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• W3135239320 abstract "Abstract Background The chloroacetamide herbicides pretilachlor is an emerging pollutant. Due to the large amount of use, its presence in the environment threatens human health. However, the molecular mechanism of pretilachlor degradation remains unknown. Results Now, Rhodococcus sp. B2 was isolated from rice field and shown to degrade pretilachlor. The maximum pretilachlor degradation efficiency (86.1%) was observed at a culture time of 5 d, an initial substrate concentration 50 mg/L, pH 6.98, and 30.1 °C. One novel metabolite N -hydroxyethyl-2-chloro- N -(2, 6-diethyl-phenyl)-acetamide was identified by gas chromatography-mass spectrometry (GC–MS). Draft genome comparison demonstrated that a 32,147-bp DNA fragment, harboring gene cluster ( EthRABCD B2 ), was absent from the mutant strain TB2 which could not degrade pretilachlor. The Eth gene cluster, encodes an AraC/XylS family transcriptional regulator (EthR B2 ), a ferredoxin reductase (EthA B2 ), a cytochrome P450 monooxygenase (EthB B2 ), a ferredoxin (EthC B2 ) and a 10-kDa protein of unknown function (EthD B2 ). Complementation with EthABCD B2 and EthABD B2 , but not EthABC B2 in strain TB2 restored its ability to degrade chloroacetamide herbicides. Subsequently, codon optimization of EthABCD B2 was performed, after which the optimized components were separately expressed in Escherichia coli , and purified using Ni-affinity chromatography. A mixture of EthABCD B2 or EthABD B2 but not EthABC B2 catalyzed the N- dealkoxymethylation of alachlor, acetochlor, butachlor, and propisochlor and O -dealkylation of pretilachlor, revealing that EthD B2 acted as a ferredoxin in strain B2. EthABD B2 displayed maximal activity at 30 °C and pH 7.5. Conclusions This is the first report of a P450 family oxygenase catalyzing the O -dealkylation and N- dealkoxymethylation of pretilachlor and propisochlor, respectively. And the results of the present study provide a microbial resource for the remediation of chloroacetamide herbicides-contaminated sites." @default.
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• W3135239320 date "2021-03-04" @default.
• W3135239320 modified "2023-10-16" @default.
• W3135239320 title "A bifunctional enzyme belonging to cytochrome P450 family involved in the O-dealkylation and N-dealkoxymethylation toward chloroacetanilide herbicides in Rhodococcus sp. B2" @default.
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• W3135239320 doi "https://doi.org/10.1186/s12934-021-01544-z" @default.
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