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A DNA fragment carrying genes encoding the conjugal transfer system of the broad host range plasmid RK2 was inserted into a plasmid carrying the chromosomal origin of replication (oriC) from Klebsiella pneumoniae. The resulting plasmid, pEON1, was readily transferred between gram-negative bacteria and carried two potential origins of replication: oriC and the replication origin from pBR322 (oriPBR). Although pEON1 could be transferred to Caulobacter crescentus, Pseudomonas putida, and Rhodobacter sphaeroides, pEON1 was not maintained in these strains. However, an oriC-containing plasmid was maintained in these nonenteric bacteria when an RK2 origin of replication was present on the plasmid. Thus, the inability of pEON1 to be established in a nonenteric bacterium represents a failure of oriC to function as an origin of replication rather than a toxic effect of oriC. The initiation potential of the chromosomal origin of replication from K. pneumoniae appears to be realized only in enteric bacteria.

Klebsiella pneumoniae origin of replication (oriC) is not active in Caulobacter crescentus, Pseudomonas putida, and Rhodobacter sphaeroides