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Physiological and genetical studies on a mutant of Salmonella typhimurium which is temperature-sensitive for DNA synthesis

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Summary

The following evidence supports the view that a temperature-sensitive mutant of Salmonella typhimurium (11 G) is defective in DNA synthesis initiation: a) the increment in DNA synthesis at 38° is abolished by prior completion of rounds of replication at 25°. b) The extent of the increment at 38° is greatly increased by prior growth in the presence of a DNA synthesis inhibitor. c) Density gradient centrifugation demonstrates that the terminal region of the chromosomes is preferentially replicated at 38°. d) Preferential replication of the chromosome origins occurs at 25° after a period at 38°. The parental strain in the presence of a DNA synthesis inhibitor or the mutant at 38° (without inhibitor) show increased sensitivity to the detergent sodium deoxycholate, possibly due to a secondary effect of DNA synthesis inhibition on membrane composition. Strains of 11 G carrying episomes transfer the episomes very poorly at 38° suggesting a rôle for the chromosomal initiation apparatus in episome transfer. Continued cell division of 11 G with the production of DNA-less cells at 38° is not due to the presence of a rec mutation and no secondary mutation responsible for such division has been found. The lesion maps close to leu on the Salmonella chromosome.

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  1. Department of Botany and Microbiology, University College London, Gower Street, W.C.1, London

    B. G. Spratt & R. J. Rowbury

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  1. B. G. Spratt
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  2. R. J. Rowbury
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Communicated by R. Pritchard

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Spratt, B.G., Rowbury, R.J. Physiological and genetical studies on a mutant of Salmonella typhimurium which is temperature-sensitive for DNA synthesis. Molec. Gen. Genet. 114, 35–49 (1972). https://doi.org/10.1007/BF00268745

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  • DOI: https://doi.org/10.1007/BF00268745

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