that carboxylesterase can catalyze the de-esterification reaction of chlorimuron-ethyl and provides new insights into the mechanism underlying the degradation of sulfonylurea herbicides and a theoretical basis for the utilization of enzyme resources.
Collapse
Affiliation(s)
- Hailian Zang
- College of Resource and Environment, Northeast Agricultural University, Harbin, 150030, Heilongjiang, PR China
| | - Hailan Wang
- College of Resource and Environment, Northeast Agricultural University, Harbin, 150030, Heilongjiang, PR China
| | - Lei Miao
- College of Resource and Environment, Northeast Agricultural University, Harbin, 150030, Heilongjiang, PR China
| | - Yi Cheng
- College of Science, China Agricultural University, Beijing, 100083, PR China
| | - Yuting Zhang
- College of Resource and Environment, Northeast Agricultural University, Harbin, 150030, Heilongjiang, PR China
| | - Yi Liu
- College of Resource and Environment, Northeast Agricultural University, Harbin, 150030, Heilongjiang, PR China
| | - Shanshan Sun
- College of Resource and Environment, Northeast Agricultural University, Harbin, 150030, Heilongjiang, PR China
| | - Yue Wang
- College of Resource and Environment, Northeast Agricultural University, Harbin, 150030, Heilongjiang, PR China
| | - Chunyan Li
- College of Resource and Environment, Northeast Agricultural University, Harbin, 150030, Heilongjiang, PR China.
| |
Collapse
|