Abstract
Twenty tellurite resistance (Te R) plasmids of IncHI2, IncHI3, and IncHI1 groups isolated from Enterobacteriaceae hybridized with the pMJ606 (IncHI2) Te R probe, whereas the promiscuous Pseudomonas IncPα plasmids hybridized with only the IncPα Te R probe (pDT1555). Neither of the Te R probes hybridized with the IncP2 Pseudomonas plasmids, which also specify Te R. None of the plasmids hybridized with pUM3, a plasmid carrying the arsABC genes that encodes resistance to arsenite, arsenate, antimony, and moderate levels of tellurite. These results show that the IncHI2 Te R determinant is widespread in the Enterobacteriaceae and support the hypothesis that there are at least five distinct Te R determinants: (1) the telAB genes from the Escherichia coli chromosome: (2) IncHI2: (3) IncP2: (4) arsABC; and (5) the Te R determinants of IncPα plasmids.
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