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- W2952199493 abstract "We characterized the metal tolerance of recombinant strains harboring metallothionein from the freshwater crab Sinopotamon henanense (ShMT) in vivo and metal binding properties of ShMT purified in vitro. The recombinant strains harboring ShMT were exposed to 0.1 mM Cd2+, 0.3 mM Cu2+, 0.5 mM Pb2+, and 0.8 mM Zn2+. The growth curves and spot assays of recombinant strains and the contents of heavy metal ions were analysed in the media supplemented with above metal ions provided to recombinant E. coli synthesis. The structural characteristics of the Cd-, Cu-, Pb-, and Zn-ShMT were determined through ultraviolet spectroscopy (UV-vis), circular dichroism (CD), and isothermal titration calorimetry (ITC). The in vivo results showed that, compared to control strains, recombinant strains tolerated Cd2+, Cu2+, Pb2+, and Zn2+. Furthermore, the contents of Cd2+ and Pb2+ in media decreased substantially. In vitro and the Cd-ShMT had a higher degree of folding compactness in solution. 5,5'-Dithiobis-(2-nitrobenzoic) acid (DTNB) reaction and ITC results demonstrated that ShMT yielded Cd6-, Cu7-, and Pb6-ShMT. The binding stability order was Cu-ShMT > Cd-ShMT > Pb-ShMT > Zn-ShMT. Overall, ShMT is a canonical crustacean MT and is defined as a Cd-specific MT isoform that functions mainly in a detoxifying Cd2+ and Pb2+ and in regulating Zn2+ homeostasis in S. henanense. This research on the metal binding properties of ShMT provides a better understanding of the physiological function of ShMT reducing heavy metal bioavailability and by regulating essential trace metals." @default.
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- W2952199493 date "2019-11-01" @default.
- W2952199493 modified "2023-09-29" @default.
- W2952199493 title "Metal binding characterization of heterologously expressed metallothionein of the freshwater crab Sinopotamon henanense" @default.
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- W2952199493 doi "https://doi.org/10.1016/j.chemosphere.2019.06.097" @default.
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