Three clustered origins of replication in a promiscuous-plasmid replicon and their differential use in a PolA+ strain and a delta PolA strain of Escherichia coli K-12

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Abstract
A 1,197-bp region of the broad-host-range plasmid pCU1 is adequate for its replication. Analysis of replicating molecules containing this region reveals three clustered origins of vegetative replication and replication proceeds bidirectionally from each in a theta mode. In an Escherichia coli polymerase I deletion mutant, utilization of one of these three origins was not detected. The potentiality for origin utilization may therefore be a determinant of replicon host range.