Salmonella typhimurium LT2 mutation affecting the deletion of resistance determinants on R plasmids.

Journal of Bacteriology
H WatanabeS Mitsuhashi

Abstract

Plasmid Rms312, specifying resistance to tetracycline (Tc), chloramphenicol (Cm), streptomycin (Sm), sulfonamide (Su), and mercury chloride (Mer), deletes both Tc and Cm Sm Su Mer determinants at a high frequency in Salmonella typhimurium LT2. S. typhimurium mutants that were stable carriers of Rms312 were isolated by alternate culture of R-bearing cells in a medium containing either tetracycline or chloramphenicol. In one of these mutants the deletion frequency of drug resistance determinants was decreased by about 100-fold not only Rms312, but also in R100, R1, and R6-5. This mutation caused a slight reduction of ultraviolet resistance but did not affect generalized genetic recombination, indicating that the mutation is different from recA. The mutation, designated dor (deletion of r-determinants), was mapped to a position near 57 units in the new linkage map of S. typhimurijm LT2 (K. E. Sanderson and P. E. Hartman, Microbiol. Rev. 42:471-519, 1978). The dor mutation had no effect on IS1-mediated illegitimate deletion, indicating that the dor mutation is different from the del mutation described by Nevers and Saedler (P. Nevers and H. Saedler, Mol. Gen. Genet. 160:209-214, 1978).

References

Jan 17, 1978·Molecular & General Genetics : MGG·T MikiR H Rownd
Feb 16, 1978·Molecular & General Genetics : MGG·E OhtsuboJ Rosen
Jun 1, 1978·Microbiological Reviews·K E Sanderson, P E Hartman
Jan 1, 1976·Annual Review of Microbiology·K E Sanderson
Jan 1, 1975·Molecular & General Genetics : MGG·H J Reif, H Saedler
Jan 1, 1972·Biochimie·P Starlinger, H Saedler
Dec 1, 1972·Bacteriological Reviews·K E SandersonP H Mäkelä
Jul 1, 1966·Genetics·M DemerecP E Hartman
Jul 1, 1950·Journal of Bacteriology·B D DAVIS, E S MINGIOLI
Jan 1, 1960·Proceedings of the National Academy of Sciences of the United States of America·Y Hirota

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Citations

Sep 1, 1983·Microbiological Reviews·K E Sanderson, J R Roth

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