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• W2972773001 endingPage "124822" @default.
• W2972773001 startingPage "124822" @default.
• W2972773001 abstract "Arsenic (As) methylation is regarded as an efficient strategy for As contamination remediation by As volatilization. However, most microorganisms display low As volatilization efficiency, which is possibly linked to As efflux transporters competing for cytoplasmic As(III) as a substrate. Here, we developed two types of As biosensors in Escherichia coli to compare the As efflux rate of three efflux transporters and to further investigate the correlation between As efflux rates and As volatilization. The engineered As-sensitive E. coli AW3110 expressing arsBRP, acr3RP or arsBEC displayed a higher As resistance compared to the control. The fluorescence intensity was in a linear correlation in the range of 0-2.0 μmol/L of As(III). The intracellular As(III) concentration was negatively related to As efflux activity of As efflux transporter, which was consistent with the As resistance assays. Moreover, arsM derived from R. palustris CGA009 was subsequently introduced to construct an E. coli AW3110 co-expressing arsB/acr3 and arsM, which exhibited higher As(III) resistance, lower fluorescence intensity and intracellular As concentration compared to the engineered E. coli AW3110 expressing only arsB/acr3. The As volatilization efficiency was negatively related to As efflux activity of efflux transporters, the recombinants without arsB/acr3 displayed the highest rate of As volatilization. This study provided new insights into parameters affecting As volatilization with As efflux being the main limiting factor for As methylation and subsequent volatilization in many microorganisms." @default.
• W2972773001 created "2019-09-19" @default.
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• W2972773001 date "2020-01-01" @default.
• W2972773001 modified "2023-10-16" @default.
• W2972773001 title "ArsM-mediated arsenite volatilization is limited by efflux catalyzed by As efflux transporters" @default.
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• W2972773001 doi "https://doi.org/10.1016/j.chemosphere.2019.124822" @default.
• W2972773001 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31726527" @default.
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