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The chromosomal DNA replication origin (oriC) of the plant pathogen Erwinia carotovora has been isolated and sequenced. The minimal E. carotovora oriC regional functional in Escherichia coli is a 374 base pair region located on a 7.9 kilobase pair SalI fragment which also contains a functional asnA gene. Differences between the nucleotide sequence of the minimal origin regions of E. carotovora and those of E. coli and Salmonella typhimurium are clustered nucleotide substitutions, with regions of complete homology, up to 19 base pairs long, between the three origins. Nine GATC sites are found in the minimal origin, and all are conserved. In contrast, the region toward asnA from the minimal origin shows little clustering and the differences occur mainly every third nucleotide, suggesting that this region is a protein coding region.

The chromosomal origin of replication(oriC)ofErwinia carotovora