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. 2021 Feb 10;9:585617. doi: 10.3389/fbioe.2021.585617

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Copyright © 2021 Guo, Hui, Zhang, Liu, Li and Zheng.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Cadmium adsorption and biosensing by recombinant E. coli harboring three artificial cad operons. After exposure to 0–12.5 μM Cd(II) at 30^oC for 20 h, cadmium binding capacity, eGFP fluorescence intensity and β-galactosidase activity were determined separately. (A) TOP10/pPcad-CdBD and TOP10/pPcad-LOA (as control). (B) TOP10/pPcad-CdBD-GFP. (C) TOP10/pPcad-CdBD-GFP-lacZα. Fluorescence intensity and enzymatic activity values were normalized using the absorbance at 600 nm. The data were obtained by subtracting the value of recombinant E. coli with 0 μM Cd(II) exposure from that of each group. Data are mean ± SD from three independent assays each from three independent cultivations.