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Nucleotide sequence, structural organization, and functional characterization of the small recombinant plasmid pOM1 that is specific for Francisella tularensis.

pOM1 is a recombinant 4442-bp plasmid that includes the replicon of the Francisella novicida-like strain F6168 cryptic plasmid pFNL10 and the tetracycline resistance gene (tetC) of plasmid pBR328. pOM1 can stably replicate and is maintained in Francisella tularensis biovars tularensis, palaearctica, and palaearctica var. japonica. The replicon of pOM1 includes the ori region and the repA gene. The ori region, located upstream of the repA gene includes two sets of 31- and 13-bp direct repeats (DR), with AT-rich regions preceding each of the DRs. Two putative promoters of the repA gene were found connected with the DR regions. A 40-kDa protein was encoded by the repA gene and found essential for replication. Expression of the tetC gene is regulated by an Escherichia coli sigma(70)-like promoter and is dependent on the F. tularensis strain and its environment.