Abstract
We have developed a simple system to clone indigenous Rhizobium plasmids into E. coli. The strategy consists of three matings: the first is to insert Tn5 in the plasmid to be cloned, the second incorporates the integrative vector into the inserted Tn5 in the native Rhizobium plasmid, and the last mating transfers the target plasmid directly into E. coli. This mating-based system was successfully used to clone plasmids of Rhizobium species with sizes ranging from 150 to 270 kb. In addition, a 500-kb fragment of a 600-kb megaplasmid was also cloned. This strategy could be used for cloning indigenous replicons of other gram-negative bacteria into a different host.
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