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Gong T, Liu R, Che Y, Xu X, Zhao F, Yu H, Song C, Liu Y, Yang C. Engineering Pseudomonas putida KT2440 for simultaneous degradation of carbofuran and chlorpyrifos. Microb Biotechnol 2016; 9:792-800. [PMID: 27418102 PMCID: PMC5072195 DOI: 10.1111/1751-7915.12381] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Revised: 06/21/2016] [Accepted: 06/21/2016] [Indexed: 11/30/2022] Open
Abstract
Currently, chlorpyrifos (CP) and carbofuran are often applied together to control major agricultural pests in many developing countries, in most cases, they are simultaneously detected in agricultural soils. Some cost‐effective techniques are required for the remediation of combined pollution caused by multiple pesticides. In this work, we aim at constructing a detectable recombinant microorganism with the capacity to simultaneously degrade CP and carbofuran. To achieve this purpose, CP/carbofuran hydrolase genes and gfp were integrated into the chromosome of a biosafety strain Pseudomonas putida KT2440 using a chromosomal scarless modification strategy with upp as a counter‐selectable marker. The toxicity of the hydrolysis products was significantly lower compared with the parent compounds. The recombinant strain could utilize CP or carbofuran as the sole source of carbon for growth. The inoculation of the recombinant strain to soils treated with carbofuran and CP resulted in a higher degradation rate than in noninoculated soils. Introduced green fluorescent protein can be employed as a biomarker to track the recombinant strain during bioremediation. Therefore, the recombinant strain has potential to be applied for in situ bioremediation of soil co‐contaminated with carbofuran and CP.
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Affiliation(s)
- Ting Gong
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education and State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China
| | - Ruihua Liu
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education and State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China
| | - You Che
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education and State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China
| | - Xiaoqing Xu
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education and State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China
| | - Fengjie Zhao
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education and State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China
| | - Huilei Yu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Cunjiang Song
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education and State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China.
| | - Yanping Liu
- Department of Gynaecology and Obstetrics, Tianjin Medical University General Hospital, Tianjin, 300052, China.
| | - Chao Yang
- Key Laboratory of Molecular Microbiology and Technology for Ministry of Education and State Key Laboratory of Medicinal Chemical Biology, Nankai University, Tianjin, 300071, China.
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Aparicio T, Jensen SI, Nielsen AT, de Lorenzo V, Martínez-García E. The Ssr protein (T1E_1405) from Pseudomonas putida DOT-T1E enables oligonucleotide-based recombineering in platform strain P. putida EM42. Biotechnol J 2016; 11:1309-1319. [PMID: 27367544 DOI: 10.1002/biot.201600317] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 06/16/2016] [Accepted: 06/20/2016] [Indexed: 11/10/2022]
Abstract
Some strains of the soil bacterium Pseudomonas putida have become in recent years platforms of choice for hosting biotransformations of industrial interest. Despite availability of many genetic tools for this microorganism, genomic editing of the cell factory P. putida EM42 (a derivative of reference strain KT2440) is still a time-consuming endeavor. In this work we have investigated the in vivo activity of the Ssr protein encoded by the open reading frame T1E_1405 from Pseudomonas putida DOT-T1E, a plausible functional homologue of the β protein of the Red recombination system of λ phage of Escherichia coli. A test based on the phenotypes of pyrF mutants of P. putida (the yeast's URA3 ortholog) was developed for quantifying the ability of Ssr to promote invasion of the genomic DNA replication fork by synthetic oligonucleotides. The efficiency of the process was measured by monitoring the inheritance of the changes entered into pyrF by oligonucleotides bearing mutated sequences. Ssr fostered short and long genomic deletions/insertions at considerable frequencies as well as single-base swaps not affected by mismatch repair. These results not only demonstrate the feasibility of recombineering in P. putida, but they also enable a suite of multiplexed genomic manipulations in this biotechnologically important bacterium.
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Affiliation(s)
- Tomás Aparicio
- Systems Biology Program, National Center of Biotechnology CSIC, Madrid, Spain
| | - Sheila I Jensen
- The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Hørsholm, Denmark
| | - Alex T Nielsen
- The Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Hørsholm, Denmark
| | - Victor de Lorenzo
- Systems Biology Program, National Center of Biotechnology CSIC, Madrid, Spain.
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