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- W1982121468 abstract "The bacterial tetracycline-resistance determinant from Tn 10 encodes a 43 kDa membrane protein, TetA, responsible for active efflux of tetracyclines. The tetA gene was cloned behind a T7 promoter/ac operator in a plasmid that provided fusion of TetA to a polyhis-tidine-carboxy terminal tail. A second plasmid provided a regulated T7 RNA polymerase. The specific activity of the TetA fusion protein was between 10–40% that of the wild-type protein as assayed by tetracycline resistance in cells and by transport in membrane vesicles. The fusion protein, overproduced approximately 3–13-fold, was purified by nickel chelation chromatography. Calculations from circular dichroism spectra of the purified protein solubilized in dodecylmaltoside gave an α-helix content of 54–64%, close to the 68% predicted from the amino acid sequence by hydropathy analysis (12 membrane-spanning helices) for the native protein in the membrane bilayer. Fluorescence studies showed binding activity of the purified protein to its substrate, the tetracycline analogue 13-(cyclopentylthio)-5-hydroxy-6-α-deoxyte-tracycline. These findings suggested that the purified protein was in a native state." @default.
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- W1982121468 date "1996-01-01" @default.
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- W1982121468 title "Purification of the Tn10-specified tetracycline efflux antiporter TetA in a native state as a polyhistidine fusion protein" @default.
- W1982121468 doi "https://doi.org/10.1046/j.1365-2958.1996.359886.x" @default.
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