1887

Abstract

A number of enhanced chromosome mobilizing (ECM) plasmids derived from the wide host range plasmid R68 have been used to construct R-prime plasmids carrying a maximum of two map minutes of the PPN chromosome, using PAO as the recipient. For one ECM plasmid, pMO61, the ability to form R-primes did not correlate with the ability to mobilize chromosomes in intrastrain crosses, suggesting that different mechanisms are involved. Physical analysis of one R-prime showed that 3·5 kb of chromosomal DNA had been inserted between the tandem IS sequences carried by the parent ECM plasmid.

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1987-03-01
2021-08-06
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