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Transfer of plasmid RP4 to Myxococcus xanthus and evidence for its integration into the chromosome.

ABSTRACT

The broad-host-range plasmid RP4 and its derivative R68.45 were transferred to Myxococcus xanthus DK101 and DZ1; RP4 was maintained integrated in the chromosome. Loss of plasmid markers occurred during the growth of the transconjugants, which could be prevented by selective pressure with oxytetracycline. The integrated plasmid was transferred back to Escherichia coli often as RP4-prime plasmids carrying various segments of the M. xanthus chromosome. It also mediated chromosomal transfer between M. xanthus strains.

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