Isolation of minicircular deoxyribonucleic acids from wild strains of Escherichia coli and their relationship to other bacterial plasmids - PubMed (original) (raw)
Isolation of minicircular deoxyribonucleic acids from wild strains of Escherichia coli and their relationship to other bacterial plasmids
W Goebel et al. J Bacteriol. 1972 Sep.
Abstract
Supercoiled minicircular deoxyribonucleic acid (DNA) molecules with molecular weights of 1.8 x 10(6) and 2.3 x 10(6) have been isolated from two wild strains of Escherichia coli. DNA-DNA hybridization experiments indicate that these DNA molecules share extended homologies with the minicircular DNA of E. coli 15. The DNA of the colicinogenic factor E1 (ColE1) also hybridizes to a large extent with minicircular DNA of E. coli 15. In contrast, no hybridization could be detected with various large extrachromosomal DNA elements such as the colicinogenic factor V (ColV), the beta-hemolytic factor (Hly), or the P1-like DNA of E. coli 15. Two different insertion DNA species of E. coli integrated into lambdadg-DNA (lambdadg UP(in) 128, lambdadg UP(in) 308) do not show any annealing with minicircular DNA of E. coli 15.
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