Abstract
A multiple antibiotic-resistant Staphylococcus aureus, was found to possess three plasmid bands in agarose gel electrophoresis. A plasmid of approximately 4.3 kb (pMC790/2) was found to code for ampicillin and tetracycline resistance and to have one EcoRI site when transformed into S. aureus RN 4220. pMC790/2 in unmodified form was transformed into a recA- E. coli at a frequency of 1.2 x 10(4) transformants/micrograms of plasmid DNA. Plasmid (pMC790/2) replicated, maintained itself stably and expressed far better in the E. coli host than in S. aureus.
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