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Effect of ruv mutations on recombination and DNA repair in Escherichia coli K12

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Summary

Mutation of the ruv gene of E. coli is associated with sensitivity to radiation, and filamentous growth after transient inhibition of DNA synthesis. The filamentation of ruv strains is abolished by mutations in sfiA or sfiB that prevent SOS induced inhibition of cell division, but this does not restore resistance to UV radiation. Double mutants carrying both ruv and uvr mutations are considerably more sensitive to UV radiation than the single mutants, but there is no additive effect of ruv with recA, recF, recB, or recC mutations. ruv mutations have little effect on conjugal recombination in wild-type strains but confer recombination deficiency and extreme sensitivity to ionizing radiation in recBC sbcB strain. These results, together with the fact that ruv strains are excision proficient and mutable by UV light, are interpreted to suggest that the ruv + product is involved in recombinational repair of damaged DNA rather than in cell division as suggested by Otsuji et al. (1974).

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Authors and Affiliations

  1. Genetics Department, University of Nottingham, University Park, NG7 2RD, Nottingham, England

    Robert G. Lloyd, Fiona E. Benson & Claire E. Shurvinton

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  1. Robert G. Lloyd
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  2. Fiona E. Benson
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  3. Claire E. Shurvinton
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Communicated by P.T. Emmerson

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Lloyd, R.G., Benson, F.E. & Shurvinton, C.E. Effect of ruv mutations on recombination and DNA repair in Escherichia coli K12. Molec. Gen. Genet. 194, 303–309 (1984). https://doi.org/10.1007/BF00383532

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  • DOI: https://doi.org/10.1007/BF00383532

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