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Characteristics of Escherichia coli HB101 and Pseudomonas putida PpY101 harboring a recombinant plasmid with tandem insertion of the mercury resistance operon. 1997
National Institute for Environmental Studies, Ibaraki, Japan.
We constructed the plasmid pSUPmer2 by inserting tandem copies of the mercury resistance (mer) operon into a broad host range-vector, and introduced it into Escherichia coli HB101 and Pseudomonas putida PpY101 to increase their mercury resistance. Strains harboring plasmid pSUPmer2 had higher mercury resistance and mercuric reductase activity than those strains harboring the plasmid pSUPmer which had one copy of the mer operon. Mercury resistance of P. putida PpY101 was significantly increased by tandem insertion of the mer operon.
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