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The RP4::mini-Mu plasmid pULB113, transferred from Escherichia coli strain MXR, was stable and transfer proficient in Erwinia amylovora strain EA303, E. carotovora subsp. atroseptica strain ECA12, E. carotovora subsp. carotovora strain ECC193, and E. chrysanthemi strain EC183. The plasmid mobilized an array of Erwinia sp. chromosomal markers (E. amylovora: his+,ilv+,rbs+,ser+,thr+;E. chrysanthemi:arg+,his+,ilv+,leu+; E. carotovora subsp. atroseptica: arg+,gua+,leu+,lys+,pur+,trp+; E. carotovora subsp. carotovora: arg+,gua+,leu+,lys+,out+[export of enzymes],pur+,trp+), suggesting random interactions of the plasmid with the chromosomes. In E. carotovora subsp. carotovora, pULB113-mediated two-factor crosses revealed linkage between three auxotrophic markers and the out loci. The export of pectate lyase, polygalacturonase, and cellulase and the maceration of potato tuber tissue occurred with Out+, but not Out-, strains of E. carotovora subsp. carotovora, indicating the importance of enzyme export in plant tissue maceration. Erwinia sp. donors harboring pULB113 complemented mutations in various biosynthetic and catabolic genes (arg, gal, his, leu, met, pro, pur, thy) in Escherichia coli recA strains. Escherichia coli transconjugants harbored pULB113 primes as indicated by the cotransfer of Erwinia genes and pULB113 markers and a change in plasmid mass. Moreover, the PstI and SmaI cleavage patterns of selected pULB113 primes were different from those of pULB113. pULB113 primes carried DNA insertions ranging from 3 to about 160 kilobases. These findings indicate that pULB113 is useful for in vivo gene cloning and genetic analysis of various enterobacterial phytopathogens.

applied and environmental microbiology

pULB113, an RP4::mini-Mu plasmid, mediates chromosomal mobilization and R-prime formation in Erwinia amylovora, Erwinia chrysanthemi, and subspecies of Erwinia carotovora