Generation of small plasmids from colicin E1 factor carrying genes for galactose utilization and ampicillin resistance,. |
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Authors: | K Shimada T Nakamura S Maeda Y Takagi |
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Affiliation: | Department of Biochemistry, Kyushu University School of Medicine, Fukuoka 812, Japan |
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Abstract: | Ampicillin-resistant colonies that did not utilize galactose appeared sporadically in cultures of galactose genedeleted K-12 cells containing colicin E1 factor carrying genes for galactose utilization and ampicillin resistance. Most of these colonies contained small plasmid DNAs. These plasmids existed as monomer DNAs within K-12 cells and formed a series of covalently closed circular DNA molecules ranging in size from 6.3 × 106 to 15.1 × 106 daltons. The use of these plasmid DNAs was discussed. |
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