Abstract
SalI restriction endonuclease maps of FII incompatibility group R plasmids NR1, NR84, and R6 have been determined by sequential digestion of plasmid DNA with EcoRI and SalI and subsequent analysis of the fragments by electrophoresis on agarose gels. In the composite R plasmid NR1 there are five SalI sites, one in the r-determinants component and four in the RTF-Tc component. SalI cleavage of transitioned NR1 DNA, which contains tandem sequences of the r-determinants in a head-to-tail orientation, produces the five original bands plus a single new amplified band whose mobility on agarose gels corresponds to the monomer r-determinants DNA. NR84 has a total of four SalI sites. It is missing one of the SalI sites near the repA locus. R6 has five SalI sites, four the same as those of NR84, and one additional site within the Km transposon Tn601.
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