Abstract
Three indigenous plasmids designated pRK1, pRK2 and pRK3 were identified among producers of penicillin G acylase, (PGA) derived from the strainEscherichia coli W ATCC 9637. Their size and copy number (CN) inE. coli W were determined (kb; CN); pRK1 (80; 3.4), pRK2 (5.1; 71), and pRK3 (4.8; 13.7). StrainE. coli RE2 harboring these plasmids was used for selection of strains with reduced number of plasmids: the strain RE3 without plasmid pRK1 and the plasmid-less strain cERE3 were isolated. Indigenous plasmids did not code for the resistance determinants against 23 antibiotics and 10 heavy metals.
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Sobotková, L., Grafková, J., Štěpánek, V. et al. Indigenous plasmids in a production line of strains for penicillin G acylase derived fromEscherichia coli W. Folia Microbiol 44, 263–266 (1999). https://doi.org/10.1007/BF02818544
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DOI: https://doi.org/10.1007/BF02818544