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• W2946331451 abstract "Polycyclic aromatic hydrocarbons (PAHs) like phenanthrene are harmful to human health and are difficult to eliminate from environments. In this study, a phenanthrene degrading strain, Pseudomonas aeruginosa PH1, was isolated from oil-contaminated soil. An engineered co-culture consortium was subsequently constructed comprising two engineered bacterial strains, Escherichia coli HY1 and P. aeruginosa PH2, for use in phenanthrene bioremoval. E. coli HY1 harbored two modules of terminal dioxygenases and an electron transfer chain, while P. aeruginosa PH2 contained a module of catechol 1,2-dioxygenase. Phenanthrene removal rates by the wild-type degrader, P. aeruginosa PH1, were 45%, 43%, and 81%, in mineral salt medium supplemented with 100 mg/L phenanthrene, 100 mg/L phenanthrene and 2% (wt/vol) oil, and 100 mg/L phenanthrene and 2% (vol/vol) n-hexadecane, respectively. In contrast, the engineered co-culture consortium removed 71%, 80%, and 88% of the phenanthrene in the corresponding treatments, thus achieving much higher removal efficiencies. Moreover, gas chromatography-mass spectrometry confirmed that the engineered co-culture consortium first oxidized phenanthrene to 9,10-dihydroxy phenanthrene and 1,2-dihydroxy phenanthrene and then metabolized these intermediates via catechol to carbon dioxide and water. During this process, E. coli HY1 dominated the initial oxidation steps, while P. aeruginosa PH2 was primarily responsible for ring cleavage. These results indicate that the engineered co-culture consortium described here represents a potential alternative and attractive means to remove PAHs from natural environments." @default.
• W2946331451 created "2019-05-29" @default.
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• W2946331451 date "2019-08-01" @default.
• W2946331451 modified "2023-10-18" @default.
• W2946331451 title "Construction and analysis of an engineered Escherichia coli-Pseudomonas aeruginosa co-culture consortium for phenanthrene bioremoval" @default.
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• W2946331451 doi "https://doi.org/10.1016/j.bej.2019.05.010" @default.
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