Abstract
Three separate plasmids of 6, 7, 16, and greater than 23 kilobases were purified from a single clone of Thiobacillus ferrooxidans ATCC 33020 grown in the presence of uranium. The 6.7-kilobase plasmid (pTf1) was cloned separately into the HindIII or BamHI site of Escherichia coli plasmid pBR322. Restriction maps of the recombinant plasmids, termed pTf100 and pTf110, respectively, were constructed, creating potential cloning vehicles for exchanging genetic information between E. coli and T. ferrooxidans. Evidence from restriction enzyme analysis and Southern blot DNA-DNA hybridization indicates that the three native plasmids share little sequence homology.
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